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                                                                Exhibit 10.73

                                 LOAN AGREEMENT

                     AMONG WESTERN PCS HOLDING CORPORATION;

           THE FINANCIAL INSTITUTIONS WHOSE NAMES APPEAR AS LENDERS ON
                           THE SIGNATURE PAGES HEREOF;

                            TD SECURITIES (USA) INC.,
                     NATIONSBANC MONTGOMERY SECURITIES LLC,
                  BARCLAYS CAPITAL, J.P. MORGAN SECURITIES INC.
                           AND CHASE SECURITIES INC.,
                              AS ARRANGING AGENTS;

                           J.P. MORGAN SECURITIES INC.
                             AS DOCUMENTATION AGENT;

                      NATIONSBANC MONTGOMERY SECURITIES LLC
                           AND CHASE SECURITIES INC.,
                          AS CO-SYNDICATION AGENTS; AND

                       TORONTO DOMINION (TEXAS), INC., AS
                              ADMINISTRATIVE AGENT.

                                   DATED AS OF

                                  JUNE 26, 1998


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                                 LOAN AGREEMENT

              AMONG WESTERN PCS HOLDING CORPORATION; THE FINANCIAL
           INSTITUTIONS WHOSE NAMES APPEAR AS LENDERS ON THE SIGNATURE
               PAGES HEREOF; TD SECURITIES (USA) INC., NATIONSBANC
            MONTGOMERY SECURITIES LLC, BARCLAYS CAPITAL, J.P. MORGAN
            SECURITIES INC., AND CHASE SECURITIES INC., AS ARRANGING
                 AGENTS; AND TORONTO DOMINION (TEXAS), INC., AS
                              ADMINISTRATIVE AGENT



          The parties to this Agreement agree as follows, as of the 26th day of
June, 1998:

                                    ARTICLE 1

                                   Definitions

          For the purposes of this Agreement:

          "Acquisition" shall mean (whether by purchase, exchange, issuance of
stock or other equity or debt securities, merger, reorganization or any other
method) (i) any acquisition by the Borrower or any of its Subsidiaries of any
other Person, which Person shall then become consolidated with the Borrower or
any such Subsidiary in accordance with GAAP, or (ii) any acquisition by the
Borrower or any of its Subsidiaries of all or any substantial amount of the
assets of any other Person. For purposes of the preceding sentence, an amount of
assets shall be deemed to be "substantial" if such assets have a fair market
value in excess of $1,000,000; provided, however, that the purchase of equipment
and other goods and services in the ordinary course of business shall not be
deemed to be "Acquisitions."

          "Additional Contributed Capital" shall mean the sum of amounts
Invested in the Borrower or its Restricted Subsidiaries by VoiceStream after the
Agreement Date as a result of (i) Investments by the Parent into VoiceStream,
(ii) Investments by Hutchison (in addition to the Initial Hutchison Investment)
into VoiceStream, (iii) the incurrence by VoiceStream of Indebtedness for Money
Borrowed (excluding deferred interest on such Indebtedness for Money Borrowed),
and (iv) the issuance for cash of any additional equity securities by
VoiceStream.


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          "Additional Facility Indebtedness" shall mean additional Indebtedness
for Money Borrowed (as to which no commitment has been issued by any Lender as
of the Agreement Date) in a principal amount not to exceed $200,000,000 incurred
by the Borrower in accordance with Section 2.1(d) of this Agreement.

          "Administrative Agent" shall mean Toronto Dominion (Texas), Inc., as
Administrative Agent for the Lenders, together with any successor Administrative
Agent hereunder.

          "Administrative Agent's Office" shall mean the office of Toronto
Dominion (Texas), Inc., as Administrative Agent hereunder, located at 909 Fannin
Street, Suite 1700, Houston, Texas 77010, or such other office as may be
designated pursuant to the provisions of Section 11.1 of this Agreement.

          "Advance" shall mean the aggregate amount advanced by the Lenders to
the Borrower pursuant to Article 2 hereof on the occasion of any borrowing.

          "Affiliate" shall mean, with respect to a Person, any other Person
directly or indirectly controlling, controlled by, or under common control with,
such first Person. For purposes of this definition, "control" when used with
respect to any Person includes, without limitation, the direct or indirect
beneficial ownership of more than ten percent (10%) of the voting securities or
voting equity of such Person, or the power to direct or cause the direction of
the management and policies of such Person whether by contract or otherwise.
Unless otherwise specified, "Affiliate" shall mean an Affiliate of the Borrower,
and shall include the Unrestricted Subsidiaries.

          "Agreement" shall mean this Loan Agreement.

          "Agreement Date" shall mean the date as of which this Agreement is
dated.

          "Allowable Wireless System" shall mean any PCS System located within
the United States of America, including its dependencies and possessions.

          "Annualized Operating Cash Flow" shall mean, as of any calculation
date, Operating Cash Flow for the most recently-completed fiscal two-quarter
period multiplied by two (2).

          "Annualized Revenues" shall mean, as of any calculation date,
(i) total revenues of the Borrower and its Restricted


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Subsidiaries on a consolidated basis for the most recently completed fiscal
two-quarter period, multiplied by (ii) two (2).

          "Applicable Law" shall mean, in respect of any Person, all provisions
of constitutions, statutes, rules, regulations and orders of governmental bodies
or regulatory agencies applicable to such Person, including, without limiting
the foregoing, the Licenses, the Communications Act and all Environmental Laws,
and all orders, decisions, judgments and decrees of all courts and arbitrators
in proceedings or actions to which the Person in question is a party or by which
it is bound.

          "Applicable Margin" shall mean the interest rate margin applicable to
Advances hereunder as determined in accordance with Section 2.3(f) hereof.

          "Arranging Agents" shall mean TD Securities (USA) Inc., Barclays
Capital, Chase Securities Inc., J.P. Morgan Securities Inc., and NationsBanc
Montgomery Securities LLC, as arranging agents for the Lenders hereunder.

          "Approved Fund" means, with respect to any Lender that is a fund that
invests in commercial loans, any other fund that invests in commercial loans and
is managed or advised by the same investment advisor as such Lender or by an
Affiliate of such investment advisor.

          "Authorized Signatory" shall mean such senior officers of the Borrower
as may be duly authorized and designated in writing by the Borrower to execute
documents, agreements and instruments on behalf of the Borrower.

          "Available Equity" shall mean cash proceeds from public or private
offerings of the capital stock of the Borrower or its Restricted Subsidiaries
issued after the Agreement Date, or cash Invested as equity into the Borrower or
its Restricted Subsidiaries by VoiceStream or the Parent after the Agreement
Date, in either case in excess of the sum of (i) Contributed Capital as of the
Agreement Date, plus (ii) the Minimum Additional Contributed Capital.

          "Base Rate" shall mean, at any time, the higher of (a) the rate of
interest adopted by the Administrative Agent as the reference rate for the
determination of interest rates for loans of varying maturities in Dollars to
United States residents of varying degrees of creditworthiness and being quoted
at such time by The Toronto-Dominion Bank, New York Branch as its "base rate" or
"prime rate," or (b) the


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Federal Funds Rate plus five-eighths of one percent (5/8%). The Base Rate is not
necessarily the lowest rate of interest charged to borrowers of the
Administrative Agent or its Affiliates.

          "Base Rate Advance" shall mean an Advance which the Borrower requests
to be made as a Base Rate Advance or is reborrowed as a Base Rate Advance, and
which bears interest at the Base Rate Basis, in accordance with the provisions
of Section 2.2 hereof, and which shall be in a principal amount of at least
$5,000,000 and in an integral multiple of $1,000,000.

          "Base Rate Basis" shall mean a simple interest rate equal to the sum
of (i) the Base Rate and (ii) the Applicable Margin. The Base Rate Basis shall
be adjusted automatically as of the opening of business on the effective date of
each change in the Base Rate to account for such change and shall also be
changed to reflect adjustments in the Applicable Margin.

          "Basket" shall mean $25,000,000, and shall be the limitation at all
times on the aggregate dollar amount of Specified Transactions outstanding or in
effect at any time, entered into by the Borrower or any of its Restricted
Subsidiaries.

          "Borrower" shall mean Western PCS Holding Corporation,
a Delaware corporation.

          "Borrower's Pledge Agreement" shall mean that certain Borrower's
Pledge Agreement of even date between the Borrower and the Administrative Agent,
substantially in the form of Exhibit A attached hereto, pursuant to which the
Borrower has pledged to the Administrative Agent as Collateral for the
Obligations all stock owned by it.

          "BTA" shall mean the unit of division (of which there are 493) for the
United States of America, devised by Rand McNally based upon geography,
population and other factors, which units form the basis for the auction by the
FCC of a portion of the Licenses for PCS Systems for Basic Trading Areas, as
defined by the FCC.

          "Business Day" shall mean a day on which banks and foreign exchange
markets are open for the transaction of business required for this Agreement in
London, Houston, and New York, as relevant to the determination to be made or
the action to be taken.



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          "Capital Expenditures" shall mean, in respect of any Person,
expenditures for the purchase of tangible assets for long-term use which are
capitalized in accordance with GAAP.

          "Capitalized Lease Obligation" shall mean that portion of any
obligation of a Person as lessee under a lease which is required to be
capitalized on the balance sheet of such lessee in accordance with GAAP.

          "Cash Interest Expense" shall mean, for any period, for the Borrower
and its Restricted Subsidiaries, on a consolidated basis, cash interest paid or
accrued (but not deferred) in respect of Total Debt, together with fees
associated therewith (other than fees payable on or prior to the Agreement
Date), and including amounts distributed by the Borrower as Restricted Payments
pursuant to Section 7.7(a) hereof to the extent such amounts are used for cash
interest on Subordinated Debt, all as determined in accordance with GAAP and
shall also include the interest component of payments for such period in respect
of Capitalized Lease Obligations.

          "Certificate of Financial Condition" shall mean a certificate,
substantially in the form of Exhibit B attached hereto, signed by the chief
financial officer of the Borrower, together with any schedules, exhibits or
annexes appended thereto.

          "Change of Control" shall mean (i) the Borrower shall cease to be the
direct, wholly-owned subsidiary of VoiceStream,(ii) any "person" or "group" (as
such terms are used for purposes of Sections 13(d) and 14(d) of the Exchange
Act, whether or not applicable), other than the shareholders of VoiceStream, or
shareholders holding four percent (4%) or more of the common stock of the
Parent, in either case as of the Agreement Date (or any Person or group of
Persons that, as of the Agreement Date, are Affiliates of such shareholders), is
or becomes the "beneficial owner" (as that term is used in Rules 13d-3 and 13d-5
under the Exchange Act, whether or not applicable, except that a Person shall be
deemed to have "beneficial ownership" of all shares that any such Person has the
right to acquire, whether such right is exercisable immediately or only after
the passage of time), directly or indirectly, of more than 20% of the aggregate
number of votes of all classes of capital stock of VoiceStream which ordinarily
have voting power for the election of directors of VoiceStream, or (iii) during
any period of twenty-four (24) consecutive months, individuals who at the
beginning of such period constituted the board of directors of VoiceStream,
together with any new


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directors whose election by such board or whose nomination for election by the
shareholders of VoiceStream was approved by a vote of a majority of the
directors then still in office who were either directors at the beginning of
such period or whose election or nomination for election was previously so
approved, cease for any reason to constitute a majority of the board of
directors of VoiceStream then in office.

          "Co-Agents" shall mean The Bank of New York, The Bank of Nova Scotia,
PNC Bank National Association, Banque Paribas, and Cooperatieve Centrale
Raiffeisen-Boerenleenbank B.A., "Rabobank Nederland," New York Branch; and
"Co-Agent" shall mean any one of the foregoing Co-Agents.

          "Code" shall mean the Internal Revenue Code of 1986, as amended from
time to time.

          "Collateral" shall mean any property of any kind provided as
collateral for the Obligations under any of the Security Documents.

          "Commitment Ratios" shall mean the percentages in which the Lenders
are severally bound from time to time (giving effect to assignments made as
permitted under Section 11.5(b) hereof) to make Advances to the Borrower under
the Commitments, which percentages are set forth (together with dollar amounts)
for each Lender for its Commitments as of the Agreement Date on Schedule 1
attached hereto.

          "Commitments" shall mean the Revolving Loan Commitment, the Tranche A
Term Loan Commitment, and the Tranche B Term Loan Commitment.

          "Communications Act" shall mean the Communications Act of 1934, and
any similar or successor federal statute, and the rules and regulations of the
FCC thereunder, all as amended and as the same may be in effect from time to
time.

          "Contributed Capital" shall mean the principal amount of Loans
outstanding hereunder, plus the sum of amounts Invested in the Borrower or its
Restricted Subsidiaries by VoiceStream as a result of (i) Investments by the
Parent into VoiceStream on or prior to the Agreement Date, (ii) the Initial
Hutchison Investment, (iii) the incurrence by VoiceStream after the Agreement
Date of Total Debt (excluding deferred interest on such Indebtedness for Money
Borrowed), and (iv) the issuance of equity securities by VoiceStream.



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          "Core Properties" shall mean any PCS System or Investment therein
directly owned by the Borrower or any of its Restricted Subsidiaries, which is
proposed to be sold, assigned or otherwise transferred, in a transaction or
series of transactions in which such PCS System or Investment therein would
generate Net Proceeds in excess of $10,000,000. As of the Agreement Date, the
"Core Properties" are the PCS Systems owned and operated (or, in the case of
Seattle, Washington and Phoenix/Tucson, Arizona, under construction) by the
Borrower and its Restricted Subsidiaries pursuant to MTA Licenses for Salt Lake
City; Honolulu; El Paso; Albuquerque; Denver; Portland; Oklahoma City; and the
retained portion of Des Moines; and pursuant to BTA Licenses for Seattle-Tacoma
and Olympia-Centralia, Washington; and Phoenix and Tucson, Arizona.

          "Debt Service" shall mean, for any period, the amount of Cash Interest
Expense, together with scheduled principal repayments (excluding any repayments
made or required to be made in accordance with Section 2.8 hereof) in respect of
Indebtedness for Money Borrowed, of the Borrower and its Restricted Subsidiaries
on a consolidated basis, together with any Restricted Payments made as permitted
under Section 7.7 hereof and used to pay interest on Subordinated Debt. For
purposes of this definition, 'principal' shall include the principal component
of payments for such period in respect of Capitalized Lease Obligations.

          "Default" shall mean any Event of Default, and any of the events
specified in Section 8.1, regardless of whether there shall have occurred any
passage of time or giving of notice, or both, that would be necessary in order
to constitute such event an Event of Default.

          "Default Rate" shall mean a simple per annum interest rate equal to
the sum of the otherwise applicable Interest Rate Basis plus two percent (2%).
With respect to amounts (other than principal) bearing interest at the Default
Rate, for purposes of the foregoing sentence, the words "otherwise applicable
Interest Rate Basis," shall be deemed to mean the Base Rate Basis.

          "Dollars" or "$" shall mean the basic unit of the lawful currency of
the United States of America.

          "Environmental Laws" shall mean, with respect to any Person, all
applicable federal, state and local laws, statutes, rules, regulations and
ordinances, codes, common law, consent agreements to which such Person is a
party or by which it is bound, orders, decrees, judgments and


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injunctions issued, promulgated, approved or entered thereunder affecting such
Person or its property and relating to public health, safety or the pollution or
protection of the environment, including, without limitation, those relating to
releases, discharges, emissions, spills, leaching, or disposals to, on, or in
air, water, land or ground water, to the withdrawal or use of ground water, to
the use, handling or disposal of polychlorinated biphenyls, asbestos or urea
formaldehyde, to the treatment, storage, disposal or management of hazardous
substances (including, without limitation, petroleum, crude oil or any fraction
thereof, or other hydrocarbons), pollutants or contaminants, to exposure to
toxic, hazardous or other controlled, prohibited, or regulated substances,
including, without limitation, any such provisions under the Comprehensive
Environmental Response, Compensation and Liability Act of 1980, as amended (42
U.S.C. Section 9601 et seq.), or the Resource Conservation and Recovery Act of
1976, as amended (42 U.S.C. Section 6901 et seq.).

          "ERISA" shall mean the Employee Retirement Income Security Act of
1974, as in effect from time to time.

          "ERISA Affiliate" shall mean any Person, including a Subsidiary or an
Affiliate of the Borrower, that is a member of any group of organizations
(within the meaning of Code Sections 414(b), 414(c), 414(m), or 414(o)) of which
the Borrower is a member.

          "Eurodollar Advance" shall mean an Advance which the Borrower requests
to be made as a Eurodollar Advance or which is reborrowed as a Eurodollar
Advance, and which bears interest at the Eurodollar Basis, in accordance with
the provisions of Section 2.2 hereof, and which shall be in a principal amount
of at least $5,000,000 and in an integral multiple of $1,000,000.

          "Eurodollar Basis" shall mean a simple per annum interest rate
(rounded upward, if necessary, to the nearest one-hundredth (1/100th) of one
percent) equal to the sum of (a) the quotient of (i) the Eurodollar Rate divided
by (ii) one minus the Eurodollar Reserve Percentage, stated as a decimal, plus
(b) the Applicable Margin. The Eurodollar Basis shall apply to Interest Periods
of one (1), two (2), three (3), six (6), and, subject to availability, twelve
(12) months, and, once determined, shall remain unchanged during the applicable
Interest Period, except for changes to reflect adjustments in the Eurodollar
Reserve Percentage and the Applicable Margin pursuant to Section 2.3(f) hereof.
The Borrower may elect an Interest Period of twelve (12)


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months for a Eurodollar Advance unless the Administrative Agent has been
notified by at least one Lender that (i) such Lender does not have available to
it funds for its portion of the proposed Advance which are not required for
other purposes, or (ii) such funds are not available to such Lender at a rate at
or below the Eurodollar Rate for such proposed Advance and Interest Period.

          "Eurodollar Rate" shall mean, for any Interest Period, the average of
the interest rates per annum (rounded upward to the nearest one-sixteenth of one
percent (1/16%)) which appear on Telerate Page 3750 as of 11:00 a.m. (London
time), or, if unavailable, any generally accepted successor rate selected by the
Administrative Agent, two (2) Business Days before the first day of such
Interest Period, in an amount approximately equal to the principal amount of,
and for a length of time approximately equal to the Interest Period for, the
Eurodollar Advance sought by the Borrower.

          "Eurodollar Reserve Percentage" shall mean the percentage which is in
effect from time to time under Regulation D of the Board of Governors of the
Federal Reserve System, as such regulation may be amended from time to time, as
the maximum reserve requirement applicable with respect to Eurocurrency
liabilities (as that term is defined in Regulation D), whether or not any Lender
has any such Eurocurrency liabilities subject to such reserve requirement at
that time. The Eurodollar Basis for any Eurodollar Advance shall be adjusted as
of the effective date of any change in the Eurodollar Reserve Percentage.

          "Event of Default" shall mean any of the events specified in Section
8.1, provided that any requirement for notice or lapse of time or both has been
satisfied.

          "Excess Cash Flow" shall mean, with respect to the Borrower and its
Restricted Subsidiaries on a consolidated basis, as of the end of any fiscal
year of the Borrower and based on the audited financial statements required to
be provided under Section 6.2 hereof, the remainder of (a) Operating Cash Flow
for such fiscal year minus (b) the sum of the following items for such fiscal
year multiplied by 1.10 (provided that the use of such multiplication factor
shall not increase the sum of the items listed below for any fiscal year by more
than $10,000,000): (i) Capital Expenditures; (ii) cash income taxes paid; (iii)
Cash Interest Expense; (iv) scheduled principal repayments on any Indebtedness
for Money Borrowed (including the principal component of any Capitalized Lease
Obligation, but not including any repayments required under Section 2.8(a)); and


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(v) permanent, voluntary prepayments of the Loans (accompanied by permanent
reduction in a like amount of the Revolving Loan Commitment, in the case of such
prepayment of the Revolving Loans) hereunder.

          "Exchange Act" shall mean the Securities Exchange Act of 1934, as it
may be amended, and any successor act thereto.

          "FCC" shall mean the Federal Communications Commission, or any other
similar or successor agency of the federal government administering the
Communications Act.

          "Federal Funds Rate" shall mean, as of any date, the weighted average
of the rates on overnight federal funds transactions with the members of the
Federal Reserve System arranged by federal funds brokers, as published for such
day (or, if such day is not a Business Day, for the next preceding Business Day)
by the Federal Reserve Bank of New York, or, if such rate is not so published
for any day which is a Business Day, the average of the quotations for such day
on such transactions received by the Administrative Agent or its Affiliate from
three (3) federal funds brokers of recognized standing selected by the
Administrative Agent or its Affiliate.

          "Fee Letters" shall mean, collectively, those certain agreements dated
as of the Agreement Date setting forth the applicable fees to be paid by the
Borrower to the other parties to this Agreement in connection with the Term
Loans and the Revolving Loan Commitment created hereunder.

          "Final Maturity Date" shall mean the earlier of (a) June 30, 2007 or
(b) such earlier date on which the payment of all outstanding Obligations shall
be due (whether by acceleration or otherwise).

          "Financial Covenants" shall mean from time to time the financial
covenants applicable to the Borrower from time to time as set forth in Sections
7.8 through 7.15 hereof.

          "Fixed Charge Coverage Ratio" shall mean on any calculation date, for
the Borrower and its Restricted Subsidiaries on a consolidated basis, the ratio
of (a) the sum (without double-counting) of (i) Annualized Operating Cash Flow
as of the end of the most recent fiscal quarter, plus (ii) the unused portion of
the Revolving Loan Commitment which is available for borrowing as of the
calculation date without causing a Default hereunder, to (b) Fixed Charges.


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          "Fixed Charges" shall mean on any calculation date, for the Borrower
and its Restricted Subsidiaries on a consolidated basis for the most recently
completed fiscal four-quarter period, the sum of (a) Debt Service, plus (b)
Capital Expenditures, plus (c) cash income taxes paid, plus (d) the amount of
any principal repaid under Section 2.8(a) hereof.

          "GAAP" shall mean generally accepted accounting principles in the
United States, consistently applied.

          "Guaranty" or "Guaranteed," as applied to an obligation, shall mean
and include (a) a guaranty, direct or indirect, in any manner, of all or any
part of such obligation, and (b) any agreement, direct or indirect, contingent
or otherwise, the practical effect of which is to assure in any way the payment
or performance (or payment of damages in the event of non-performance) of all or
any part of such obligation, including, without limiting the foregoing, any
reimbursement obligations with respect to outstanding letters of credit.

          "Hutchison" shall mean Hutchison Telecommunications PCS (USA) Limited,
a British Virgin Islands corporation.

          "Indebtedness" shall mean, with respect to any Person, and without
duplication, (a) all items, except items of partners' equity or capital stock or
surplus or general contingency or deferred tax reserves, which in accordance
with GAAP would be included in determining total liabilities as shown on the
liability side of a balance sheet of such Person, including, without limitation,
secured non-recourse obligations of such Person, (b) all direct or indirect
obligations of any other Person secured by any Lien to which any property or
asset owned by such Person is subject, but only to the extent of the lower of
(i) the face amount of such obligations or (ii) the higher of the fair market
value or the book value of the property or asset subject to such Lien if the
obligation secured thereby shall not have been assumed, (c) all Capitalized
Lease Obligations of such Person and all obligations of such Person with respect
to leases constituting part of a sale and lease-back arrangement, and (d) all
reimbursement obligations with respect to outstanding letters of credit.

          "Indebtedness for Money Borrowed" shall mean, with respect to any
Person, Indebtedness for money borrowed and Indebtedness represented by notes
payable and drafts accepted representing extensions of credit, all obligations
evidenced by bonds, debentures, notes or other similar


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instruments, all Indebtedness upon which interest charges are customarily paid,
all Capitalized Lease Obligations, all reimbursement obligations with respect to
outstanding letters of credit (whether drawn or undrawn), all Indebtedness
issued or assumed as full or partial payment for property or services (other
than trade payables arising in the ordinary course of business, but only if and
so long as such accounts are payable on customary trade terms), whether or not
any such notes, drafts, obligations or Indebtedness represent Indebtedness for
money borrowed, and, without duplication, Guaranties of any of the foregoing.
For purposes of this definition, interest which is accrued but not paid on the
scheduled due date for such interest shall be deemed Indebtedness for Money
Borrowed.

          "Indemnitee" shall have the meaning ascribed to it in
Section 5.11 hereof.

          "Initial Hutchison Investment" shall mean the purchase by Hutchison in
February, 1998 of a 19.9% interest in VoiceStream for a cash purchase price of
$248 million.

          "Interest Hedge Agreements" shall mean any interest rate swap, cap,
collar, floor, caption or swaption agreements, or any similar arrangements
designed to hedge the risk of variable interest rate volatility or to reduce
interest costs, arising at any time between the Borrower, on the one hand, and
any one or more of the Lenders, or any other Person (other than an Affiliate of
the Borrower), on the other hand, as such agreement or arrangement may be
modified, supplemented and in effect from time to time.

          "Interest Period" shall mean (a) in connection with any Base Rate
Advance, the period beginning on the date such Advance is made and ending on the
last Business Day of the calendar quarter in which such Advance is made,
provided, however, that if a Base Rate Advance is made on the last day of any
calendar quarter, it shall have an Interest Period ending on, and its Payment
Date shall be, the last day of the following calendar quarter, and (b) in
connection with any Eurodollar Advance, the term of such Advance selected by the
Borrower or otherwise determined in accordance with this Agreement.
Notwithstanding the foregoing, however, (i) any applicable Interest Period which
would otherwise end on a day which is not a Business Day shall be extended to
the next succeeding Business Day unless, with respect to Eurodollar Advances
only, such Business Day falls in another calendar month, in which case such
Interest Period shall end on the next preceding Business Day, (ii) any
applicable Interest Period, with respect to Eurodollar Advances only,


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which begins on a day for which there is no numerically corresponding day in the
calendar month during which such Interest Period is to end shall (subject to
clause (i) above) end on the last day of such calendar month, and (iii) no
Interest Period shall extend beyond the Revolving Loan Maturity Date with
respect to Interest Periods applicable to Revolving Loans or to Tranche A Term
Loans, the Final Maturity Date with respect to Interest Periods applicable to
Tranche B Term Loans, or such earlier date as would interfere with the
Borrower's repayment obligations hereunder. Interest shall be due and payable
with respect to any Advance as provided in Section 2.3 hereof.

          "Interest Rate Basis" shall mean the Base Rate Basis or the Eurodollar
Basis, as appropriate.

          "Investment" shall mean, with respect to any Person, any loan, advance
or extension of credit (other than to customers in the ordinary course of
business) by such Person to, or any Guaranty or other contingent liability with
respect to the capital stock, Indebtedness or other obligations of, or any
contributions to the capital of, any other Person, or any ownership, purchase or
other acquisition by such Person of any interest in any capital stock, limited
partnership interest, general partnership interest, or other securities of any
such other Person, other than an Acquisition; and "Invest," "Investing" or
"Invested" shall mean the making of an Investment. "Investment" shall also
include the total cost of any future commitment or other obligation binding on
any Person to make an Investment or any subsequent Investment.

          "Lenders" shall mean the financial institutions whose names appear as
"Lenders" on the signature pages hereof and any other Person which becomes a
"Lender" hereunder after the Agreement Date; and "Lender" shall mean any one of
the foregoing Lenders.

          "Leverage Ratio (Senior Debt)" shall mean, as of the end of any fiscal
quarter, the ratio of Senior Debt to Annualized Operating Cash Flow.

          "Leverage Ratio (Total Debt)" shall mean, as of the end of any fiscal
quarter, the ratio of Total Debt to Annualized Operating Cash Flow.

          "Licenses" shall mean any mobile telephone, cellular telephone,
microwave, paging, personal communications service, or other license,
authorization, certificate of compliance, franchise, approval or permit for the


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<PAGE>   15
construction or the operation of any PCS System granted or issued by the FCC and
held by the Borrower or any of its Restricted Subsidiaries, or by any Person in
which the Borrower or any of its Restricted Subsidiaries has an Investment, all
of which are listed as of the Agreement Date on Schedule 2 hereto.

          "Lien" shall mean, with respect to any property, any mortgage, lien,
pledge, negative pledge or other agreement not to pledge, assignment, charge,
security interest, title retention agreement, levy, execution, seizure,
attachment, garnishment or other similar encumbrance of any kind in respect of
such property, whether created by statute, contract, the common law or
otherwise, and whether or not choate, vested or perfected.

          "Loan Documents" shall mean this Agreement, the Notes, the Borrower's
Pledge Agreement, the Security Agreement, the Subsidiary Security Agreement, the
Subsidiary Guaranty, the Subsidiary Pledge Agreement, any Subordination
Agreement, the VoiceStream Guaranty, the VoiceStream Pledge Agreement, all legal
opinions issued by counsel to the Borrower or any of its Restricted
Subsidiaries, any reliance letters issued with respect to legal opinions, the
Fee Letters, all Requests for Advance, all Interest Hedge Agreements between the
Borrower, on the one hand, and the Administrative Agent and the Lenders, or any
of them, or any of their respective Affiliates, on the other hand, including any
Interest Hedge Agreements entered into prior to the Agreement Date, and all
other material documents and agreements executed or delivered in connection with
or contemplated by this Agreement.

          "Loans" shall mean, collectively, the Revolving Loans and the Term
Loans, which are evidenced by the Notes.

          "Majority Lenders" shall mean (i) prior to the occurrence of an Event
of Default and the termination of unfunded Commitments, Lenders the sum of whose
Revolving Loan Commitment amount plus Term Loans outstanding plus undrawn
Tranche A Term Loan Commitment equals or exceeds fifty-one percent (51%) of the
sum of such items, or (ii) at any time that there exists an Event of Default
hereunder, and unfunded Commitments have been terminated, Lenders the total of
whose Loans outstanding equals or exceeds fifty-one percent (51%) of the total
principal amount of the Loans then outstanding hereunder.



                                       14

<PAGE>   16
          "Managing Agents" shall mean The Bank of America NT&SA,
Societe Generale, Credit Lyonnais, General Electric Capital Corporation, and
Goldman Sachs.

          "Materially Adverse Effect" shall mean (i) any material adverse effect
upon the business, assets, liabilities, financial condition, results of
operations, properties, or business prospects of the Borrower and its Restricted
Subsidiaries taken as a whole, or (ii) a material adverse effect upon the
binding nature, validity, or enforceability of this Agreement, and the Notes,
and the other Loan Documents or upon the ability of the Borrower and its
Restricted Subsidiaries to perform the payment obligations or other material
obligations under this Agreement or any other Loan Document, or upon the value
of the Collateral, taken as a whole or upon the rights, benefits or interests of
the Lenders in and to the Loans or the rights of the Administrative Agent and
the Lenders in the Collateral taken as a whole; in either case, whether
resulting from any single act, omission, situation, status, event or
undertaking, or taken together with other such acts, omissions, situations,
statuses, events or undertakings.

          "Minimum Additional Contributed Capital" shall mean $200,000,000 in
Additional Contributed Capital, Invested in the Borrower and its Restricted
Subsidiaries after the Agreement Date.

          "MSA" shall mean any "metropolitan statistical area" as defined and
modified by the FCC for the purpose of licensing public cellular radio
telecommunications service systems.

          "MTA" shall mean any of the 51 "major trading areas" into which the
United States of America is organized, as set forth in the Rand McNally 1992
Commercial Atlas & Marketing Guide, 123d Edition, at pages 38-39.

          "Multiemployer Plan" shall have the meaning set forth in Section
4001(a)(3) of ERISA.

          "Necessary Authorizations" shall mean all approvals and licenses from,
and all filings and registrations with, any governmental or other regulatory
authority, including, without limiting the foregoing, the Licenses and all
grants, approvals, licenses, filings and registrations under the Communications
Act, necessary in order to enable the Borrower or any of its Restricted
Subsidiaries to own, construct, maintain and operate PCS Systems and to make and
hold Investments in other Persons who own, construct, maintain, and operate PCS
Systems.


                                       15

<PAGE>   17
          "Net Income" shall mean, for the Borrower and its Restricted
Subsidiaries on a consolidated basis, for any period, net income determined in
accordance with GAAP.

          "Net Proceeds" shall mean, with respect to any sale, lease, transfer
or other disposition of assets or securities by the Borrower or any of its
Restricted Subsidiaries, the aggregate amount of cash received for such assets
or securities (including, without limitation, any payments received for
non-competition covenants, consulting or management fees, and any portion of the
amount received evidenced by a buyer promissory note or other evidence of
Indebtedness), net of (i) amounts reserved, if any, for taxes payable with
respect to any such sale (after application of any available losses, credits or
other offsets), (ii) reasonable and customary transaction costs properly
attributable to such transaction and payable by the Borrower or any of its
Restricted Subsidiaries (other than to an Affiliate if not on an arms length
basis) in connection with such sale, lease, transfer or other disposition of
assets or securities, and (iii) until actually received by the Borrower or any
of its Restricted Subsidiaries, any portion of the amount received held in
escrow or evidenced by a buyer promissory note, or a non-compete agreement or
covenant, management agreement or consulting agreement, for which compensation
is paid over time. Upon receipt by the Borrower or any of its Restricted
Subsidiaries of amounts referred to in item (iii) of the preceding sentence,
such amounts shall then be deemed to be "Net Proceeds."

          "Net Proceeds Trust" shall have the meaning ascribed to such term in
Section 2.8(b)(ii) hereof.

          "Nortel Debt" shall mean certain Indebtedness for Money Borrowed of a
Restricted Subsidiary of the Borrower, in the principal amount of $300,000,000
plus accrued interest, fees and expenses, being repaid in full as of the
Agreement Date with the proceeds of the initial Advance of the Loans.

          "Notes" shall mean, collectively, the Revolving Notes
and the Term Notes.

          "Obligations" shall mean (i) all payment and performance obligations
of every kind, nature and description of the Borrower, its Restricted
Subsidiaries, and any other obligors to the Lenders (or their respective
Affiliates in the case of Interest Hedge Agreements), the Administrative Agent,
or any of them, under this Agreement and the other Loan Documents (including any
interest, fees


                                       16

<PAGE>   18
and other charges on the Loans or otherwise under the Loan Documents that would
accrue but for the filing of a bankruptcy action with respect to the Borrower,
any such Restricted Subsidiary, or any such other obligor, whether or not such
claim is allowed in such bankruptcy action), as they may be amended from time to
time, or as a result of making the Loans, whether such obligations are direct or
indirect, absolute or contingent, due or not due, contractual or tortious,
liquidated or unliquidated, arising by operation of law or otherwise, now
existing or hereafter arising, and (ii) the obligation to pay an amount equal to
the amount of any and all damage which the Lenders (or their respective
Affiliates in the case of Interest Hedge Agreements), the Administrative Agent,
or any of them, may suffer by reason of a breach by the Borrower, any of its
Restricted Subsidiaries, or any other obligor, of any obligation, covenant or
undertaking with respect to this Agreement or any other Loan Document.

          "Operating Cash Flow" shall mean, for any fiscal quarter, for the
Borrower and its Restricted Subsidiaries on a consolidated basis, Net Income for
such quarter (after eliminating any extraordinary gains and losses, including
gains and losses from the sale of assets, and minority interests, and equity in
earnings (losses) of non-consolidated entities), plus, to the extent deducted or
accrued in determining Net Income, the sum of each of the following for such
quarter: (i) depreciation, amortization, and other non-cash charges, (ii) income
tax expense, and (iii) interest expense net of interest income.

          "Parent" shall mean Western Wireless Corporation, a Washington
corporation.

          "Payment Date" shall mean the last day of any Interest Period.

          "PBGC" shall mean the Pension Benefit Guaranty Corporation, or any
successor thereto.

          "PCS System" shall mean a mobile communications system constructed and
operated in a BTA or an MTA (or any successor territorial designations) pursuant
to a License therefor issued by the FCC.

          "Performance Certificate" shall mean a certificate of the president or
chief financial officer of the Borrower as to its financial performance, in
substantially the form attached hereto as Exhibit C.



                                       17

<PAGE>   19
          "Permitted Asset Sale" shall mean the sale by the Borrower or any of
its Restricted Subsidiaries of all or any substantial part of its or their
assets as and to the extent permitted under Section 7.4(a) hereof.

          "Permitted Debt" shall mean Indebtedness for Money Borrowed permitted
to be incurred and to remain outstanding by the Borrower and its Restricted
Subsidiaries, pursuant to Section 7.1 hereof.

          "Permitted Investments" shall mean Investments described in and
permitted to be made under Section 7.6 hereof.

          "Permitted Liens" shall mean, as applied to any Person:

                   (a) Any Lien in favor of the Administrative Agent (for itself
and for the ratable benefit of the Lenders) given to secure the Obligations;

                   (b) (i) Liens on real estate for real estate taxes not yet
delinquent and (ii) Liens for taxes, assessments, judgments, governmental
charges or levies or claims the non-payment of which is being diligently
contested in good faith by appropriate proceedings and for which adequate
reserves have been set aside on such Person's books, but only so long as no
foreclosure, distraint, sale or similar proceedings have been commenced with
respect thereto and remain unstayed for a period of thirty (30) days after their
commencement;

                   (c) Liens of landlords, carriers, warehousemen, mechanics,
laborers and materialmen incurred in the ordinary course of business for sums
not yet due or being diligently contested in good faith, if reserves or
appropriate provisions shall have been made therefor;

                   (d) Liens incurred in the ordinary course of business in
connection with worker's compensation and unemployment insurance;

                   (e) Restrictions on the transfer of assets imposed by any of
the Licenses as now in effect or by the Communications Act, any state laws, and
any regulations thereunder;

                   (f) Easements, rights-of-way, restrictions and other similar
encumbrances on the use of real property which do not interfere with the
ordinary conduct of the business of such Person, or Liens incidental to the
conduct of the


                                       18

<PAGE>   20
business of such Person or to the ownership of its properties which were not
incurred in connection with Indebtedness or other extensions of credit and which
do not in the aggregate materially detract from the value of such properties or
materially impair their use in the operation of the business of such Person;

                   (g) Purchase money security interests, which are perfected
automatically by operation of law, only for the period (not to exceed twenty
(20) days) of automatic perfection under the law of the applicable jurisdiction,
and limited to Liens on assets so purchased;

                   (h) Liens reflected by Uniform Commercial Code financing
statements filed in respect of true leases; and

                   (i) Any Liens of record which secure Indebtedness in an
aggregate amount outstanding at any time not to exceed, in the aggregate with
other Specified Transactions, the Basket. Permitted Liens described in this
subsection (i) are listed as of the Agreement Date on Schedule 3 attached
hereto.

          "Person" shall mean an individual, corporation, limited liability
company, association, partnership, joint venture, trust or estate, an
unincorporated organization, a government or any agency or political subdivision
thereof, or any other entity.

          "Plan" shall mean, with respect to any Person, an employee benefit
plan within the meaning of Section 3(3) of ERISA or any other employee benefit
plan maintained for employees of such Person.

          "Pro Forma Debt Service" shall mean projected Debt Service for the
Borrower and its Restricted Subsidiaries on a consolidated basis with respect to
the next succeeding fiscal four-quarter period following the calculation date,
and after giving effect to any Interest Hedge Agreements and to existing
Eurodollar Advances. For purposes of this definition, (i) it shall be assumed
that the Indebtedness for Money Borrowed with respect to which Debt Service is
being calculated shall remain at the level outstanding on the calculation date
for the entire succeeding four fiscal- quarter except to the extent of principal
repayments required during such period, and (ii) where interest payments on
Indebtedness for Money Borrowed for the fiscal four-quarter period immediately
succeeding the calculation date are not fixed by way of Interest Hedge
Agreements, Eurodollar Advances, or otherwise for the entire period,


                                       19

<PAGE>   21
interest shall be calculated on such Indebtedness for Money Borrowed for periods
for which interest payments are not so fixed at the lower of (y) the Base Rate
Basis on the calculation date, or (z) the Eurodollar Basis which would be in
effect on the calculation date for a Eurodollar Advance having a twelve-month
Interest Period.

          "Reportable Event" shall have the meaning set forth in
Title IV of ERISA.

          "Request for Advance" shall mean a certificate designated as a
"Request for Advance," signed by an Authorized Signatory requesting an Advance
hereunder, which shall be in substantially the form of Exhibit D attached hereto
and shall, among other things, (i) specify the date of the Advance, which shall
be a Business Day, the amount of the Advance, the type of Advance, and, with
respect to a Eurodollar Advance, the Interest Period selected by the Borrower,
(ii) state that there shall not exist, on the date of the requested Advance both
before and after giving effect thereto, a Default, and (iii) as to an Advance
which will increase the principal amount of the Loans then outstanding, specify
the use of the proceeds of the Advance being requested.

          "Restricted Payment" shall mean (i) any direct or indirect
distribution, dividend or other cash payment by the Borrower or any of its
Restricted Subsidiaries to any Person (other than to the Borrower or any other
Restricted Subsidiary of the Borrower) on account of any general or limited
partnership interest in, or ownership of any shares of capital stock or other
securities of, the Borrower or any of its Restricted Subsidiaries; (ii) any
payment in respect of Subordinated Debt; or (iii) any payment by the Borrower or
any of its Restricted Subsidiaries to a Person other than the Borrower or any of
its Restricted Subsidiaries under any management or consulting agreement or
other similar agreement or arrangement not entered into in the ordinary course
of business.

          "Restricted Purchase" shall mean any payment by the Borrower or any of
its Restricted Subsidiaries on account of the purchase, redemption or other
acquisition or retirement of any general or limited partnership interest in, or
shares of capital stock or other securities of, the Borrower or any of the
Borrower's Restricted Subsidiaries, including, without limitation, any warrants
or other rights or options to acquire shares of capital stock or partnership
interests of the Borrower or any of the Borrower's Restricted Subsidiaries.


                                       20

<PAGE>   22
          "Restricted Subsidiaries" shall mean the Subsidiaries of the Borrower
whose assets and capital stock are pledged as security for the Obligations which
are designated as of the Agreement Date as Restricted Subsidiaries on Schedule 4
attached hereto, each of which shall be a signatory to the Subsidiary Guaranty
and the Subsidiary Security Agreement. "Restricted Subsidiaries" shall also
include Subsidiaries of the Borrower designated by the Borrower as Restricted
Subsidiaries after the Agreement Date, pursuant to the provisions of Section
5.13(a) hereof.

          "Revolving Loan Commitment" shall mean the several obligations of
certain of the Lenders to advance the sum of up to $500,000,000 to the Borrower
on or after the Agreement Date, in accordance with their respective Commitment
Ratios for the Revolving Loans and as such amount may be reduced from time to
time, all pursuant to the terms hereof.

          "Revolving Loan Maturity Date" shall mean the earlier of (a) December
31, 2006, or (b) such earlier date on which the payment of all outstanding
Obligations shall be due (whether by acceleration or otherwise).

          "Revolving Loans" shall mean, collectively, the amount advanced by
certain of the Lenders to the Borrower under the Revolving Loan Commitment, not
to exceed the amount of the Revolving Loan Commitment, and evidenced by the
Revolving Notes.

          "Revolving Notes" shall mean those certain revolving promissory notes
in the aggregate original principal amount of $500,000,000, one issued by the
Borrower to each of the Lenders issuing a Revolving Loan Commitment in
accordance with each such Lender's Commitment Ratio for the Revolving Loan
Commitment, each one substantially in the form of Exhibit E attached hereto, and
any extensions, modifications, renewals or replacements of or amendments to any
of the foregoing.

          "RSA" shall mean any "rural service area" as defined and modified by
the FCC for the purpose of licensing public cellular radio telecommunications
service systems.

          "Security Agreement" shall mean that certain Security Agreement
between the Borrower and the Administrative Agent, of even date, substantially
in the form of Exhibit F attached hereto.

          "Security Documents" shall mean the Borrower's Pledge Agreement, the
Subsidiary Guaranty, the Subsidiary Pledge


                                       21

<PAGE>   23
Agreement, the Security Agreement, the Subsidiary Security Agreement, the
VoiceStream Guaranty, the VoiceStream Pledge Agreement, any other agreement or
instrument providing collateral for the Obligations whether now or hereafter in
existence, and any filings, instruments, agreements, and documents related
thereto or to this Agreement, and providing the Administrative Agent, for itself
and for the ratable benefit of the Lenders, with Collateral for the Obligations.

          "Security Interest" shall mean all Liens in favor of the
Administrative Agent, for itself and for the ratable benefit of the Lenders,
created hereunder or under any of the Security Documents to secure the
Obligations.

          "Senior Debt" shall mean for the Borrower and its Restricted
Subsidiaries on a consolidated basis, the sum (without duplication) of their
Indebtedness for Money Borrowed.

          "Specified Transactions" shall mean each of the following, when
entered into by the Borrower or any of its Restricted Subsidiaries: (i)
Capitalized Lease Obligations; (ii) Indebtedness in the form of a sale-leaseback
transaction; and (iii) additional secured and unsecured Indebtedness for Money
Borrowed (other than the Obligations).

          "Subordinated Debt" shall mean up to $500,000,000 in net proceeds of
subordinated Indebtedness for Money Borrowed issued by VoiceStream, which shall
be unsecured with respect to VoiceStream, the Borrower and the Restricted
Subsidiaries of the Borrower, and shall be further subject to the following: (i)
the Borrower shall, in a certificate provided on the date of its receipt of the
net proceeds of such subordinated Indebtedness for Money Borrowed, demonstrate
its projected pro forma compliance (giving effect to the incurrence of such
subordinated Indebtedness for Money Borrowed) with the applicable Financial
Covenants; (ii) the final maturity of such subordinated Indebtedness for Money
Borrowed must be at least one year and one day after the Final Maturity Date;
(iii) such subordinated Indebtedness for Money Borrowed shall contain no
covenants or provisions more restrictive on the Borrower and its Restricted
Subsidiaries than those contained herein; and (iv) interest shall accrue and not
be payable for a period of at least five (5) years from the date of incurrence
of such Indebtedness for Money Borrowed.



                                       22

<PAGE>   24
          "Subsidiary" shall mean, as applied to any Person, (a) any corporation
of which more than fifty percent (50%) of the outstanding stock (other than
directors' qualifying shares) having ordinary voting power to elect its board of
directors, regardless of the existence at the time of a right of the holders of
any class or classes of securities of such corporation to exercise such voting
power by reason of the happening of any contingency, or any partnership of which
more than fifty percent (50%) of the outstanding partnership interests, is at
the time owned directly or indirectly by such Person, or by one or more
Subsidiaries of such Person, or by such Person and one or more Subsidiaries of
such Person, or (b) any other entity which is directly or indirectly controlled
or capable of being controlled by such Person, or by one or more Subsidiaries of
such Person, or by such Person and one or more Subsidiaries of such Person.
"Subsidiaries" as used herein, unless otherwise indicated, shall mean all
Subsidiaries of the Borrower, including Restricted Subsidiaries and Unrestricted
Subsidiaries. The Subsidiaries of the Borrower as of the Agreement Date are set
forth on Schedule 4 attached hereto.

          "Subsidiary Guaranty" shall mean that certain Subsidiary Guaranty in
favor of the Administrative Agent, for itself and for the ratable benefit of the
Lenders, given by each Restricted Subsidiary of the Borrower, of even date,
substantially in the form of Exhibit G attached hereto, and any similar guaranty
delivered pursuant to Section 5.13 hereof.

          "Subsidiary Pledge Agreement" shall mean that certain Subsidiary
Pledge Agreement between each Restricted Subsidiary of the Borrower having one
or more of its own corporate Restricted Subsidiaries, on the one hand, and the
Administrative Agent, on the other hand, of even date, substantially in the form
of Exhibit H attached hereto, and any similar pledge agreement delivered
pursuant to Section 5.13 hereof.

          "Subsidiary Security Agreement" shall mean that certain Subsidiary
Security Agreement between each of the Borrower's Restricted Subsidiaries, on
the one hand, and the Administrative Agent, on the other hand, of even date
herewith, substantially in the form of Exhibit I attached hereto, and any
similar security agreement delivered pursuant to Section 5.13 hereof.

          "Term Loans" shall mean, collectively, the amounts advanced by certain
of the Lenders to the Borrower in an aggregate amount of up to $500,000,000,
consisting of


                                       23

<PAGE>   25
$250,000,000 in Tranche A Term Loans and $250,000,000 in Tranche B Loans,
evidenced by the Term Notes, as set forth as of the Agreement Date on Schedule 1
attached hereto.

          "Term Notes" shall mean the Tranche A Term Notes and the Tranche B
Term Notes.

          "Total Debt" shall mean for VoiceStream, the Borrower and the
Borrower's Restricted Subsidiaries, on a consolidated basis, the sum (without
duplication) of their Indebtedness for Money Borrowed.

          "Tranche A Term Loan Commitment" shall mean the several obligations of
certain of the Lenders to advance the sum of up to $250,000,000 to the Borrower
not later than December 31, 1998, in accordance with their respective Commitment
Ratios for the Tranche A Term Loans, and as such amount may be reduced from time
to time, all pursuant to the terms hereof.

          "Tranche A Term Loans" shall mean, collectively, the amount advanced
by certain of the Lenders to the Borrower under the Tranche A Term Loan
Commitment, not to exceed the amount of the Tranche A Term Loan Commitment, and
evidenced by the Tranche A Term Notes.

          "Tranche A Term Notes" shall mean those certain term notes in the
aggregate original principal amount of $250,000,000, one issued by the Borrower
to each of the Lenders issuing a Tranche A Term Loan Commitment in accordance
with each such Lender's Commitment Ratio for the Tranche A Term Loan Commitment,
each one substantially in the form of Exhibit J attached hereto, and any
extensions, modifications, renewals or replacements of or amendments to any of
the foregoing.

          "Tranche B Term Loan Commitment" shall mean the several obligations of
certain of the Lenders to advance the sum of up to $250,000,000 to the Borrower
on the Agreement Date in accordance with their respective Commitment Ratios for
the Tranche B Term Loans, all pursuant to the terms hereof.

          "Tranche B Term Loans" shall mean, collectively, the amount advanced
by certain of the Lenders to the Borrower under the Tranche B Term Loan
Commitment, not to exceed the amount of the Tranche B Term Loan Commitment and
evidenced by the Tranche B Term Notes.



                                       24

<PAGE>   26
          "Tranche B Term Notes" shall mean those certain term notes in the
aggregate original principal amount of $250,000,000, one issued by the Borrower
to each of the Lenders issuing a Tranche B Term Loan Commitment in accordance
with each such Lender's Commitment Ratio for the Tranche B Term Loan Commitment,
each one substantially in the form of Exhibit K attached hereto, and any
extensions, modifications, renewals or replacements of or amendments to any of
the foregoing.

          "Unrestricted Subsidiaries" shall mean the Subsidiaries of the
Borrower designated as Unrestricted Subsidiaries on Schedule 4 attached hereto,
together with any Subsidiaries of the Borrower created or acquired after the
Agreement Date which are not Restricted Subsidiaries.

          "Use of Proceeds Letter" shall mean that certain Use of Proceeds
Letter, substantially in the form of Exhibit L attached hereto, delivered to the
Administrative Agent and the Lenders on the Agreement Date pursuant to Article 3
hereof.

          "VoiceStream" shall mean VoiceStream Wireless Corporation, a Delaware
corporation (f/k/a Western PCS Corporation) and the direct, one hundred percent
(100%) parent company of the Borrower.

          "VoiceStream Agreements" shall mean (i) that certain Tax Sharing
Agreement, dated as of February 17, 1998, among the Parent, VoiceStream and
Hutchison, (ii) that certain Services Agreement, dated as of February 17, 1998,
between the Parent and VoiceStream, (iii) that certain Cash Management Agreement
dated as of February 17, 1998, between the Parent and VoiceStream, (iv) that
certain Roaming Agreement, dated as of February 17, 1998, between the Parent and
VoiceStream, and (v) that certain Shareholders Agreement; dated as of February
17, 1998, among the Parent, VoiceStream, and Hutchison.

          "VoiceStream Guaranty" shall mean that certain Guaranty of the
Obligations by VoiceStream in favor of the Administrative Agent, for itself and
for the ratable benefit of the Lenders, of even date, substantially in the form
of Exhibit N attached hereto.

          "VoiceStream Pledge Agreement" shall mean that certain Pledge
Agreement of even date, given by VoiceStream in favor of the Administrative
Agent, for itself and for the ratable benefit of the Lenders, of even date,
substantially in the form of Exhibit M attached hereto.


                                       25

<PAGE>   27
          * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

          Each definition of an agreement or instrument in this Article 1 shall
include such agreement or instrument as amended, modified, renewed or restated
from time to time in accordance herewith.

                                    ARTICLE 2

                                      Loans

          Section 2.1       The Loans.

          (a) The Lenders who have issued a Revolving Loan Commitment agree,
severally in accordance with their respective Commitment Ratios for the
Revolving Loan Commitment and not jointly, upon the terms and subject to the
conditions of this Agreement, to lend and re-lend to the Borrower, on and after
the Agreement Date (provided that the Term Loans have been fully drawn), amounts
requested by the Borrower which, in the aggregate, do not exceed at any time the
amount of the Revolving Loan Commitment. Advances under the Revolving Loan
Commitment may be repaid and reborrowed as provided in Section 2.2 hereof in
order to reborrow Eurodollar Advances for new Interest Periods, to effect
changes in the Interest Rate Bases applicable to the Advances hereunder, or
otherwise. Revolving Loans will bear interest at the Eurodollar Basis or the
Base Rate Basis as provided in Section 2.3 hereof.

          (b) The Lenders who have agreed to make Tranche A Term Loans agree,
severally in accordance with their respective Commitment Ratios for the Tranche
A Term Loan Commitment and not jointly, upon the terms and subject to the
conditions of this Agreement, to lend to the Borrower, on or prior to December
31, 1998, in multiple Advances, an aggregate amount not to exceed $250,000,000.
Tranche A Term Loans will bear interest at the Eurodollar Basis or the Base Rate
Basis as provided in Section 2.3 hereof.

          (c) The Lenders who have agreed to make Tranche B Term Loans agree,
severally and in accordance with their respective Commitment Ratios for the
Tranche B Term Loan Commitment and not jointly, upon the terms and subject to
the conditions of this Agreement, to lend to the Borrower on the Agreement Date,
an amount not to exceed $250,000,000. Tranche B Term Loans will bear interest at
the Eurodollar Basis or the Base Rate Basis as provided in Section 2.3 hereof.



                                       26

<PAGE>   28
          (d) The Borrower may also borrow up to $200,000,000 of Additional
Facility Indebtedness, subject to the following conditions: (i) the Additional
Facility Indebtedness shall be acceptable to the Majority Lenders and on terms
and conditions no more favorable to the Borrower than the terms and conditions
of the Tranche B Term Loans and shall have a final maturity no earlier than the
Final Maturity Date; (ii) each Lender hereunder shall be offered the opportunity
(but shall not be obligated) to issue a commitment for its pro rata share of
such Additional Facility Indebtedness; and (iii) the Additional Facility
Indebtedness shall constitute Obligations hereunder and shall rank pari passu
with the other Obligations.

          Section 2.2       Manner of Borrowing and Disbursement.

          (a) Choice of Interest Rate, Etc. Any Advance under the Revolving Loan
Commitment shall, at the option of the Borrower, be made as a Base Rate Advance,
or, subject to Article 10 hereof, a Eurodollar Advance; provided, however, that
at such time as there shall have occurred and be continuing a Default hereunder,
the Borrower shall not have the right to borrow or to re-borrow any Eurodollar
Advances under the Revolving Loan Commitment, and all subsequent Advances under
the Revolving Loan Commitment shall be made as Base Rate Advances. Subject to
the provisions of Article 10 hereof, any Advance of the Term Loans may be made
as a Base Rate Advance or a Eurodollar Advance; provided, however, that at such
time as there shall have occurred and be continuing a Default hereunder, subject
to the rights of the Lenders under Section 8.2 hereof, subsequent rollover
Advances of either Term Loan shall have a one month Interest Period; and
provided further, that in the event that for any reason Eurodollar Advances are
not available, Advances of the Term Loans shall be made as Base Rate Advances.
Any notice given to the Administrative Agent in connection with a requested
Advance hereunder shall be given to the Administrative Agent prior to 11:30 a.m.
(Houston time) in order for such Business Day to count toward the minimum number
of Business Days required.

          (b) Base Rate Advances.

                   (i) Initial Advances. The Borrower shall give the
          Administrative Agent in the case of Base Rate Advances at least one
          (1) Business Day's irrevocable prior written notice in the form of a
          Request for Advance, or telephonic notice followed immediately by a
          Request for Advance; provided, however, that the Borrower's failure to
          confirm any telephonic notice


                                       27

<PAGE>   29
          with a Request for Advance shall not invalidate any notice so given.

                   (ii) Repayments and Reborrowings. Upon at least one (1), with
          respect to items (A) and (C) of this sentence, or three (3), with
          respect to item (B) of this sentence, Business Days' irrevocable prior
          written notice to the Administrative Agent, the Borrower may repay or
          prepay a Base Rate Advance without regard to its Payment Date and (A)
          reborrow all or a portion of the principal amount thereof as one or
          more Base Rate Advances, (B) reborrow all or a portion of the
          principal thereof as one or more Eurodollar Advances, or (C) not
          reborrow all or any portion of such Base Rate Advance at that time. On
          the date indicated by the Borrower, such Base Rate Advance shall be so
          repaid and, as applicable, reborrowed. Failure of the Borrower to
          provide notice hereunder shall not affect its obligation to repay the
          applicable Eurodollar Advance on such Payment Date.

          (c) Eurodollar Advances.

                          (i) Initial Advances. The Borrower shall give the
          Administrative Agent in the case of Eurodollar Advances at least three
          (3) Business Days' irrevocable prior written notice in the form of a
          Request for Advance, or telephonic notice followed immediately by a
          Request for Advance; provided, however, that the Borrower's failure to
          confirm any telephonic notice with a Request for Advance shall not
          invalidate any notice so given. The Administrative Agent, whose
          determination shall be conclusive absent manifest error, shall
          determine the available Eurodollar Bases and shall notify the Borrower
          of such Eurodollar Bases. The Borrower shall promptly notify the
          Administrative Agent by telephone or telecopy, and shall immediately
          confirm any such telephonic notice in writing, of its selection of a
          Eurodollar Basis and Interest Period for such Advance; provided,
          however, that the Borrower's failure to confirm any such telephonic
          notice in writing shall not invalidate any notice so given.

                         (ii) Repayments and Reborrowings. At least three (3)
          Business Days prior to the Payment Date for a Eurodollar Advance, the
          Borrower shall give the Administrative Agent written notice specifying
          whether all or a portion of such Eurodollar Advance outstanding on the
          Payment Date (A) is to be repaid and then reborrowed in whole or in
          part as a Eurodollar Advance,


                                       28

<PAGE>   30
          and the Interest Period selected, (B) is to be repaid and then
          reborrowed in whole or in part as a Base Rate Advance or (C) is to be
          repaid and not reborrowed at that time. Upon such Payment Date such
          Eurodollar Advance will, subject to the provisions hereof, be so
          repaid and, as applicable, reborrowed.


          (d) Notification of Lenders. Upon receipt of a Request for Advance, or
a notice from the Borrower with respect to a selection of an Interest Period, or
a notice from the Borrower with respect to any outstanding Advance prior to the
Payment Date for such Advance, the Administrative Agent shall promptly notify
each Lender by telephone or telecopy of the contents thereof and the amount of
such Lender's portion of the Advance. Each Lender shall, not later than 1:30
p.m. (Houston time) on the date of borrowing specified in such notice, make
available to the Administrative Agent at the Administrative Agent's Office, or
at such account as the Administrative Agent shall designate, the amount of its
portion of any Advance which represents an additional borrowing hereunder in
immediately available funds.

          (e) Disbursement.

                          (i) Prior to 3:00 p.m. (Houston time) on the date of
          an Advance hereunder, the Administrative Agent shall, subject to the
          satisfaction of any applicable conditions set forth in Article 3
          hereof, disburse the amounts made available to it by the Lenders in
          like funds by (a) transferring the amounts so made available by wire
          transfer pursuant to the Borrower's instructions, or (b) in the
          absence of such instructions, crediting the amounts so made available
          to the account of the Borrower maintained with the Administrative
          Agent.

                         (ii) Unless the Administrative Agent shall have
          received notice from a Lender prior to 2:00 p.m. (Houston time) on the
          date of any Advance that such Lender will not make available to the
          Administrative Agent such Lender's ratable portion of such Advance,
          the Administrative Agent may assume that such Lender has made or will
          make such portion available to the Administrative Agent on the date of
          such Advance and the Administrative Agent may in its sole discretion
          and in reliance upon such assumption, make available to the Borrower
          on such date a corresponding amount. If and to the extent the Lender
          does not make such ratable


                                       29

<PAGE>   31
          portion available to the Administrative Agent, such Lender agrees to
          repay to the Administrative Agent on demand such corresponding amount
          together with interest thereon, for each day from the date such amount
          is made available to the Borrower until the date such amount is repaid
          to the Administrative Agent, at the Federal Funds Rate for the first
          three (3) days and thereafter at the Federal Funds Rate plus one
          percent (1%).

                        (iii) If such Lender shall repay to the Administrative
          Agent such corresponding amount, such amount so repaid shall
          constitute such Lender's portion of the applicable Advance for
          purposes of this Agreement. If such Lender does not repay such
          corresponding amount immediately upon the Administrative Agent's
          demand therefor, the Administrative Agent shall notify the Borrower
          and the Borrower shall immediately pay such corresponding amount to
          the Administrative Agent, together with interest thereon. The failure
          of any Lender to fund its portion of any Advance shall not relieve any
          other Lender of its obligation hereunder to fund its respective
          portion of the Advance on the date of such borrowing, but no Lender
          shall be responsible for any such failure of any other Lender.

                         (iv) In the event that, at any time when the Borrower
          is not in Default and has satisfied all applicable conditions set
          forth in Article 3 hereof, a Lender for any reason fails or refuses to
          fund its portion of an Advance, then, until such time as such Lender
          has funded its portion of such Advance, or all other Lenders have
          received payment in full (whether by repayment or prepayment) of the
          principal and interest due in respect of such Advance, such
          non-funding Lender shall not have the right (i) to vote regarding any
          issue on which voting is required or advisable under this Agreement or
          any other Loan Document and the amount of the Revolving Loan
          Commitment and Term Loans, as applicable, or Loans, as applicable,
          held by such Lender shall not be counted as outstanding for purposes
          of determining "Majority Lenders" hereunder, and (ii) to receive
          payments of principal, interest or fees from the Borrower in respect
          of its unfunded portion of Advances.

          Section 2.3 Interest.

          (a) On Base Rate Advances. Interest on each Base Rate Advance shall be
computed on the basis of a year of 365/366


                                       30

<PAGE>   32
days for the actual number of days elapsed and shall be payable at the Base Rate
Basis for such Advance, in arrears on the applicable Payment Date for the period
through the date immediately preceding such Payment Date. Interest on Base Rate
Advances then outstanding shall also be due and payable on the Revolving Loan
Maturity Date with respect to Revolving Loans and Tranche A Term Loans, and on
the Final Maturity Date with respect to the Tranche B Term Loans.

          (b) On Eurodollar Advances. Interest on each Eurodollar Advance shall
be computed on the basis of a 360-day year for the actual number of days elapsed
and shall be payable at the Eurodollar Basis for such Advance, in arrears on the
applicable Payment Date for the period through the day immediately preceding
such Payment Date, and, in addition, if the Interest Period for a Eurodollar
Advance exceeds three (3) months, interest on such Eurodollar Advance shall also
be due and payable in arrears on every three-month anniversary of the beginning
of such Interest Period. Interest on Eurodollar Advances then outstanding shall
also be due and payable on the Revolving Loan Maturity Date with respect to
Revolving Loans and Tranche A Term Loans and on the Final Maturity Date with
respect to the Tranche B Term Loans.

          (c) Interest if No Notice of Selection of Interest Rate Basis. With
respect to Revolving Loans, if the Borrower fails to give the Administrative
Agent timely notice of its selection of a Eurodollar Basis, or if for any reason
a determination of a Eurodollar Basis for any Advance is not timely concluded,
the Base Rate Basis shall apply to such Advance. With respect to the Term Loans,
if the Borrower fails to give the Administrative Agent timely notice of its
selection of an Interest Period for any rollover Advance, a one month Interest
Period shall apply.

          (d) Interest Upon Default. Immediately upon the occurrence of an Event
of Default hereunder, the outstanding principal balance of the Loans, together
with accrued and unpaid interest and other unpaid sums, shall bear interest at
the Default Rate. Such interest shall be payable on demand and shall accrue
until the earliest of (a) waiver or cure (to the satisfaction of the Lenders
required under Section 11.12 hereof to waive or cure) of the applicable Event of
Default, or (b) agreement by the Majority Lenders to rescind the charging of
interest at the Default Rate, or (c) payment in full of the Obligations.

          (e) Eurodollar Advances. At no time may the number of outstanding
Eurodollar Advances exceed ten (10), with


                                       31

<PAGE>   33
respect to the Revolving Loan Commitment, or five (5), with respect to either
the Tranche A Term Loan Commitment or the Tranche B Term Loan Commitment.

          (f) Applicable Margin. (i) With respect to any Advance of the Tranche
A Term Loans, or any Advance under the Revolving Loan Commitment, the Applicable
Margin shall be as of any calculation date the interest rate margin determined
by the Administrative Agent based upon the table set forth below (which tests
the Borrower's Leverage Ratio (Total Debt) after the Minimum Contributed Capital
has been raised), determined for the most recent fiscal quarter end, effective
as of the second Business Day after the financial statements referred to in
Section 6.1 hereof are required to be furnished by the Borrower to the
Administrative Agent and each Lender for the fiscal quarter most recently ended
(except with respect to clause (b), which adjustment to the Applicable Margin
shall be effective on the date of receipt by the Borrower of the Investment by
VoiceStream of Minimum Additional Contributed Capital), expressed as a per annum
rate of interest as follows:


<TABLE>
<CAPTION>
                                         Base Rate Advance               Eurodollar Advance
Leverage Ratio (Total Debt)              Applicable Margin               Applicable Margin
---------------------------              -----------------               -----------------
<S>                                      <C>                             <C>   
(a)  Agreement Date                          1.500%                           2.500%
     and thereafter
     (until the
     occurrence of
     (b) or (c))

(b)  After Minimum                           1.250%                           2.250%
     Additional
     Contributed
     Capital raised
     (until the
     occurrence of (c))


(c)  After the Borrower's                    1.125%                           2.125%
     Annualized Operating Cash
     Flow as of the end of any
     fiscal quarter exceeds $0, but
     the Leverage Ratio (Total
     Debt) exceeds 10.0:1

Greater than 8.00,                           1.000%                           2.000%
but less than or
equal to 10.00

Greater than 7.00,                           0.750%                           1.750%
but less than or
equal to 8.00

Greater than 6.00,                           0.500%                           1.500%
but less than or
equal to 7.00
</TABLE>



                                       32

<PAGE>   34
<TABLE>
<CAPTION>
                                         Base Rate Advance               Eurodollar Advance
Leverage Ratio (Total Debt)              Applicable Margin               Applicable Margin
---------------------------              -----------------               -----------------
<S>                                      <C>                             <C>   
Greater than 5.00,                           0.250%                           1.250%
but less than or
equal to 6.00

Less than or equal to                        0.000%                           1.000%
5.00
</TABLE>


In the event that the Borrower fails to timely provide (i) the financial
statements referred to above in accordance with the terms of Section 6.1 hereof
or (ii) the Performance Certificate referred to in Section 6.3 hereof, and
without prejudice to any additional rights under Section 8.2 hereof, no downward
adjustment of the Applicable Margin in effect for the preceding quarter shall
occur until the actual delivery of such statements.

     (ii) With respect to the Tranche B Term Loan, the Applicable Margin for
Eurodollar Advances shall be 2.75% and for Base Rate Advances, 1.75%; provided
however, that in the event that the Leverage Ratio (Total Debt) as of the end of
any fiscal quarter is less than or equal to 10.00:1, the Applicable Margin for
Eurodollar Advances of the Tranche B Term Loan shall be 2.50% and the Applicable
Margin for Base Rate Advances of the Tranche B Term Loan shall be 1.50%. Any
adjustment in the Applicable Margin for Advances under the Tranche B Term Loan
shall be effective as of the same date as adjustments under subsection (i) of
this Section 2.3(f).

     Section 2.4 Repayment. (a) Commencing September 30, 2001 and at the end of
each calendar quarter thereafter, the Revolving Loan Commitment shall be reduced
by an amount equal to the percentages (for such quarter and year) set forth
below, and the outstanding principal balance of the Tranche A Term Loans shall
be repaid by an amount equal to the percentages (for such quarter and year) set
forth below:


<TABLE>
<CAPTION>
                                           Percentage of              Annual Percentage
                                          Tranche A Term              of Tranche A Term
                                         Loans Outstanding            Loans Outstanding
                                          as of September         as of September 30, 2001
                                             30, 2001                 and of Revolving
                                         and of Revolving            Loan Commitment to
                                        Loan Commitment to             be Reduced Each
                                          be Reduced Each                Period Ending
Quarters Ending                              Quarter:                   December 31:
---------------                         ------------------          ------------------------
<S>                                     <C>                              <C>  
September 30,                                2.50%                            5.00%
2001 through and
including
December 31, 2001

March 31, 2002                               2.50%                           10.00%
through and
including
December 31, 2002
</TABLE>


                                       33


<PAGE>   35
<TABLE>
<CAPTION>
                                           Percentage of              Annual Percentage
                                          Tranche A Term              of Tranche A Term
                                         Loans Outstanding            Loans Outstanding
                                          as of September         as of September 30, 2001
                                             30, 2001                 and of Revolving
                                         and of Revolving            Loan Commitment to
                                        Loan Commitment to             be Reduced Each
                                          be Reduced Each                Period Ending
Quarters Ending                              Quarter:                   December 31:
---------------                         ------------------          ------------------------
<S>                                     <C>                              <C>  
March 31, 2003                               3.75%                           15.00%
through and
including
December 31, 2003

March 31, 2004                               5.00%                           20.00%
through and
including
December 31, 2004

March 31, 2005                               6.25%                           25.00%
through and
including
December 31, 2005

March 31, 2006                               6.25%                           25.00%
through and
including
December 31, 2006
</TABLE>

To the extent the outstanding principal amount of the Revolving Loans exceeds
the Revolving Loan Commitment as so reduced, the Revolving Loans shall be
repaid. Any unpaid principal and interest of the Tranche A Term Loans or of the
Revolving Loans and any other outstanding Obligations under the Revolving Loan
Commitment or the Tranche A Term Loan Commitment shall be due and payable in
full on the Revolving Loan Maturity Date.

     (b) Commencing September 30, 2001 and at the end of each calendar quarter
thereafter, the outstanding principal balance of the Tranche B Term Loans as of
the opening of business on September 30, 2001 shall be repaid as set forth
below:


<TABLE>
<CAPTION>
                                       Percentage of                  Annual Percentage  
                                      Tranche B Term                  of Tranche B Term  
                                     Loans Outstanding                Loans Outstanding  
                                      as of September                as of September 30, 
                                      30, 2001 to be                 2001 to be Reduced  
                                       Reduced Each                  Each Period Ending  
Quarters Ending                          Quarter:                          December 31:  
---------------                      -----------------               ------------------  
<S>                                  <C>                             <C>
September 30,                                .500%                            1.0%
2001 through and
including
December 31,
2001

March 31, 2002                               .250%                            1.0%
through and
including
December 31,
2002
</TABLE>


                             34


<PAGE>   36

<TABLE>
<CAPTION>
                                       Percentage of                  Annual Percentage  
                                      Tranche B Term                  of Tranche B Term  
                                     Loans Outstanding                Loans Outstanding  
                                      as of September                as of September 30, 
                                      30, 2001 to be                 2001 to be Reduced  
                                       Reduced Each                  Each Period Ending  
Quarters Ending                          Quarter:                          December 31:  
---------------                      -----------------               ------------------  
<S>                                  <C>                             <C>
March 31, 2003                               .250%                            1.0%
through and
including
December 31,
2003

March 31, 2004                               .250%                            1.0%
through and
including
December 31,
2004

March 31, 2005                               .250%                            1.0%
through and
including
December 31,
2005

March 31, 2006                               .250%                            1.0%
through and
including
December 31,
2006

March 31, 2007                               47.0%                           94.0%
through and
including June
30, 2007
</TABLE>

Any unpaid principal and interest of the Tranche B Term Loans and any other
outstanding Obligations shall be due and payable in full on the Final Maturity
Date.

     Section 2.5 Fees. (a) Fees Payable Under the Fee Letters. The Borrower
agrees to pay such fees as are mutually agreed upon and as are described in the
Fee Letters.

     (b) Commitment Fee. In addition, the Borrower agrees to pay to the
Administrative Agent, for the benefit of each of the Lenders who have issued a
Revolving Loan Commitment or have agreed to make Tranche A Term Loans, in
accordance with their respective Commitment Ratios for such facilities, a
commitment fee on the aggregate unborrowed balance of the Revolving Loan
Commitment, for each day from the Agreement Date until the Revolving Loan
Maturity Date, and on the aggregate unborrowed amount of the Tranche A Term Loan
Commitment, for each day from the Agreement Date until December 31, 1998, at a
rate of one-half of one percent (1/2%) per annum, provided, however, that for
any period of time in which the Applicable Margin for Eurodollar Advances of the
Revolving Loans shall be 1.50% or less, the commitment fee shall be imposed at a
rate of three-eighths of one percent (3/8%). Such commitment fee shall be
computed on the basis of a year of 365/366 days for the 


                                       35


<PAGE>   37
actual number of days elapsed, shall be payable quarterly in arrears on the last
Business Day of each calendar quarter, commencing September 30, 1998, shall be
fully earned when due, and shall be non-refundable when paid.

     Section 2.6 Prepayments.

     (a) Prepayment of Advances. The principal amount of any Base Rate Advance
may be prepaid in full or in part at any time, without penalty or premium and
without regard to the Payment Date for such Advance, upon not less than three
(3) Business Days' prior written notice to the Administrative Agent of such
prepayment. Eurodollar Advances may be prepaid prior to the applicable Payment
Date, upon not less than three (3) Business Days' prior written notice to the
Administrative Agent, provided that the Borrower shall reimburse the Lenders and
the Administrative Agent, on demand, for any loss or out-of-pocket expense
incurred by any Lender or the Administrative Agent in connection with such
prepayment, as set forth in Section 2.11 hereof.

     (b) Prepayment of Loans. Amounts permanently prepaid on the Revolving Loans
whether by way of refinancing or prepayment of Advances under the Revolving Loan
Commitment accompanied by a corresponding permanent reduction in the Revolving
Loan Commitment shall, unless otherwise specified herein, be applied to interest
and fees then outstanding hereunder on account of Revolving Loans and under the
Revolving Notes, and then to principal. Amounts prepaid on the Term Loans
whether by way of refinancing or prepayment of Advances under the Term Loans
shall, unless otherwise specified herein, be applied to interest then
outstanding hereunder on account of the Term Loans and under the Term Notes, and
then to principal. A notice of prepayment shall be irrevocable. Upon receipt of
any notice of prepayment or reduction, the Administrative Agent shall promptly
notify each Lender of the contents thereof by telephone or telecopy and of such
Lender's portion of the prepayment. Any portion of the Loans which is
permanently prepaid may not be reborrowed. Permanent prepayments of the
Revolving Loans accompanied by a corresponding permanent reduction in the
Revolving Loan Commitment, and prepayments of the Tranche A Term Loans, shall be
applied to the repayment schedule set forth in Section 2.4(a) hereof in inverse
order of maturity. Prepayments of the Tranche B Term Loans shall be applied to
the repayment schedule set forth in Section 2.4(b) hereof in inverse order of
maturity. Partial prepayments shall be in a principal amount of not less than
$5,000,000, and in an integral multiple of $1,000,000. Voluntary permanent


                                       36


<PAGE>   38
prepayments of the Loans shall be applied pro rata to the outstanding Tranche A
Term Loans, the outstanding Tranche B Term Loans and to the Revolving Loan
Commitment.

     Section 2.7 Borrower's Optional Cancellation of the Revolving Loan
Commitment. The Borrower shall have the right, on three (3) Business Days'
irrevocable notice to the Administrative Agent, to cancel all or a portion of
the Revolving Loan Commitment, on a pro rata basis among the Lenders holding
Revolving Loan Commitments, provided that (i) any such cancellation shall be
made in a principal amount of not less than $5,000,000, and in an integral
multiple of $1,000,000; (ii) as of the effective date of such notice, the
Revolving Loan Commitment shall be permanently reduced to the amount stated in
the Borrower's notice for all purposes herein; and (iii) payment shall be made
on or prior to the effective date of such notice of any amount necessary to
reduce the amount of the Revolving Loans outstanding under the Revolving Loan
Commitment to not more than the amount of the Revolving Loan Commitment as
reduced, to be applied as provided in Section 2.6(b), together with any amount
required to be paid by the Borrower under Section 2.11 hereof.

     Section 2.8 Mandatory Prepayments. In addition to the scheduled repayments
provided for in Section 2.4 hereof, the Borrower shall prepay the Loans as
follows:

     (a) Repayment From Excess Cash Flow. On or prior to June 30, 2000, and on
or prior to each June 30th thereafter during the term of this Agreement, the
Borrower shall make an additional prepayment of the outstanding principal amount
of the Loans in an amount equal to fifty percent (50%) of Excess Cash Flow for
the previous fiscal year. Amounts so prepaid shall be applied to the repayment
schedule set forth in Section 2.4(a) and Section 2.4(b) hereof in inverse order
of maturity and shall be applied pro rata to the remaining Revolving Loan
Commitment, the outstanding Tranche A Term Loans, and the outstanding Tranche B
Term Loans. Accrued interest on the principal amount of the Loans being prepaid
pursuant to this Section 2.8(a) to the date of such prepayment will be paid by
the Borrower concurrently with such principal prepayment.

     (b) From Permitted Asset Sales. Net Proceeds from any Permitted Asset Sale
of one or more Core Properties shall be applied, on the Business Day of receipt
thereof by the Borrower or the affected Restricted Subsidiary, as follows:


                                       37


<PAGE>   39
          (i) Except as otherwise permitted in Section 2.8(b)(ii) hereof, to
     permanently prepay the outstanding principal amount of the Loans and
     permanently reduce the Revolving Loan Commitment in order of maturity and
     shall be allocated pro rata among the Revolving Loan Commitment and the
     outstanding principal balance of the Term Loans, provided that such amounts
     prepaid with Net Proceeds and allocated to the Revolving Loan Commitment
     may be reborrowed by the Borrower in an amount not to exceed, in the
     aggregate, the amount of the Revolving Loan Commitment; or

          (ii) At the Borrower's election, so long as no Default then exists or
     would be caused thereby, by the Borrower or any Restricted Subsidiary to
     purchase one or more Allowable Wireless Systems, the aggregate purchase
     price of which does not exceed such Net Proceeds, or the sum of such Net
     Proceeds plus Advances otherwise available for Acquisitions hereunder plus
     other funds available to the Borrower, so long as the Borrower shall have
     (i) entered into a definitive contract for purchase within twelve (12)
     months from the date of such Permitted Asset Sale, and (ii) concluded such
     purchase within eighteen (18) months from the date of such Permitted Asset
     Sale. In the event the Borrower elects to exercise its right under this
     Section 2.8(b)(ii), the Borrower shall so notify the Administrative Agent
     not less than five (5) Business Days prior to the proposed date of the
     closing of the Permitted Asset Sale and shall, upon its or any Restricted
     Subsidiary's receipt of any Net Proceeds with respect to such Permitted
     Asset Sale, remit such Net Proceeds to the Administrative Agent to reduce
     the outstanding principal balance of the Revolving Loans (but not the Term
     Loans nor the amount of the Revolving Loan Commitment). Any amount in
     excess of the then outstanding balance of the Revolving Loans shall be held
     in trust in an interest-bearing account with the Administrative Agent or an
     Affiliate thereof (the "Net Proceeds Trust") for the benefit of the
     Borrower, to be applied to the ultimate purchase of the Allowable Wireless
     System or Systems, as hereinafter provided. Amounts in any Net Proceeds
     Trust shall also be subject to a valid and perfected first priority Lien in
     favor of the Administrative Agent (for itself and for the ratable benefit
     of the Lenders) to secure the Obligations, pursuant to a deposit pledge
     agreement or other security agreement in form and substance reasonably
     satisfactory to the Administrative Agent. The Borrower shall consummate
     such purchase of the 

                                       38


<PAGE>   40
     Allowable Wireless System or Systems not later than eighteen (18) months
     after the date of the applicable Permitted Asset Sale. To the extent that
     the Borrower shall not have entered into a definitive contract for purchase
     within twelve (12) months after the date of the Permitted Asset Sale, or
     consummated any such purchase as of eighteen (18) months after the date of
     such Permitted Asset Sale (for whatever reason, including the occurrence of
     a Default hereunder), or the purchase price of such purchase shall be less
     than the Net Proceeds of the Permitted Asset Sale, any funds held in the
     Net Proceeds Trust relating to such sale shall be applied in the manner set
     forth in Section 2.8(b)(i) hereof.

     Section 2.9 Notes; Loan Accounts.

     (a) The Loans shall be repayable in accordance with the terms and
provisions set forth herein, and shall be evidenced by the Notes. Term Notes
shall be issued by the Borrower and payable to the order of each Lender listed
as making a Tranche A Term Loan or a Tranche B Term Loan on Schedule 1 hereof,
and one Revolving Note shall be issued by the Borrower and payable to the order
of each Lender issuing a Revolving Loan Commitment. The Notes shall be issued by
the Borrower to the Lenders and shall be duly executed and delivered by one or
more Authorized Signatories.

     (b) Each Lender may open and maintain on its books in the name of the
Borrower a loan account with respect to such Lender's portion of the Loans and
interest thereon. Each Lender which opens such a loan account shall debit such
loan account for the principal amount of its portion of each Advance made and
accrued interest thereon and shall credit such loan account for each payment on
account of principal of or interest on its Loan. The records of a Lender with
respect to the loan account maintained by it shall be prima facie evidence of
the Loans and accrued interest thereon, absent manifest error, but the failure
of any Lender to make any such notations or any error or mistake in such
notations shall not affect the Borrower's repayment obligations with respect to
the Loans.


                                       39


<PAGE>   41
     Section 2.10 Manner of Payment.

     (a) Each payment (including any prepayment) by the Borrower on account of
the principal of or interest on the Loans, commitment fees and any other amount
owed to the Lenders, the Administrative Agent or any of them under this
Agreement or the Notes shall be made not later than 2:00 p.m. (Houston time) on
the date specified for payment under this Agreement to the Administrative Agent
at the Administrative Agent's Office, for the account of the Lenders, or the
Administrative Agent, as the case may be, in lawful money of the United States
of America in immediately available funds. Any payment received by the
Administrative Agent after 2:00 p.m. (Houston time) shall be deemed received on
the next Business Day. Receipt by the Administrative Agent of any payment
hereunder at or prior to 2:00 p.m. (Houston time) on any Business Day shall be
deemed to constitute receipt on such Business Day. In the case of a payment for
the account of a Lender, the Administrative Agent will promptly thereafter (and,
if such amount is received before 2:00 p.m. (Houston time), on the same day)
distribute the amount so received in like funds to such Lender. If the
Administrative Agent shall not have received any payment from the Borrower as
and when due, the Administrative Agent will promptly notify the Lenders
accordingly.

     (b) The Borrower agrees to pay principal, interest, fees and all other
Obligations due hereunder, under the Fee Letters, under the Notes, or under the
other Loan Documents without set-off or counterclaim or any deduction
whatsoever.

     (c) Prior to the acceleration of the Loans under Section 8.2 hereof, if
some but less than all amounts due from the Borrower are received by the
Administrative Agent with respect to the Obligations, the Administrative Agent
shall distribute such amounts in the following order of priority, all on a pro
rata basis to the Lenders: (i) to the payment on a pro rata basis of any fees or
expenses then due and payable to the Administrative Agent, the Lenders, or any
of them; (ii) to the payment of interest then due and payable on the Loans;
(iii) to the payment of all other amounts not otherwise referred to in this
Section 2.10(c) then due and payable to the Administrative Agent or the Lenders,
or any of them, hereunder or under the Notes; and (iv) to the payment of
principal then due and payable on the Notes.

     (d) Subject to any contrary provisions in the definition of Interest
Period, if any payment under this 


                                       40


<PAGE>   42
Agreement or any of the other Loan Documents is specified to be made on a day
which is not a Business Day, it shall be made on the next Business Day, and such
extension of time shall in such case be included in computing interest and fees,
if any, in connection with such payment.

     Section 2.11 Reimbursement.

     (a) Whenever any Lender shall sustain or incur any losses or out-of-pocket
expenses in connection with (i) failure by the Borrower to borrow any Eurodollar
Advance after having given notice of its intention to borrow in accordance with
Section 2.2 hereof (whether by reason of the Borrower's election not to proceed
or the non-fulfillment of any of the conditions set forth in Article 3), (ii)
prepayment of any Eurodollar Advance in whole or in part for any reason, or
(iii) failure by the Borrower to prepay any Eurodollar Advance after giving
notice of its intention to prepay such Advance, the Borrower agrees to pay to
such Lender, upon demand, an amount sufficient to compensate such Lender for all
such losses and reasonable out-of-pocket expenses. Such Lender's good faith
determination of the amount of such losses or out-of-pocket expenses, as set
forth in writing pursuant to Section 2.11(b) hereof, and accompanied by
calculations in reasonable detail demonstrating the basis for its demand, shall
be presumptively correct.

     (b) Losses subject to reimbursement hereunder shall be (i) any loss
incurred by any Lender in connection with the re-employment of funds prepaid,
repaid, not borrowed, or paid, as the case may be, and the amount of such loss
shall be the excess, if any, of (1) the interest or other cost to such Lender of
the deposit or other source of funding used to make any such Eurodollar Advance
for the remainder of its Interest Period, over (2) the interest earned (or to be
earned) by such Lender upon the re-lending or other redeployment of the amount
of such Eurodollar Advance for the remainder of its putative Interest Period or
(ii) any other expenses incurred by any Lender or any participant of such Lender
permitted hereunder in connection with the re-employment of funds prepaid,
repaid, not borrowed, or paid, as the case may be.

     Section 2.12 Pro Rata Treatment.

     (a) Advances. Each Advance of the Revolving Loans, the Tranche A Term Loans
or the Tranche B Term Loans from the Lenders shall be made pro rata on the basis
of the respective Commitment Ratios of the Lenders issuing and 


                                       41


<PAGE>   43
holding Commitments for such Loans, as set forth as of the Agreement Date on
Schedule 1 hereof with respect to the Lenders making Term Loans hereunder.

     (b) Payments. Except as provided in Section 2.2(e)(iv) or Article 10 hereof
or elsewhere in this Agreement, each payment and prepayment of principal of the
Loans, and each payment of interest on the Loans, shall be made to the Lenders
pro rata on the basis of their respective unpaid principal amounts outstanding
immediately prior to such payment or prepayment. If any Lender shall obtain any
payment (whether involuntary, through the exercise of any right of set-off, or
otherwise) on account of the Loans made by it in excess of its ratable share of
the Tranche A Loans, the Tranche B Term Loans, or the Revolving Loans, as the
case may be, such Lender shall forthwith purchase from the other Lenders such
interests (whether by purchasing a participation or by assignment) in the
applicable Loans made by them as shall be necessary to cause such purchasing
Lender to share the excess payment ratably with each of them; provided, however,
that if all or any portion of such excess payment is thereafter recovered from
such purchasing Lender, such purchase from each Lender shall be rescinded and
each such Lender shall repay to the purchasing Lender the purchase price to the
extent of such recovery. The Borrower agrees that any Lender so purchasing a
participation from another Lender pursuant to this Section 2.12(b) may, to the
fullest extent permitted by law, exercise all its rights of payment (including
the right of set-off) with respect to such participation as fully as if such
Lender were the direct creditor of the Borrower in the amount of such
participation.

     (c) Delayed Permitted Asset Sale Prepayment. In the event proceeds from a
Permitted Asset Sale are used to reduce the outstanding principal balance of the
Revolving Loans (but not the Revolving Loan Commitment) in accordance with
Section 2.8(b)(ii) hereof and the Borrower fails to enter into a definitive
contract for purchase of an Allowable Wireless System or Systems within twelve
(12) months from the date of the Permitted Asset Sale or the Borrower shall not
have consummated any such purchase as of eighteen (18) months after the date of
such Permitted Asset Sale (for whatever reason, including a Default hereunder),
or the purchase price of such purchase shall be less than the Net Proceeds of
the Permitted Asset Sale, the proceeds of such Permitted Asset Sale, or
applicable portion thereof, shall be reallocated on the date twelve (12) months
or eighteen (18) months after the Permitted Asset Sale (as applicable) on a pro
rata basis in the manner set forth in 


                                       42


<PAGE>   44
Section 2.8(b)(i) hereof as if such proceeds had been used to permanently reduce
the Revolving Loan Commitment and the outstanding principal balance of the Term
Loans upon receipt thereof by the Borrower.

     Section 2.13 Capital Adequacy. If, after the date hereof, the adoption of
any Applicable Law regarding the capital adequacy of banks or bank holding
companies, or any change in Applicable Law (whether adopted before or after the
Agreement Date) or any change in the interpretation or administration thereof by
any governmental authority, central bank or comparable agency charged with the
interpretation or administration thereof, or compliance by such Lender with any
directive issued or adopted after the date hereof regarding capital adequacy
(whether or not having the force of law) of any such governmental authority,
central bank or comparable agency, has or would have the effect of reducing the
rate of return on any Lender's capital as a consequence of its obligations
hereunder with respect to the Term Loans and the Revolving Loan Commitment to a
level below that which it could have achieved but for such adoption, change or
compliance (taking into consideration such Lender's policies with respect to
capital adequacy immediately before such adoption, change or compliance and
assuming that such Lender's capital was fully utilized prior to such adoption,
change or compliance) by an amount reasonably deemed by such Lender to be
material, then such Lender shall promptly notify the Borrower of such adoption,
compliance, or change. Upon demand by such Lender, the Borrower shall promptly
pay to such Lender such additional amounts as shall be sufficient to compensate
such Lender for such reduced return, together with interest on such amount from
the fourth (4th) day after the date of demand until payment in full thereof at
the Default Rate. A certificate of such Lender setting forth the amount to be
paid to such Lender by the Borrower as a result of any event referred to in this
paragraph and supporting calculations in reasonable detail shall be conclusive,
absent manifest error.

     Section 2.14 Lender Tax Forms. On or prior to the first Payment Date
hereunder and on or prior to the first Business Day of each calendar year
thereafter, each Lender which is organized in a jurisdiction other than the
United States or a political subdivision thereof shall provide each of the
Administrative Agent and the Borrower with either (a) two (2) properly executed
originals of Form 4224 or Form 1001 (or any successor forms) prescribed by the
Internal Revenue Service or other documents satisfactory to the Borrower and the
Administrative Agent, and properly executed 


                                       43


<PAGE>   45
Internal Revenue Service Form W-8 or Form W-9, as the case may be, certifying
(i) as to such Lender's status for purposes of determining exemption from United
States withholding taxes with respect to all payments to be made to such Lender
hereunder and under the Notes or (ii) that all payments to be made to such
Lender hereunder and under the Notes are subject to such taxes at a rate reduced
to zero by an applicable tax treaty, or (b)(i) a certificate executed by such
Lender certifying that such Lender is not a "bank" and that such Lender
qualifies for the portfolio interest exemption under Section 881(c) of the
Internal Revenue Code of 1986, as amended, and (ii) two (2) properly executed
originals of Internal Revenue Service Form W-8 (or any successor form)
prescribed certifying such Lender's entitlement to an exemption from United
States withholding tax with respect to payments of interest to be made under
this Agreement and under any Note. Each such Lender agrees to provide the
Administrative Agent and the Borrower with new forms prescribed by the Internal
Revenue Service upon the expiration or obsolescence of any previously delivered
form, or after the occurrence of any event requiring a change in the most recent
forms delivered by it to the Administrative Agent and the Borrower.

                                    ARTICLE 3

                              Conditions Precedent

     Section 3.1 Conditions Precedent to Initial Advance. The obligation of the
Lenders to make the initial Advance hereunder is subject to the prior
fulfillment of each of the following conditions:

     (a) The Administrative Agent shall have received each of the following
(with sufficient copies for each of the Lenders), in form and substance
satisfactory to the Administrative Agent and each of the Lenders:

          (i) the loan certificate of the Borrower, in substantially the form
     attached hereto as Exhibit O, including a certificate of incumbency with
     respect to each Authorized Signatory, together with appropriate attachments
     which shall include without limitation, the following items: (A) a copy of
     the certificate of incorporation of the Borrower, certified to be true,
     complete and correct by the Secretary of State of Delaware, and a true,
     complete and correct copy of the by-laws of the Borrower, (B) certificates
     of good standing for the Borrower issued by the Secretary of State or
     similar state official for each state in which 


                                       44


<PAGE>   46
     the Borrower is required to qualify or has qualified to do business, (C) a
     true, complete and correct copy of the appropriate authorizing resolutions
     of the Borrower, authorizing the Borrower to execute, deliver and perform
     this Agreement and the other Loan Documents to which it is a party, and (D)
     a true, complete and correct copy of any agreement in effect with respect
     to the voting rights, ownership interests, or management of the Borrower;

          (ii) duly executed Notes and Fee Letters;

          (iii) duly executed Borrower's Pledge Agreement, together with
     appropriate stock certificates and undated stock powers executed in blank;

          (iv) duly executed Security Agreement, together with evidence of the
     filing of appropriate UCC-1 financing statement forms;

          (v) duly executed Subsidiary Security Agreement, executed and
     delivered by each Restricted Subsidiary of the Borrower, together with
     evidence of the filing of appropriate UCC-l financing statement forms;

          (vi) copies of insurance binders or certificates covering the assets
     of the Borrower and its Restricted Subsidiaries, and otherwise meeting the
     requirements of Section 5.5 hereof;

          (vii) legal opinions of (i) Rubin Baum Levin Constant & Friedman,
     general counsel to the Borrower, and (ii) Gurman, Blask & Freedman, FCC
     counsel to the Borrower and its Restricted Subsidiaries; each as counsel to
     the Borrower and its Restricted Subsidiaries, addressed to each Lender and
     the Administrative Agent, in form and substance satisfactory to the
     Administrative Agent and its special counsel, and dated as of the Agreement
     Date;

          (viii) duly executed Request for Advance for the initial Advance of 
      the Loans, which Request for Advance shall include calculations
     demonstrating, as of the Agreement Date, the Borrower's compliance with the
     Financial Covenants hereof;

          (ix) duly executed Use of Proceeds Letter;

          (x) duly executed Certificate of Financial Condition for the Borrower
     and its Restricted 


                                       45


<PAGE>   47
     Subsidiaries on a consolidated basis, given by the chief financial officer
     of the Borrower which shall include a certification that no event has
     occurred which could have a Materially Adverse Effect since December 31,
     1997;

          (xi) any required FCC consents, Necessary Authorizations (except as
     may be referred to in any Schedules hereto), or other required consents to
     the closing of this Agreement or to the execution, delivery and performance
     of this Agreement and the other Loan Documents;

          (xii) duly executed Subsidiary Pledge Agreement from each Restricted
     Subsidiary of the Borrower which has one or more corporate Restricted
     Subsidiaries together with appropriate stock certificates and undated stock
     powers executed in blank;

          (xiii) duly executed Subsidiary Guaranty executed and delivered by
     each Restricted Subsidiary of the Borrower;

          (xiv) a loan certificate from each Restricted Subsidiary of the
     Borrower, in substantially the form attached hereto as Exhibit P, with
     respect to corporations, and Exhibit Q, with respect to partnerships,
     including a certificate of incumbency with respect to each officer or
     partner authorized to execute Loan Documents on behalf of such Subsidiary,
     together with appropriate attachments which shall include, without
     limitation, the following items, if a corporation, and the analogous items,
     if a partnership: (A) a copy of the certificate or articles of
     incorporation of such Restricted Subsidiary, certified to be true, complete
     and correct by the Secretary of State from the jurisdiction of
     incorporation of such Restricted Subsidiary, (B) certificates of good
     standing for such Restricted Subsidiary issued by the Secretary of State or
     similar state official for each state in which such Restricted Subsidiary
     is incorporated or required to qualify to do business, (C) a true, complete
     and correct copy of the By-Laws of such Restricted Subsidiary, and (D) a
     true, complete and correct copy of the resolutions of such Restricted
     Subsidiary authorizing it to execute, deliver and perform the Loan
     Documents to which it is a party;

          (xv) duly executed VoiceStream Guaranty;


                                       46


<PAGE>   48
          (xvi) duly executed VoiceStream Pledge Agreement pledging the stock of
     the Borrower together with appropriate stock certificates and undated stock
     powers executed in blank;

          (xvii) copies of payoff letters and duly executed Lien releases with
     respect to the Nortel Debt and associated Liens, and with respect to any
     other Liens which are not Permitted Liens hereunder upon the assets of the
     Borrower and its Restricted Subsidiaries, and with respect to any other
     Indebtedness which is not Permitted Debt hereunder; and

          (xvii) all such other documents as either the Administrative Agent or
     any Lender may reasonably request, certified by an appropriate governmental
     official or an Authorized Signatory if so requested.

     (b) The Administrative Agent shall have received evidence satisfactory to
it that all Necessary Authorizations, including all necessary consents to the
execution, delivery and performance by the Borrower of this Agreement and the
other Loan Documents to which it is a party and by the Restricted Subsidiaries
of the Loan Documents to which they are parties, have been obtained or made, are
in full force and effect and are not subject to any pending or threatened
reversal or cancellation, and the Administrative Agent shall have received a
certificate of an Authorized Signatory so stating.

     (c) The Lenders, the Administrative Agent, and Paul, Hastings, Janofsky &
Walker LLP, special counsel to the Administrative Agent, shall receive payment
of all fees and expenses due and payable on the Agreement Date in respect of the
transactions contemplated hereby.

     (d) The Administrative Agent shall have received the Borrower's ten-year
projections, with quarterly projections for not less than the first five (5)
years of this Agreement.

     (e) The Administrative Agent shall have received a certificate of the chief
financial officer of the Borrower satisfactory to it that the Borrower has
received Contributed Capital of $994,750,000 on or prior to the Agreement Date.

     (f) The Administrative Agent and the Lenders shall have received evidence
satisfactory to them that, after funding the initial Advance of the Loans, the
Borrower has 


                                       47


<PAGE>   49
no outstanding Indebtedness for Money Borrowed other than amounts within the
Basket.

     (g) The Administrative Agent and the Lenders shall be satisfied with the
capital and corporate structure of the Borrower and its Subsidiaries, including
its Restricted Subsidiaries, its Unrestricted Subsidiaries, and its Investments.

     Section 3.2 Conditions Precedent to Each Advance. The obligation of the
Lenders to make each Advance (including the initial Advance hereunder) is
subject to the fulfillment of each of the following conditions immediately prior
to or contemporaneously with such Advance:

     (a) All of the representations and warranties of the Borrower and the
Restricted Subsidiaries under this Agreement and the other Loan Documents
(including, without limitation, all representations and warranties with respect
to the Borrower's Subsidiaries), which, pursuant to Section 4.2 hereof, are made
at and as of the time of such Advance, shall be true and correct at such time in
all material respects, both before and after giving effect to the application of
the proceeds of such Advance, and after giving effect to any updates to
information provided to the Lenders in accordance with the terms of such
representations and warranties, and no Default hereunder shall then exist or be
caused thereby;

     (b) With respect to Advances which, if funded, would increase the aggregate
principal amount of Loans outstanding hereunder, the Administrative Agent shall
have received a duly executed Request for Advance and in the case of other
Advances, notice as required by Article 2 hereof;

     (c) Each of the Administrative Agent and the Lenders shall have received
all such other certificates, reports, statements, opinions of counsel or other
documents as the Administrative Agent or any Lender may reasonably request;

     (d) With respect to any Advance relating to any Acquisition, Investment or
the formation of any Restricted Subsidiary which is permitted hereunder, the
Administrative Agent and the Lenders shall have received such documents and
instruments relating to such Acquisition, Investment, or formation of a new
Restricted Subsidiary as are described in Section 5.13 hereof or otherwise
required herein; and

     (e) There shall have occurred no event which could have a Materially
Adverse Effect.


                                       48


<PAGE>   50
     Section 3.3 Conditions Precedent to Initial Advance of the Revolving Loans.
The obligation of the Lenders to make the Initial Advance under the Revolving
Loan Commitment is subject to (i) the Administrative Agent's prior receipt of
evidence satisfactory to it that the Minimum Additional Contributed Capital
shall have been received by the Borrower, and (ii) the Term Loans hereunder
being fully drawn.

                                    ARTICLE 4

                         Representations and Warranties

     Section 4.1 Representations and Warranties. The Borrower hereby agrees,
represents and warrants in favor of the Administrative Agent and each Lender
that:

     (a) Organization; Ownership; Power; Qualification. The Borrower is a
corporation duly organized, validly existing and in good standing under the laws
of the jurisdiction of its incorporation, having VoiceStream as its only
shareholder of record as of the Agreement Date. The Borrower has the corporate
power and authority to own its properties and to carry on its business as now
being and hereafter proposed to be conducted. Each Subsidiary of the Borrower is
a corporation or a partnership duly organized, validly existing and in good
standing under the laws of the state of its incorporation or formation, and has
the corporate or partnership power and authority, as the case may be, to own its
properties and to carry on its business as now being and hereafter proposed to
be conducted. The Borrower and each of its Subsidiaries are duly qualified, in
good standing and authorized to do business in each jurisdiction in which the
character of their respective properties or the nature of their respective
businesses makes such qualification or authorization prudent.

     (b) Authorization; Enforceability. The Borrower has the corporate power and
has taken all necessary action to authorize it to borrow hereunder, to execute,
deliver and perform this Agreement and each of the other Loan Documents to which
it is a party in accordance with their respective terms, and to consummate the
transactions contemplated hereby and thereby. This Agreement has been duly
executed and delivered by the Borrower and is, and each of the other Loan
Documents to which the Borrower is party is, a legal, valid and binding
obligation of the Borrower enforceable against the Borrower in accordance with
its terms, subject, as to enforcement of remedies, to the following
qualifications: (i) an order of specific performance and an 


                                       49


<PAGE>   51
injunction are discretionary remedies and, in particular, may not be available
where damages are considered an adequate remedy at law, (ii) enforcement may be
limited by bankruptcy, insolvency, liquidation, reorganization, reconstruction
and other similar laws affecting enforcement of creditors' rights generally
(insofar as any such law relates to the bankruptcy, insolvency or similar event
of the Borrower), and (iii) enforcement may be subject to general principles of
equity (regardless of whether such enforcement is considered in a proceeding in
equity or at law) and may be limited by public policies which may affect the
enforcement of certain rights or remedies provided for in this Agreement or the
Security Documents.

     (c) Subsidiaries; Authorization; Enforceability. The Borrower's
Subsidiaries (including its Unrestricted Subsidiaries) and Investments and its
direct and indirect ownership thereof are set forth as of the Agreement Date on
Schedule 4 attached hereto, and the Borrower has the unrestricted right to vote
the issued and outstanding shares of the corporate Subsidiaries, and the right
to vote its partnership interests in the partnership Subsidiaries in accordance
with the terms of the applicable partnership agreement, shown thereon; such
shares of such corporate Subsidiaries have been duly authorized and issued and
are fully paid and nonassessable. Each Subsidiary of the Borrower has the
corporate or partnership power and authority, as the case may be, and has taken
all necessary corporate or partnership action to authorize it to execute,
deliver and perform each of the Loan Documents to which it is a party in
accordance with their respective terms and to consummate the transactions
contemplated by this Agreement and by such Loan Documents. Each of the Loan
Documents to which any Subsidiary of the Borrower is party is a legal, valid and
binding obligation of such Subsidiary enforceable against such Subsidiary in
accordance with its terms, subject, as to enforcement of remedies, to the
following qualifications: (i) an order of specific performance and an injunction
are discretionary remedies and, in particular, may not be available where
damages are considered an adequate remedy at law, (ii) enforcement may be
limited by bankruptcy, insolvency, liquidation, reorganization, reconstruction
and other similar laws affecting enforcement of creditors' rights generally
(insofar as any such law relates to the bankruptcy, insolvency or similar event
of such Subsidiary), and (iii) enforcement may be subject to general principles
of equity (regardless of whether such enforcement is considered in a proceeding
in equity or at law) and may be limited by public policies which may affect 


                                       50


<PAGE>   52
the enforcement of certain rights or remedies provided for in such Loan
Documents.

     (d) Compliance with Other Loan Documents and Contemplated Transactions. The
execution, delivery and performance, in accordance with their respective terms,
by the Borrower of this Agreement and the Notes, and by the Borrower and its
Subsidiaries of each of the other Loan Documents to which they are respectively
party, and the consummation of the transactions contemplated hereby and thereby,
do not and will not (i) require any consent or approval, governmental or
otherwise, not already obtained, (ii) violate any Applicable Law respecting the
Borrower or any Subsidiary of the Borrower, (iii) conflict with, result in a
breach of, or constitute a default under the certificate or articles of
incorporation or by-laws, or the partnership agreement, as the case may be, as
such documents are amended, of the Borrower or of any Subsidiary of the
Borrower, or under any material indenture, agreement, or other instrument, to
which the Borrower or any of its Subsidiaries is a party or by which any of them
or their respective properties may be bound, (iv) conflict with, result in a
breach of, or constitute a default or violation of, the terms and conditions of
any of the material Licenses, or (v) result in or require the creation or
imposition of any Lien upon or with respect to any property now owned or
hereafter acquired by the Borrower or any of its Subsidiaries, except for
Permitted Liens.

     (e) Business. The Borrower is a holding company for all its Subsidiaries
and the Borrower, together with its Restricted Subsidiaries, is engaged in the
business of owning, operating, and investing in PCS Systems or otherwise
providing wireless communications or telecommunications services and in related
business activities.

     (f) Licenses, Etc. The Licenses, as well as the Licenses held by
Unrestricted Subsidiaries, have been duly authorized by the grantors thereof and
are in full force and effect. The Borrower and its Subsidiaries are in
compliance in all material respects with all of the provisions thereof. Except
as set forth on Schedule 5 attached hereto, the Borrower and its Subsidiaries
have secured all material Licenses and Necessary Authorizations and all such
material Licenses and Necessary Authorizations are in full force and effect.
Except as set forth on Schedule 5 attached hereto, neither any material License
nor any material Necessary Authorization is the subject of any pending or, to
the best of the Borrower's knowledge, threatened revocation. For purposes of
this Section 4.1(f), "Licenses" shall mean and 


                                       51


<PAGE>   53
include Licenses of Unrestricted Subsidiaries, each of which shall be listed as
of the Agreement Date on Schedule 2 attached hereto.

     (g) Compliance with Law. The Borrower and its Subsidiaries are in
substantial compliance with all material Applicable Law.

     (h) Title to Assets. The Borrower has good, legal and marketable title to,
or a valid leasehold interest in, all of its assets. Each of the Borrower's
Subsidiaries has good, legal and marketable title to, or a valid leasehold
interest in, all of its assets. None of such properties or assets held by the
Borrower or any of its Restricted Subsidiaries is subject to any Liens, except
for Permitted Liens, and for financing statements securing the Nortel Debt for
which duly executed terminations have been presented as of the Agreement Date.
Except for financing statements evidencing Permitted Liens, or financing
statements securing the Nortel Debt for which duly executed terminations have
been presented as of the Agreement Date, no financing statement under the
Uniform Commercial Code as in effect in any jurisdiction and no other filing
which names the Borrower or any of its Restricted Subsidiaries as debtor or
which covers or purports to cover any of the assets of the Borrower or any of
its Restricted Subsidiaries is currently effective and on file in any state or
other jurisdiction, and neither the Borrower nor any of its Restricted
Subsidiaries has signed any such financing statement or filing or any security
agreement authorizing any secured party thereunder to file any such financing
statement or filing.

     (i) Litigation. There is no action, suit, revocation, proceeding or
investigation pending against, or, to the best of the Borrower's knowledge,
threatened against or in any other manner relating adversely to, the Borrower or
any of its Subsidiaries or any of their respective properties, including without
limitation any License or Necessary Authorization, in any court or before any
arbitrator of any kind or before or by any governmental body (including without
limitation the FCC), except as described on Schedule 6 attached hereto as of the
Agreement Date or as subsequently disclosed to the Administrative Agent and the
Lenders pursuant to Section 6.5 hereof; and, except as expressly set forth on
Schedule 6 (or if disclosed pursuant to Section 6.5), no such action, suit,
proceeding or investigation could reasonably be expected to have an adverse
outcome which (i) calls into question the validity of this Agreement or any
other Loan Document, (ii) 


                                       52


<PAGE>   54
challenges the continued possession and use of any License granted by the FCC,
by the Borrower, any of its Subsidiaries, or any Person in which the Borrower
has, directly or indirectly, an Investment and such challenge could result in a
Default pursuant to Section 8.1(l) or Section 8.1(m) hereof, or (iii) could have
a Materially Adverse Effect.

     (j) Taxes. All federal, state and other tax returns (including information
returns) of the Borrower and each of its Subsidiaries required by law to be
filed have been duly filed and all federal, state and other taxes, including,
without limitation, withholding taxes, assessments and other governmental
charges or levies required to be paid by the Borrower or any of its Subsidiaries
or imposed upon the Borrower or any of its Subsidiaries or any of their
respective properties, income, profits or assets, which are due and payable,
have been paid, except any such taxes (i) the payment of which the Borrower or
any of its Subsidiaries is diligently contesting in good faith by appropriate
proceedings, (ii) for which adequate reserves have been provided on the books of
the Borrower or the Subsidiary of the Borrower involved, and (iii) as to which
no Lien other than a Permitted Lien has attached and no foreclosure, distraint,
sale or similar proceedings have been commenced. The charges, accruals and
reserves on the books of the Borrower and each of its Subsidiaries in respect of
taxes are, in the judgment of the Borrower, adequate.

     (k) Financial Statements. The Borrower has furnished or caused to be
furnished to the Administrative Agent and the Lenders its unaudited balance
sheet dated the Agreement Date, audited financial statements on a consolidated
basis for VoiceStream and its Subsidiaries for the fiscal year ended December
31, 1997, which, together with other financial statements furnished to the
Administrative Agent and the Lenders subsequent to the Agreement Date, are
complete and correct in all material respects and present fairly in accordance
with GAAP the financial position of the Borrower and its Subsidiaries on a
consolidated basis on and as at such dates and the results of operations for the
periods then ended. Except as provided on Schedule 7 attached hereto, neither
the Borrower nor any of its Subsidiaries has any material liabilities,
contingent or otherwise, other than as disclosed in the financial statements
referred to in the preceding sentence or as set forth or referred to in this
Agreement, and there are no material unrealized losses of the Borrower or any of
its Subsidiaries and no anticipated losses of the Borrower or any of its
Subsidiaries other than those which have been 


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<PAGE>   55
disclosed in writing to the Administrative Agent and the Lenders prior to the
Agreement Date and identified as such.

     (l) No Adverse Change. Since December 31, 1997, there has occurred no event
which has had or which could have a Materially Adverse Effect.

     (m) ERISA. The Borrower and each Subsidiary of the Borrower and each of
their respective Plans are in compliance in all material respects with ERISA and
the Code and neither the Borrower nor any of its Subsidiaries has incurred any
accumulated funding deficiency with respect to any such Plan within the meaning
of ERISA or the Code. The Borrower, each of its Subsidiaries, and each other
ERISA Affiliate have complied with all requirements of Sections 10001 and 10002
of the Consolidated Omnibus Budget Reconciliation Act of 1985 (Public Law No.
99-272), Section 4980B of the Internal Revenue Code. Neither the Borrower nor
any of its Subsidiaries has made any promises of retirement or other benefits to
employees, except as set forth in their respective Plans, in written agreements
with such employees, or in the Borrower's employee handbook and memoranda to
employees. Neither the Borrower nor any of its Subsidiaries has incurred any
material liability to PBGC in connection with any such Plan. The assets of each
such Plan subject to Title IV of ERISA are sufficient to provide the benefits
under such Plan. Such assets are also sufficient to provide all other "benefit
liabilities" (as defined in Section 9313(a) of the Pension Protection Act
included in the Omnibus Budget Reconciliation Act of 1987, Pub. L-100-203),
Section 4001A(16) of ERISA, due under the Plan upon termination. No Reportable
Event has occurred and is continuing with respect to any such Plan. No such Plan
or trust created thereunder, or party in interest (as defined in Section 3(14)
of ERISA), or any fiduciary (as defined in Section 3(21) of ERISA), has engaged
in a "prohibited transaction" (as such term is defined in Section 406 of ERISA
or Section 4975 of the Code) which would subject such Plan or any other Plan of
the Borrower or any of its Subsidiaries, any trust created thereunder, or any
such party in interest or fiduciary, or any party dealing with any such Plan or
any such trust, to the tax or penalty in any material amount on "prohibited
transactions" imposed by Section 502 of ERISA or Section 4975 of the Code.
Neither the Borrower nor any of its Subsidiaries is a participant in or is
obligated to make any payment to a Multiemployer Plan. Neither the Borrower nor
any of its Subsidiaries (1) has had either a complete withdrawal or a partial
withdrawal under Section 4201 et. seq. of ERISA from a Multiemployer Plan which
had "unfunded vested benefits" within the meaning of 


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<PAGE>   56
Section 4211 of ERISA or (2) has ever received a notice and demand from the plan
sponsor of a Multiemployer Plan under Section 4219(b)(1) of ERISA.

     (n) Compliance with Regulations G, T, U, and X. Neither the Borrower nor
any Subsidiary of the Borrower is engaged principally in or has as one of its
important activities the business of purchasing or carrying, or extending credit
for the purpose of purchasing or carrying, any margin stock within the meaning
of Regulations G, T, U, and X of the Board of Governors of the Federal Reserve
System; nor will any proceeds of the Loans be used for such purpose.

     (o) Investment Company Act. Neither the Borrower nor any of its
Subsidiaries is required to register under the provisions of the Investment
Company Act of 1940, as amended, and neither the entering into or performance by
the Borrower and its Subsidiaries of this Agreement nor the issuance of the
Notes violates any provision of such Act or requires any consent, approval or
authorization of, or registration with, the Securities and Exchange Commission
or any other governmental or public body or authority pursuant to any provisions
of such Act.

     (p) Governmental Regulation. Neither the Borrower nor any of its
Subsidiaries is required to obtain any consent, approval, authorization, permit
or license which has not already been obtained from, or effect any filing or
registration which has not already been effected with, any federal, state or
local regulatory authority in connection with the execution and delivery of this
Agreement. Neither the Borrower nor any of its Subsidiaries is required to
obtain any consent, approval, authorization, permit or license which has not
already been obtained from, or effect any filing or registration which has not
already been effected with, any federal, state or local regulatory authority in
connection with the performance, in accordance with their respective terms, of
this Agreement or any other Loan Document.

     (q) Absence of Default, Etc. The Borrower and its Subsidiaries are in
compliance in all respects with all of the provisions of their respective
certificates or articles of incorporation and by-laws, or their partnership
agreements, as the case may be, and no event has occurred or failed to occur
(including, without limitation, any matter which could create a Default
hereunder by cross-default) which has not been remedied or waived, the
occurrence or non-occurrence of which constitutes, or with the passage of 


                                       55


<PAGE>   57
time or giving of notice or both would constitute, (i) an Event of Default or
(ii) a material default by the Borrower or any of its Subsidiaries under any
indenture, agreement or other instrument relating to Indebtedness of the
Borrower or any of its Subsidiaries in the amount of $1,000,000 or more, any
License, or any judgment, decree or order in the amount of $1,000,000 or more to
which the Borrower or any of its Subsidiaries is a party or by which the
Borrower or any of its Subsidiaries or any of their respective properties may be
bound or affected. Neither the Borrower nor any of its Subsidiaries is a party
to or bound by any contract or agreement continuing after the Agreement Date, or
bound by any Applicable Law, that could have a Materially Adverse Effect or
result in the loss of any License issued by the FCC.

     (r) Accuracy and Completeness of Information. All information, reports,
prospectuses and other papers and data relating to the Borrower or any of its
Subsidiaries and furnished by or on behalf of the Borrower or any of its
Subsidiaries to the Administrative Agent or the Lenders were, at the time
furnished, true, complete and correct in all material respects to the extent
necessary to give the Administrative Agent and the Lenders true and accurate
knowledge of the subject matter. No fact or situation is currently known to the
Borrower which has had or could have a Materially Adverse Effect other than any
fact or situation known to and affecting the cellular telephone, PCS or
telecommunications industry generally.

     (s) Agreements with Affiliates and Management Agreements. Except as set
forth on Schedule 8 attached hereto, neither the Borrower nor any of its
Subsidiaries has (i) to the best of its knowledge, any written agreements or
binding arrangements of any kind with any Affiliate or (ii) any material
management or consulting agreements of any kind, not entered into in the
ordinary course of business.

     (t) Payment of Wages. The Borrower and each of its Subsidiaries are in
compliance with the Fair Labor Standards Act, as amended, in all material
respects, and the Borrower and each of its Subsidiaries have paid all minimum
and overtime wages required by law to be paid to their respective employees.

     (u) Priority. The Security Interest is a valid and perfected first priority
security interest in the Collateral in favor of the Administrative Agent, for
itself and for the ratable benefit of the Lenders, securing, in accordance with
the terms of the Security Documents, the outstanding 


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<PAGE>   58
Obligations, and the Collateral is subject to no Liens other than Permitted
Liens. The Liens created by the Security Documents are enforceable as security
for the outstanding Obligations in accordance with their terms with respect to
the Collateral subject, as to enforcement of remedies, to the following
qualifications: (i) an order of specific performance and an injunction are
discretionary remedies and, in particular, may not be available where damages
are considered an adequate remedy at law, (ii) enforcement may be limited by
bankruptcy, insolvency, liquidation, reorganization, reconstruction and other
similar laws affecting enforcement of creditors' rights generally (insofar as
any such law relates to the bankruptcy, insolvency or similar event of the
Borrower or any of its Restricted Subsidiaries, as the case may be), and (iii)
enforcement may be subject to general principles of equity (regardless of
whether such enforcement is considered in a proceeding in equity or at law) and
may be limited by public policies which may affect the enforcement of certain
rights or remedies provided for in such Loan Documents.

     (v) Indebtedness. Except as permitted pursuant to Section 7.1 hereof,
neither the Borrower nor any of its Restricted Subsidiaries has outstanding, as
of the Agreement Date, and after giving effect to the initial Advance hereunder
on the Agreement Date, any Indebtedness for Money Borrowed.

     (w) Investments. All Investments of the Borrower and its Subsidiaries are
shown as of the Agreement Date on Schedule 4 attached hereto.

     (x) Real Estate. Other than as listed and described on Schedule 9 attached
hereto, (i) neither the Borrower nor any of its Restricted Subsidiaries owns any
real property, and (ii) no single parcel of such real estate has a fair market
value on the Agreement Date in excess of $500,000.

     (y) Year 2000 Problem. The Borrower has (i) initiated a review and
assessment of all areas within its and each of its Subsidiaries' business and
operations (including those affected by suppliers, vendors and customers) that
could be adversely affected by the "Year 2000 Problem" (that is, the risk that
computer applications used by the Borrower or any of its Subsidiaries (or
suppliers, vendors and customers) may be unable to recognize and perform
properly date-sensitive functions involving certain dates prior to and any date
after December 31, 1999), (ii) developed a plan and timeline for addressing the
Year 2000 Problem on a timely basis, and (iii) to date, implemented that plan in


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<PAGE>   59
accordance with that timetable. Based on the foregoing, the Borrower believes
that all computer applications (including those of its suppliers, vendors and
customers) that are material to its or any of its Subsidiaries' business and
operations are reasonably expected on a timely basis to be able to perform
properly date-sensitive functions for all dates before and after January 1,
2000.

     (z) Intellectual Property. The Borrower and its Restricted Subsidiaries
own, possess or have the right to use all material licenses and rights to all
patents, trademarks, trademark rights, trade names, trade name rights, service
marks and copyrights necessary to conduct their business in all material
respects as now conducted, without known conflict with any patent, trademark,
trade name, service mark, license or copyright of any other Person, and such
intellectual property of the Borrower and its Restricted Subsidiaries is subject
to no Lien, other than any Permitted Liens. All such licenses and rights with
respect to patents, trademarks, trademark rights, trade names, trade name
rights, service marks and copyrights are in full force and effect in all
material respects, and are not subject to any pending or, to the best knowledge
of the Borrower, threatened attack or revocation.

     Section 4.2 Survival of Representations and Warranties, etc. All
representations and warranties made under this Agreement and the other Loan
Documents shall be deemed to be made, and shall be true and correct, at and as
of the Agreement Date and on the date of each Advance except to the extent
expressly applicable only to the Agreement Date or previously fulfilled in
accordance with the terms hereof. All representations and warranties made under
this Agreement shall survive, and not be waived by, the execution hereof by the
Lenders and the Administrative Agent, any investigation or inquiry by any Lender
or the Administrative Agent, or the making of any Advance under this Agreement.

                                    ARTICLE 5

                                General Covenants

     So long as any of the Obligations is outstanding and unpaid or the Borrower
shall have the right to borrow hereunder (whether or not the conditions to
borrowing have been or can be fulfilled), and unless the Majority Lenders, or
such greater number of Lenders as may be expressly provided herein, shall
otherwise consent in writing:


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<PAGE>   60
     Section 5.1 Preservation of Existence and Similar Matters. The Borrower
will, and will cause each of its Restricted Subsidiaries to:

     (a) preserve and maintain its existence, rights, franchises, licenses and
privileges in the state of its incorporation and in each other state in which it
operates a material part of its business, including, without limitation, the
Licenses (in accordance with their respective terms) and all other Necessary
Authorizations (other than any such the loss of which would not be materially
disadvantageous to (i) the Lenders or (ii) the Borrower and its Subsidiaries,
taken as a whole); and

     (b) qualify and remain qualified and authorized to do business in each
jurisdiction in which the character of its properties or the nature of its
business makes such qualification or authorization prudent.


     Section 5.2 Business; Compliance with Applicable Law. The Borrower will,
and will cause each of its Restricted Subsidiaries to, (a) engage in the
business of owning, operating and Investing in PCS Systems or otherwise
providing wireless communication or telecommunication services and in related
business activities, and (b) substantially comply with the requirements of all
material Applicable Law.

     Section 5.3 Maintenance of Properties. The Borrower will, and will cause
each of its Restricted Subsidiaries to, maintain or cause to be maintained in
the ordinary course of business in good repair, working order and condition
(reasonable wear and tear excepted) all properties used in their respective
businesses (whether owned or held under lease), and from time to time make or
cause to be made all needed and appropriate repairs, renewals, replacements,
additions, betterments and improvements thereto.

     Section 5.4 Accounting Methods and Financial Records. The Borrower will,
and will cause each of its Subsidiaries on a consolidated basis to, maintain a
system of accounting established and administered in accordance with GAAP, keep
adequate records and books of account in which complete entries will be made in
accordance with GAAP and reflecting all transactions required to be reflected by
GAAP and keep accurate and complete records of their respective properties and
assets. The Borrower and its Subsidiaries will maintain a fiscal year ending on
December 31.


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<PAGE>   61
     Section 5.5 Insurance. The Borrower will, and will cause each of its
Restricted Subsidiaries to:

     (a) Maintain insurance including, but not limited to, business interruption
coverage and public liability coverage insurance from responsible companies in
such amounts and against such risks to the Borrower and each of its Restricted
Subsidiaries as is prudent and satisfactory to the Administrative Agent
(including, without limitation, larceny, embezzlement, employee fidelity, and
other criminal misappropriation insurance).

     (b) Keep their respective assets insured by responsible companies on terms
and in a manner reasonably acceptable to the Administrative Agent against loss
or damage by fire, theft, burglary, pilferage, loss in transit, explosions and
hazards insured against by extended coverage, in amounts which are prudent for
the wireless telecommunications industry, in accordance with industry standards,
and satisfactory to the Administrative Agent, all premiums thereon to be paid by
the Borrower and its Restricted Subsidiaries.

     (c) Require that each insurance policy for the Borrower and its Restricted
Subsidiaries provide for at least thirty (30) days' prior written notice to the
Administrative Agent of any termination of or proposed cancellation or
nonrenewal of such policy, or material reduction in coverage, and name the
Administrative Agent (for itself and for the ratable benefit of the Lenders) as
additional named loss payee to the extent of the Obligations and additional
named insured.

     (d) Subject to subsection (e), below, Net Proceeds of insurance for the
Borrower and its Restricted Subsidiaries paid to the Administrative Agent shall
be applied to the payment or prepayment of the Obligations as provided under
Section 2.10(c) or Section 8.3 hereof, as applicable. Any balance thereof
remaining after payment in full of the Obligations shall be paid to the Borrower
or as otherwise required by law.

     (e) If the Borrower or any one or more of its Restricted Subsidiaries shall
be entitled to receive proceeds from any policy of insurance in an amount less
than $2,500,000, then the Borrower or such Restricted Subsidiary shall have the
right to elect either to use such proceeds to repair or rebuild the affected PCS
System or to remit such proceeds to the Administrative Agent as provided under
Section 5.5(b) hereof. In the event such insurance proceeds 


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<PAGE>   62
exceed such threshold, the Administrative Agent shall hold such proceeds pending
its receipt from the Borrower of a plan for the use of such proceeds and the
approval of such plan by the Majority Lenders.

     Section 5.6 Payment of Taxes and Claims. The Borrower will, and will cause
each of its Restricted Subsidiaries to, pay and discharge all taxes, including,
without limitation, withholding taxes, assessments and governmental charges or
levies required to be paid by them or imposed upon them or their income or
profits or upon any properties belonging to them, prior to the date on which
penalties attach thereto, and all lawful claims for labor, materials and
supplies which, if unpaid, might become a Lien or charge upon any of their
properties; except that no such tax, assessment, charge, levy or claim need be
paid which is being diligently contested in good faith by appropriate
proceedings and for which adequate reserves shall have been set aside on the
appropriate books, but only so long as such tax, assessment, charge, levy or
claim does not become a Lien or charge other than a Permitted Lien and no
foreclosure, distraint, sale or similar proceedings shall have been commenced.
The Borrower will, and will cause each of its Restricted Subsidiaries to, timely
file all information returns required by federal, state or local tax
authorities.

     Section 5.7 Visits and Inspections. The Borrower will, and will cause each
of its Restricted Subsidiaries to, permit representatives of the Administrative
Agent and any of the Lenders, upon reasonable notice to the Borrower or such
Restricted Subsidiary and during normal business hours (i) visit and inspect the
properties of the Borrower or such Restricted Subsidiary, (ii) inspect and make
extracts from and copies of their respective books and records, and (iii)
discuss with their respective principal officers their respective businesses,
assets, liabilities, financial positions, results of operations and business
prospects. The Borrower and each of its Restricted Subsidiaries will also permit
representatives of the Administrative Agent and any of the Lenders to discuss
with their respective auditors their respective businesses, assets, liabilities,
financial positions, results of operations and business prospects.

     Section 5.8 Payment of Indebtedness; Loans. Subject to any provisions
regarding subordination herein or as set forth in any other Loan Document, the
Borrower will, and will cause each of its Restricted Subsidiaries to, pay any
and all of their respective Indebtedness when and as it 


                                       61


<PAGE>   63
becomes due, other than amounts diligently disputed in good faith and for which
adequate reserves have been set aside in accordance with GAAP.

     Section 5.9 Use of Proceeds. The Borrower will use the aggregate proceeds
of all Advances (i) to finance Permitted Investments, (ii) to fund Capital
Expenditures, (iii) to (directly or indirectly through Restricted Subsidiaries)
acquire Allowable Wireless Systems as permitted hereunder, and (iv) for working
capital and other general corporate purposes. In addition, on the Agreement Date
with the proceeds of the Initial Advance hereunder, the Borrower shall repay the
Nortel Debt. No proceeds of Advances hereunder shall be used for the purchase or
carrying or the extension of credit for the purpose of purchasing or carrying
any margin stock within the meaning of Regulations G, T, U, and X of the Board
of Governors of the Federal Reserve System.

     Section 5.10 Real Estate. The Borrower will, and will cause its Restricted
Subsidiaries to, grant a mortgage securing the Obligations to the Administrative
Agent, for itself and for the ratable benefit of the Lenders, in form and
substance satisfactory to the Administrative Agent, covering each parcel of real
estate having a fair market value, exclusive of equipment, in excess of $500,000
acquired by the Borrower or any of its Restricted Subsidiaries after the
Agreement Date. The Borrower will, and will cause its Restricted Subsidiaries
to, deliver to the Administrative Agent all documentation, including opinions of
counsel and policies of title insurance, which in the opinion of the
Administrative Agent is appropriate with each such grant, including any Phase I
environmental audit requested by the Administrative Agent or any Lender.

     Section 5.11 Indemnity. The Borrower, for itself and on behalf of each of
its Restricted Subsidiaries agrees, jointly and severally, to indemnify and hold
harmless each Lender and the Administrative Agent and each of their respective
affiliates, employees, representatives, officers, trustees and directors (any of
the foregoing shall be an "Indemnitee") from and against any and all claims,
liabilities, losses, damages, actions, reasonable attorneys' fees and expenses
(as such fees and expenses are incurred) and demands by any party, including the
costs of investigating and defending such claims, whether or not the Borrower,
any Restricted Subsidiary of the Borrower, or the Person seeking indemnification
is the prevailing party (a) resulting from any breach or alleged breach by the
Borrower or any Restricted Subsidiary of the Borrower of any 


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<PAGE>   64
representation, warranty, or covenant made hereunder or under any other Loan
Document; (b) arising out of or in connection with (i) the Revolving Loan
Commitment, the Loans or otherwise under this Agreement or any other Loan
Document (including the taking of Collateral for the Obligations), including the
use of the proceeds of Loans hereunder in any fashion by the Borrower or any of
its Restricted Subsidiaries or the performance of their respective obligations
under the Loan Documents by the Borrower or any of its Restricted Subsidiaries,
(ii) allegations of any participation by the Lenders or the Administrative
Agent, or any of them, in the affairs of the Borrower or any of its Restricted
Subsidiaries, or allegations that any of them has any joint liability with the
Borrower or any of its Restricted Subsidiaries for any reason, or (iii) any
claims against the Lenders or the Administrative Agent, or any of them, by any
shareholder, partner, or other investor in or lender to the Borrower or any
Restricted Subsidiary, by any brokers or finders or investment advisers or
investment bankers retained by the Borrower or by any other third party, arising
out of the Revolving Loan Commitment, the Loans or otherwise under this
Agreement or any other Loan Document; or (c) in connection with taxes (other
than income taxes), fees, and other charges payable in connection with the
Loans, or the execution, delivery, and enforcement of this Agreement, the
Security Documents, the other Loan Documents, and any amendments thereto or
waivers of any of the provisions thereof; unless the Person seeking
indemnification hereunder is determined in such case to have acted with gross
negligence or willful misconduct, in any case by a final, non-appealable
judicial order. The obligations of the Borrower and the Restricted Subsidiaries
under this Section 5.11 are in addition to, and shall not otherwise limit, any
liabilities which the Borrower or any Restricted Subsidiary might otherwise have
in connection with any warranties or similar obligations of the Borrower or such
Restricted Subsidiary in any other agreement or instrument or for any other
reason.

     Section 5.12 Interest Rate Hedging. The Borrower shall, within ninety (90)
days from the Agreement Date and at all times thereafter, maintain one or more
Interest Hedge Agreements which result in the fixing of a limit on the interest
obligations of an aggregate principal amount of not less than fifty percent
(50%) of the then outstanding Total Debt. Such Interest Hedge Agreements shall
provide interest rate protection on terms reasonably acceptable to the
Administrative Agent for an average period of the lesser of three (3) years from
the date of such Interest Hedge Agreement or Agreements or the period remaining
until the 


                                       63


<PAGE>   65
Revolving Loan Maturity Date with respect to Interest Rate Hedge Agreements
entered into in connection with the Revolving Loans and the Tranche A Term Loans
and the Final Maturity Date with respect to Interest Rate Hedge Agreements
entered into in connection with the Term Loans, such terms to include
consideration of the creditworthiness of the other party to the proposed
Interest Hedge Agreement. All Obligations of the Borrower to any of the Lenders
pursuant to any Interest Hedge Agreement shall rank pari passu with all other
Obligations.

     Section 5.13 Covenants Regarding Formation of Restricted Subsidiaries and
the Making of Investments and Acquisitions. At the time of any Acquisition
permitted hereunder by the Borrower or any Restricted Subsidiary, or the
formation of any new Restricted Subsidiary of the Borrower or any of its
Restricted Subsidiaries (except for Restricted Subsidiaries which are then
inactive and which have no assets) which is permitted under this Agreement, the
Borrower will, and will cause its Restricted Subsidiaries, as appropriate, to
(a) in the case of the formation or Acquisition of a new Restricted Subsidiary,
provide to the Administrative Agent an executed Subsidiary Security Agreement
for such new Restricted Subsidiary, in substantially the form of Exhibit I
attached hereto, together with appropriate UCC-1 financing statements, as well
as an executed Subsidiary Guaranty for such new Restricted Subsidiary, in
substantially the form of Exhibit G attached hereto, which shall constitute both
Security Documents and Loan Documents for purposes of this Agreement, as well as
a loan certificate for such new Restricted Subsidiary, substantially in the form
of Exhibit P or Exhibit Q attached hereto, as appropriate, together with
appropriate attachments; (b) in the case of any Acquisition by the Borrower or
any Restricted Subsidiary or the formation of any new Restricted Subsidiary,
pledge to the Administrative Agent all of the stock (or other instruments or
securities evidencing ownership) of such Restricted Subsidiary or Person which
is acquired or formed, beneficially owned by the Borrower or any of the
Borrower's Restricted Subsidiaries, as the case may be, as additional Collateral
for the Obligations to be held by the Administrative Agent in accordance with
the terms of the Borrower's Pledge Agreement, Subsidiary Pledge Agreement, or a
new Subsidiary Pledge Agreement in substantially the form of Exhibit H attached
hereto, and execute and deliver to the Administrative Agent all such
documentation for such pledge as, in the reasonable opinion of the
Administrative Agent, is appropriate; and (c) in any case, provide all other
documentation, including one or more opinions of counsel 


                                       64


<PAGE>   66
satisfactory to the Administrative Agent which in the opinion of the
Administrative Agent is appropriate with respect to such Acquisition or the
formation of such Restricted Subsidiary. Investments made by the Borrower or any
of its Restricted Subsidiaries after the Agreement Date shall also be treated as
additional Collateral and shall be subject to the provisions of appropriate
Security Documents. Any document, agreement or instrument executed or issued
pursuant to this Section 5.13 shall be a "Loan Document" for purposes of this
Agreement.

     Section 5.14 Designation of Unrestricted Subsidiaries as Restricted
Subsidiaries. Upon not less than three (3) Business Days' prior written notice
by the Borrower to the Administrative Agent, any Unrestricted Subsidiary of the
Borrower may be designated as a Restricted Subsidiary hereunder, provided that
(i) no Default then exists or would be caused thereby, (ii) any such Subsidiary
does not (at the time of such designation) have outstanding any Indebtedness for
Money Borrowed other than Permitted Debt, or any Liens on its assets or
properties other than Permitted Liens, and (iii) such Subsidiary shall provide
to the Administrative Agent an executed Subsidiary Security Agreement, in
substantially the form of Exhibit I attached hereto, together with appropriate
UCC-1 financing statements, an executed Subsidiary Guaranty in substantially the
form of Exhibit G attached hereto, and a Subsidiary Pledge Agreement (given by
itself if appropriate and, if its stock or other securities are not then
Collateral, given by its parent company), in substantially the form attached
hereto, as Exhibit H, together with appropriate stock certificates and stock
powers therefor, as well as an appropriate loan certificate for such new
Restricted Subsidiary, substantially in the form of Exhibit P or Exhibit Q,
attached hereto, as appropriate. Such new Restricted Subsidiary shall also
provide all other documentation which in the opinion of the Administrative Agent
is appropriate with respect to the designation of such Unrestricted Subsidiary
as a Restricted Subsidiary, including legal opinions if advisable, all of which
documents shall constitute Security Documents and Loan Documents for purposes of
this Agreement. The Borrower may not designate a Restricted Subsidiary as an
Unrestricted Subsidiary.

     Section 5.15 Payment of Wages. The Borrower and each of its Restricted
Subsidiaries shall at all times comply, in all material respects, with the
requirements of the Fair Labor Standards Act, as amended, including, without
limitation, the provisions of such Act relating to the 


                                       65


<PAGE>   67
payment of minimum and overtime wages as the same may become due from time to
time.

     Section 5.16 Year 2000 Problem. The Borrower agrees to remain substantially
in compliance with the plan dealing with the "Year 2000 Problem" described in
Section 4.1(y), except to the extent that non-compliance therewith would not
have a Materially Adverse Effect.

                                    ARTICLE 6

                              Information Covenants

     So long as any of the Obligations is outstanding and unpaid or the Borrower
has a right to borrow hereunder (whether or not the conditions to borrowing have
been or can be fulfilled), and unless the Majority Lenders, or such greater
number of Lenders as may be expressly provided herein, shall otherwise consent
in writing, the Borrower will furnish or cause to be furnished to each Lender
and the Administrative Agent, at their respective offices:

     Section 6.1 Quarterly Financial Statements and Information. Within sixty
(60) days after the last day of each quarter of each fiscal year of the
Borrower, unaudited balance sheets of the Borrower on a consolidated basis with
its Restricted Subsidiaries, and on a consolidated basis with all of its
Subsidiaries, as at the end of such quarter and as of the end of the preceding
fiscal year, and the related statements of operations and the related statements
of cash flows of the Borrower on a consolidated basis with its Restricted
Subsidiaries, and on a consolidated basis with all of its Subsidiaries, for such
quarter and for the elapsed portion of the year ended with the last day of such
quarter, which shall set forth in comparative form such figures as at the end of
and for such quarter and the appropriate prior period (but only for such quarter
and other periods for which such comparative figures are available) and shall be
certified by the chief financial officer of the Borrower, to be, in his or her
opinion, complete and correct in all material respects and to present fairly, in
accordance with GAAP (except as to the exclusion of Unrestricted Subsidiaries
which should be consolidated with the Borrower under GAAP), the financial
position of the Borrower on a consolidated basis with its Restricted
Subsidiaries and on a consolidated basis with all of its Subsidiaries, as at the
end of such period and the results of operations for such period, and for the
elapsed portion of the year ended with the last day of such period, subject only
to normal year-end adjustments.


                                       66


<PAGE>   68
     Section 6.2 Annual Financial Statements and Information. Within one hundred
twenty (120) days after the end of each fiscal year of the Borrower, the audited
consolidated balance sheet of the Borrower and its Restricted Subsidiaries as of
the end of such fiscal year and the related audited consolidated statements of
operations for such fiscal year and, to the extent available, for the previous
two (2) fiscal years, the related audited consolidated statements of changes in
shareholders' equity for such fiscal year and, to the extent available, for the
previous two (2) fiscal years, and related audited consolidated statements of
cash flows of such fiscal year and, to the extent available, for the previous
two (2) fiscal years, which shall be accompanied by an opinion of Arthur
Anderson & Co., or other independent certified public accountants of recognized
national standing reasonably acceptable to the Administrative Agent, together
with a statement of such accountants that in connection with their audit,
nothing came to their attention that caused them to believe that the Borrower
was not in compliance with the terms, covenants, provisions or conditions of
Article 7 hereof.

     Section 6.3 Performance Certificates. At the time the financial statements
are furnished pursuant to Sections 6.1 and 6.2 hereof, the Performance
Certificate:

     (a) setting forth as at the end of such quarterly period or fiscal year, as
the case may be, the arithmetical calculations required to establish (i) any
interest rate adjustment, as provided for in Section 2.3(f) hereof, and (ii)
whether or not the Borrower was in compliance with the requirements of the
Financial Covenants hereof;

     (b) setting forth on a consolidated basis for the Borrower and its
Restricted Subsidiaries, for each such fiscal quarter or fiscal year, as the
case may be, (i) the number of PCS System subscribers at the beginning of such
period, (ii) the number of gross new PCS System subscribers added and
deactivated PCS System subscribers lost during such period, and (iii) the number
of PCS System subscribers at the end of such period; and

     (c) stating that, to the best of his or her knowledge, no Default or Event
of Default has occurred as at the end of such quarterly period or year, as the
case may be, or, if a Default or an Event of Default has occurred, disclosing
each such Default or Event of Default and its nature, when it occurred, whether
it is continuing and the steps being taken 


                                       67


<PAGE>   69
by the Borrower with respect to such Default or Event of Default.

     Section 6.4 Copies of Other Reports.

     (a) Promptly upon receipt thereof, copies of all material reports, if any,
submitted to the Borrower by the Borrower's independent public accountants
regarding the Borrower, including, without limitation, any management report
prepared in connection with the annual audit referred to in Section 6.2.

     (b) Promptly upon receipt thereof, copies of any material adverse notice or
report regarding any License held by the Borrower or any Restricted Subsidiary
from the FCC.

     (c) In connection with any proposed Acquisition by the Borrower or any
Restricted Subsidiary and promptly upon each request, such data, certificates,
reports, statements, opinions of counsel prepared for the Administrative Agent
and the Lenders, or any of them, documents or further information regarding the
business, assets, liabilities, financial position, projections, results of
operations or business prospects of the Borrower or any of its Restricted
Subsidiaries as the Administrative Agent or any Lender may reasonably request.

     (d) Annually, a certificate of insurance indicating that the requirements
of Section 5.5 hereof remain satisfied for such fiscal year.

     (e) Annually, and in no event later than January 31 of any year, a copy of
the Borrower's annual financial projections for itself and its Restricted
Subsidiaries for such fiscal year.

     (f) Upon request, information reasonably requested by the Administrative
Agent with regard to the "Year 2000 Problem," described in Section 4.1(y)hereof.

     Section 6.5 Notice of Litigation and Other Matters. Notice specifying the
nature and status of any of the following events, promptly, but in any event not
later than ten (10) days after any officer of the Borrower becomes aware of the
occurrence of any of the following events:

     (a) the commencement of all material proceedings and investigations by or
before any governmental body and all actions and proceedings in any court or
before any arbitrator against, or to the extent known to the Borrower, 


                                       68


<PAGE>   70
in any other way relating materially adversely to the Borrower or any Restricted
Subsidiary of the Borrower, or any of their respective properties, assets or
businesses or any License;

     (b) any material adverse change with respect to the business, assets,
liabilities, financial position, results of operations or business prospects of
the Borrower or any Restricted Subsidiary of the Borrower, other than changes in
the ordinary course of business which have not had and could not have a
Materially Adverse Effect;

     (c) any Default or the occurrence or non-occurrence of any event (A) which
constitutes, or which with the passage of time or giving of notice or both would
constitute a material default by the Borrower or any Restricted Subsidiary of
the Borrower under any material agreement other than this Agreement to which the
Borrower or any Restricted Subsidiary of the Borrower is a party or by which any
of their respective properties may be bound, or (B) which could have a
Materially Adverse Effect, giving in each case the details thereof and
specifying the action proposed to be taken with respect thereto;

     (d) the occurrence of any Reportable Event or a "prohibited transaction"
(as such term is defined in Section 406 of ERISA or Section 4975 of the Code)
with respect to any Plan of the Borrower or any of its Subsidiaries or the
institution or threatened institution by PBGC of proceedings under ERISA to
terminate or to partially terminate any such Plan or the commencement or
threatened commencement of any litigation regarding any such Plan or naming it
or the trustee of any such Plan with respect to such Plan; and

     (e) the occurrence of any event subsequent to the Agreement Date which, if
such event had occurred prior to the Agreement Date, would have constituted an
exception to the representation and warranty in Section 4.1(m) of this
Agreement.

                                    ARTICLE 7

                               Negative Covenants

     So long as any of the Obligations is outstanding and unpaid or the Borrower
has a right to borrow from the Lenders hereunder (whether or not the conditions
to borrowing have been or can be fulfilled), and unless the Majority Lenders, or
such greater number of Lenders as may 


                                       69


<PAGE>   71
be expressly provided herein, shall otherwise consent in writing:

     Section 7.1 Indebtedness of the Borrower and its Restricted Subsidiaries.

     The Borrower shall not, and shall cause each of its Restricted Subsidiaries
not to, create, assume, incur or otherwise become or remain obligated in respect
of, or permit to be outstanding, any Indebtedness except:

     (a) The Obligations;

     (b) Current accounts payable, accrued expenses and customer advance
payments incurred in the ordinary course of business;

     (c) Specified Transactions in the aggregate not to exceed the Basket;

     (d) Indebtedness secured by Permitted Liens (other than those described in
items (a) and (i) of the definition of Permitted Liens);

     (e) Obligations under Interest Hedge Agreements;

     (f) Indebtedness of the Borrower or any of its Restricted Subsidiaries to
the Borrower or any other Restricted Subsidiary, and Indebtedness expressly
permitted under Section 7.5 hereof; and

     (g) Indebtedness representing extensions, renewals, refinancings or
replacements (but not increases in principal amounts) of the foregoing.

     Section 7.2 Limitation on Liens. The Borrower shall not, and shall cause
each of its Restricted Subsidiaries not to, create, assume, incur or permit to
exist or to be created, assumed, incurred or permitted to exist, directly or
indirectly, any Lien on any of their respective properties or assets, whether
now owned or hereafter acquired, except for Permitted Liens.

     Section 7.3 Amendment and Waiver. The Borrower shall not, and shall cause
each of its Restricted Subsidiaries not to, except in connection with a
transaction otherwise permitted hereunder, enter into any amendment of, or agree
to or accept or consent to any waiver of any of the material provisions of its
articles or certificate of incorporation or partnership agreement, as
appropriate.


                                       70


<PAGE>   72
     Section 7.4 Liquidation, Merger, Disposition of Assets.

     (a) Disposition of Assets. The Borrower shall not, and shall cause each of
its Restricted Subsidiaries not to, at any time sell, lease, abandon, or
otherwise dispose of any of its or their Core Properties (other than swaps of
PCS Systems permitted under Section 7.6(b)(i) hereof) unless (i) Net Proceeds
therefrom are applied as provided in Section 2.8(b) hereof, and (ii) no Default
then exists or would be caused thereby (unless such sale, lease, abandonment or
other disposal would cure any such Default). At the time of any such Permitted
Asset Sale hereunder, the Borrower shall provide the Administrative Agent and
the Lenders with projections assuming the consummation of the Permitted Asset
Sale and demonstrating pro forma compliance with the Financial Covenants hereof
for the remaining term of this Agreement.

     (b) Liquidation or Merger. The Borrower shall not, and shall cause each of
its Restricted Subsidiaries not to, at any time liquidate or dissolve itself (or
suffer any liquidation or dissolution) or otherwise wind up, or enter into any
merger, provided that if no Default then exists or would be caused thereby, the
following such transactions are permitted: (i) a merger among the Borrower and
one or more Restricted Subsidiaries, provided the Borrower is the surviving
corporation; (ii) a merger between or among two or more Restricted Subsidiaries;
(iii) an Acquisition permitted hereunder effected by a merger in which the
Borrower or a Restricted Subsidiary of the Borrower is the surviving Person; and
(iv) a liquidation or dissolution of one or more Restricted Subsidiaries into
its or their parent entity (provided the Borrower or one of its Restricted
Subsidiaries is such parent entity).

     Section 7.5 Limitation on Guaranties. The Borrower shall not, and shall
cause each of its Restricted Subsidiaries not to, at any time Guaranty, assume,
be obligated with respect to, or permit to be outstanding any Guaranty of, any
obligation of any other Person other than (a) a guaranty by endorsement of
negotiable instruments for collection in the ordinary course of business, or (b)
obligations under agreements of the Borrower or any of its Restricted
Subsidiaries entered into in connection with leases of real property or the
acquisition of services, supplies and equipment in the ordinary course of
business of the Borrower or any of its Restricted Subsidiaries, or (c) as may be
contained in any Loan Document including, without limitation, the Subsidiary
Guaranty, or (d) a Guaranty of 


                                       71


<PAGE>   73
any obligation of any employee of the Borrower or any of its Restricted
Subsidiaries, provided that the aggregate amount guaranteed under all such
Guaranties under this Section 7.5(d) shall not exceed $1,000,000 at any time.

     Section 7.6 Investments and Acquisitions. The Borrower shall not, and shall
cause each of its Restricted Subsidiaries not to, make any loan or advance, or
make any Investment or otherwise acquire for consideration evidences of
Indebtedness, capital stock or other securities of any Person, or make any
Acquisition, except that the Borrower may make Investments in its own Restricted
Subsidiaries, and that, so long as no Default then exists or would be caused
thereby:

     (a) Cash Equivalents. The Borrower and its Restricted Subsidiaries may,
directly or through a brokerage account (i) purchase marketable, direct
obligations of the United States of America, its agencies and instrumentalities
maturing within three hundred sixty-five (365) days of the date of purchase,
(ii) purchase commercial paper issued by corporations, each of which shall have
a combined net worth of at least $100 million and each of which conducts a
substantial part of its business in the United States of America, maturing
within two hundred seventy (270) days from the date of the original issue
thereof, and rated "P-2" or better by Moody's Investors Service, Inc. or "A-2"
or better by Standard and Poor's Ratings Group, (iii) purchase repurchase
agreements, bankers' acceptances, and certificates of deposit maturing within
three hundred sixty-five (365) days of the date of purchase which are issued by,
or time deposits maintained with, a United States national bank the deposits of
which are insured by the Federal Deposit Insurance Corporation and having
capital, surplus and undivided profits totaling more than $100 million and rated
"A" or better by Moody's Investors Service, Inc. or Standard and Poor's Ratings
Group, and (iv) purchase shares of any open-end investment company registered
under the Investment Company Act of 1940, that invests all or substantially all
of its funds in the items described in clauses (i) through (iii), above, which
meets the requirements set forth in Rule 2a-7, Money Market Funds, under that
Act, made available by any Lender or its Affiliate;

     (b) Acquisitions. (i) Subject to compliance with subsection (ii) of this
Section 7.6(b), the Borrower and its Restricted Subsidiaries may make
Acquisitions as follows:


                                       72


<PAGE>   74
          (A) Acquisitions of Allowable Wireless Systems as permitted by Section
     2.8(b)(ii) hereof;

          (B) Acquisitions of Allowable Wireless Systems, and dispositions of
     PCS Systems, in connection with swap transactions involving the trade of
     its PCS Systems for those of other operators of PCS Systems (whether or not
     such swaps involve boot);

          (C)  Other Acquisitions of Allowable Wireless
     Systems; and

          (D) Acquisitions of PCS Systems other than the Allowable Wireless
     Systems subject to the approval of and upon terms and conditions
     satisfactory to the Majority Lenders.

     (ii) No Acquisitions otherwise permitted under Section 7.6(b) hereof may be
consummated unless:

          (A) the Borrower shall have demonstrated through revised projections
     assuming the consummation of the Acquisition its pro forma compliance with
     the Financial Covenants hereof, after giving effect to such Acquisition and
     shall have certified to the Administrative Agent and the Lenders that such
     Acquisition shall not have a Materially Adverse Effect;

          (B) with respect to any Acquisition for total consideration of more
     than $10,000,000, the Borrower shall provide the Administrative Agent and
     the Lenders with notice, not less than thirty (30) days prior to the
     proposed closing thereof, and with copies of all material information
     pertaining to such Acquisition, and a certificate signed by the chief
     financial officer of the Borrower, certifying the Borrower's pro forma
     compliance with the Financial Covenants hereof, together with any
     calculations necessary to demonstrate such compliance; and

          (C) Section 5.13 of this Agreement has been complied with.

     (c) Other Investments.

     (i) The Borrower and its Restricted Subsidiaries may (in addition to any
Investments or Acquisitions otherwise permitted under this Section 7.6) make
Investments in Unrestricted Subsidiaries engaged primarily in the business of
wireless communications.


                                       73


<PAGE>   75
     (ii) No Investment otherwise permitted under this Section 7.6(c) hereof may
be consummated unless:

          (A) the Borrower shall have demonstrated through revised projections
     assuming the consummation of the Investment its pro forma compliance with
     the Financial Covenants hereof, after giving effect to the Advance of the
     Loans used for such Investment, and shall have certified to the
     Administrative Agent and the Lenders that such Investment shall not have a
     Materially Adverse Effect; and

          (B) with respect to any Investment of more than $10,000,000, the
     Borrower shall provide the Administrative Agent and the Lenders with
     notice, not less than ten (10) days prior to the proposed closing of the
     Investment, and with copies of all material information pertaining to such
     Investment, and a certificate signed by the chief financial officer of the
     Borrower certifying the Borrower's pro forma compliance with the Financial
     Covenants hereof, together with any calculations necessary to demonstrate
     such compliance.

     (d) Dollar Limitations on Acquisitions and Investments. The aggregate
amount of Investments and Acquisitions permitted pursuant to Section 7.6(b) and
Section 7.6(c) during the term of this Agreement shall be $225,000,000, plus
Available Equity; provided, however, that prior to the Investment in the
Borrower and its Restricted Subsidiaries of Minimum Additional Contributed
Capital, the aggregate amount of Investments pursuant to Section 7.6(c) hereof
shall be limited to $125,000,000, and Investments shall be limited to
Investments in Unrestricted Subsidiaries for the purpose of making Investments
in Cook Inlet Western Wireless PV/SS PCS, L.P. and in a venture relating to the
Wichita BTA; and provided further, however, that subsequent to the infusion of
Minimum Additional Contributed Capital into the Borrower and its Restricted
Subsidiaries, up to $175,000,000 plus Available Equity of the aggregate
limitation on Investments and Acquisitions may be used for Investments pursuant
to Section 7.6(c) hereof, with $75,000,000 plus Available Equity being
thereafter available for Investments in the business of wireless communications
other than Investments in Unrestricted Subsidiaries for the purpose of making
Investments in Cook Inlet Western Wireless PV/SS PCS, L.P. and in a venture
relating to the Wichita BTA. Available Equity may be allocated at the Borrower's
discretion to increase the available basket for Acquisitions and Investments,
but may not be double-counted.


                                       74


<PAGE>   76
     (e) Employee Loans. The Borrower and its Restricted Subsidiaries may make
loans to employees, (i) in connection with stock option plans, provided (x) such
loans do not involve cash payments by the Borrower and (y) the Borrower and its
Restricted Subsidiaries incur no obligations at any time to repurchase the stock
so purchased, and (ii) for all other purposes in an amount not to exceed, in the
aggregate outstanding at any time, $1,000,000.

     Section 7.7 Restricted Payments and Purchases. The Borrower shall not, and
shall cause each of its Restricted Subsidiaries not to, directly or indirectly
declare or make any Restricted Payment or Restricted Purchase, except that so
long as no Default hereunder then exists or would be caused thereby: (a) the
Borrower may make Restricted Payments to VoiceStream, to permit VoiceStream to
make scheduled payments of interest on Subordinated Debt, to the extent the Net
Proceeds of such Subordinated Debt were Invested in the Borrower and its
Restricted Subsidiaries, (b) on June 30, 2000 and on each June 30th thereafter,
the Borrower may pay dividends or make other distributions to VoiceStream, to
service Subordinated Debt or for any other purpose, provided that (i) the
Borrower shall have prepaid the Loans from the Borrower's Excess Cash Flow for
the preceding fiscal year in the amount required by Section 2.8(a) hereof, (ii)
the aggregate amount of such dividends and distributions shall not exceed, in
any year, the amount of the Borrower's Excess Cash Flow for the preceding fiscal
year remaining after payment of the amount required to be prepaid on the Loans
by the Borrower pursuant to Section 2.8(a) hereof, and (iii) the Borrower shall
provide the Lenders with a certificate, signed by the chief financial officer of
the Borrower, demonstrating pro forma compliance with the terms of this Section
7.7, after giving effect to such dividend payments; and (c) the Borrower may
make payments required to be made under the VoiceStream Agreements.

     Section 7.8 Stage One -- Ratio of Senior Debt to Contributed Capital. The
Borrower shall not as of the end of any fiscal quarter prior to April 1, 2002,
permit the ratio of its (i) Senior Debt to (ii) the sum (without
double-counting) of Contributed Capital plus Additional Contributed Capital, to
exceed the ratios set forth below for such fiscal quarter ends:


<TABLE>
<CAPTION>
     Quarter Ended:                               Ratio
                                                  -----
<S>                                               <C>
Agreement Date through December 31, 1999            40%
January 1, 2000 through March 31, 2002              45%
</TABLE>


                                       75


<PAGE>   77
     Section 7.9 Stage One -- Ratio of Total Debt to Contributed Capital. The
Borrower shall not permit the ratio as of the end of any fiscal quarter of its
(i) Total Debt to (ii) the sum (without double-counting) of its Contributed
Capital plus its Additional Contributed Capital, to exceed sixty percent (60%)
as of the end of any fiscal quarter prior to April 1, 2002.

     Section 7.10 Stage One -- Minimum Annualized Revenues. The Borrower shall
not permit its Annualized Revenues as of the end of any fiscal quarter shown
below to be less than the Minimum Annualized Revenues shown for such period:


<TABLE>
<CAPTION>
          Period Ending       Minimum Annualized Revenues
          -------------       ---------------------------
<S>                           <C>         
              6/30/98                 $ 75,000,000
              9/30/98                 $ 92,000,000
             12/31/98                 $110,000,000
              3/31/99                 $130,000,000
              6/30/99                 $150,000,000
              9/30/99                 $175,000,000
             12/31/99                 $200,000,000
              3/31/00                 $220,000,000
              6/30/00                 $245,000,000
              9/30/00                 $270,000,000
             12/31/00                 $295,000,000
              3/31/01                 $320,000,000
              6/30/01                 $340,000,000
              9/30/01                 $365,000,000
             12/31/01                 $390,000,000
              3/31/02                 $410,000,000
</TABLE>


     Section 7.11 Stage One -- Maximum Capital Expenditures. The Borrower shall
not permit in any fiscal year its Capital Expenditures to exceed the Maximum
Capital Expenditures for such fiscal year shown below:


<TABLE>
<CAPTION>
          Period Ending       Maximum Capital Expenditures
          -------------       ----------------------------
<S>                           <C>         
             12/31/98                 $295,000,000
             12/31/99                 $100,000,000
             12/31/00                 $ 85,000,000
             12/31/01                 $ 85,000,000
</TABLE>


The Capital Expenditures limitation in any year may be increased by an amount,
if any, equal to the Capital Expenditures limit for the previous year, less the
actual Capital Expenditures for such year.

     Section 7.12 Stage Two -- Ratio of Operating Cash Flow to Cash Interest
Expense. The Borrower shall not 


                                       76


<PAGE>   78
permit the ratio, as of the end of any fiscal quarter ending after September 30,
2001, of its Operating Cash Flow for the two (2) fiscal quarter periods then
ended, to its Cash Interest Expense for such two (2) fiscal quarter periods, to
be less than 1.25:1.

     Section 7.13 Stage Two -- Fixed Charge Coverage Ratio. The Borrower shall
not permit the Fixed Charge Coverage Ratio for any fiscal quarter ending after
September 30, 2001 to be less than 1.00:1.

     Section 7.14 Stage Two -- Leverage Ratios. The Borrower shall not permit
the Leverage Ratio (Senior Debt) to exceed the ratio set forth below in column A
for any fiscal quarter ending after September 30, 2001 during the periods
indicated; nor shall the Borrower permit the Leverage Ratio (Total Debt) to
exceed the ratio set forth in column B for any fiscal quarter ending during the
periods indicated:


<TABLE>
<CAPTION>
                                     A               B
                                   Senior          Total
        Period                    Debt Ratio      Debt Ratio
        ------                    ----------      ----------
<S>                               <C>             <C>
December 31, 2001                  10.00:1          13.00:1

March 31, 2002                      9.00:1          11.50:1

June 30, 2002                       8.00:1          10.50:1

September 30, 2002                  7.00:1           9.00:1

December 31, 2002                   6.50:1           8.50:1

March 31, 2003                      6.00:1           8.00:1

June 30, 2003                       5.50:1           7.50:1

September 30, 2003                  5.00:1           7.00:1

December 31, 2003 and
    Thereafter                      4.00:1           6.00:1
</TABLE>


     Section 7.15 Stage Two -- Annualized Operating Cash Flow to Pro Forma Debt
Service Ratio. The Borrower shall not permit the ratio of its Annualized
Operating Cash Flow to its Pro Forma Debt Service to be less than 1.00:1 for any
fiscal quarter ending after September 30, 2001.


                                       77


<PAGE>   79
     Section 7.16 Affiliate Transactions. Except as specifically provided herein
(including, without limitation, Section 7.6 (with respect to Investments in
Unrestricted Subsidiaries) and Section 7.7 hereof) and as may be described on
Schedule 8 attached hereto, the Borrower shall not, and shall cause each of its
Restricted Subsidiaries not to, at any time engage in any material transaction
with an Affiliate, or make an assignment or other transfer of any of its
properties or assets to any Affiliate, unless such transaction (i) is determined
by the board of directors of the Borrower or such Restricted Subsidiary to be in
the best interests of the Borrower or such Restricted Subsidiary, and (ii) such
transaction is on terms no less advantageous to the Borrower or such Restricted
Subsidiary than would be the case if such transaction had been effected with a
non-Affiliate.

     Section 7.17 Real Estate. Neither the Borrower nor any of its Restricted
Subsidiaries shall purchase or become obligated to purchase any single parcel of
real estate having a purchase price in excess of $500,000 except in compliance
with Section 5.10 hereof.

     Section 7.18 ERISA Liabilities. The Borrower shall not, and shall cause
each of its Subsidiaries not to, (i) permit the assets of any of their
respective Plans to be less than the amount necessary to provide all accrued
benefits under such Plans on an ongoing basis, or (ii) enter into any
Multiemployer Plan.

     Section 7.19 New Unrestricted Subsidiaries. The Borrower shall not form any
direct Unrestricted Subsidiary of itself or any other Restricted Subsidiary
unless it shall cause all of the stock of such new Unrestricted Subsidiary to be
pledged to the Administrative Agent pursuant to the terms of the Borrower Pledge
Agreement or the Subsidiary Pledge Agreement, as additional Collateral for the
Obligations.

     Section 7.20 Limitation on Preferred Stock of Restricted Subsidiaries. The
Borrower shall not permit any Restricted Subsidiary to create or issue any
preferred stock except for (a) preferred stock issued to and held by the
Borrower or any other Restricted Subsidiary, (b) preferred stock issued by a
Person prior to the time such Person became a direct or indirect Restricted
Subsidiary or (c) preferred stock issued by a Restricted Subsidiary, the
proceeds of which are used to refinance any outstanding preferred stock of such
Restricted Subsidiary, with an aggregate liquidation preference not to exceed
the 


                                       78


<PAGE>   80
liquidation preference of the preferred stock so refinanced, plus the amount of
any financing fees and other expenses incurred in connection with such
refinancing, and provided such refinancing preferred stock by its terms, or by
the terms of the agreement or instrument pursuant to which such a preferred
stock is issued, does not provide for payments of liquidation values at its
stated maturity or by way of a sinking fund or by way of any mandatory
redemption, defeasance, retirement or repurchase, prior to the stated maturity
of the preferred stock being refinanced.

     Section 7.21 Limitation on Leases. Neither the Borrower nor any of its
Restricted Subsidiaries shall make or be or become obligated to make any payment
in respect of any obligation as lessee under any lease for property or equipment
having an unexpired term (including any renewal terms under options available to
the lessor) of more than five years (excluding any lease permitting cancellation
at the option of the lessee within sixty (60) days or less) unless, after giving
effect to the incurrence of such lease liability, the aggregate rental
obligations for periods commencing five years after the end of the most
recently- completed fiscal quarter for all such leases in any fiscal year does
not exceed the greater of $25,000,000, or ten percent (10%) of the total
revenues of the Borrower and its Restricted Subsidiaries for the prior fiscal
year.

                                    ARTICLE 8

                                     Default

     Section 8.1 Events of Default. Each of the following shall constitute an
Event of Default, whatever the reason for such event and whether it shall be
voluntary or involuntary or be effected by operation of law or pursuant to any
judgment or order of any court or any order, rule or regulation of any
governmental or non-governmental body:

     (a) Any representation or warranty made under this Agreement or any other
Loan Document shall prove to be incorrect or misleading in any material respect
when made or deemed to be made pursuant to Section 4.2 hereof;

     (b) (i) The Borrower shall default in the payment of any principal amount
of the Notes, or (ii) the Borrower shall default in the payment of any interest,
fees or other amounts payable to the Lenders, the Administrative Agent, or any
of them, when due, and such Default shall not be cured by payment in full within
three (3) Business Days;


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<PAGE>   81
     (c) The Borrower shall default in the performance or observance of any
agreement or covenant contained in Article 7 hereof;

     (d) The Borrower shall default in the performance or observance of any
other agreement or covenant contained in this Agreement not specifically
referred to elsewhere in this Section 8.1, and such default shall not be cured
within a period of thirty (30) days from the date of occurrence of such default,
or, if later, the date on which an officer of the Borrower knew or should have
known of the occurrence of such default;

     (e) There shall occur any default in the performance or observance of any
agreement or covenant or breach of any representation or warranty contained in
any of the Loan Documents (other than this Agreement or as otherwise provided in
this Section 8.1) by the Borrower, any of its Subsidiaries, VoiceStream or any
other obligor thereunder, which shall not be cured within a period of thirty
(30) days from the occurrence of such default, or, if later, the date on which
an officer of the Borrower knew or should have known of the occurrence of such
default;

     (f) There shall be entered and remain unstayed a decree or order for relief
in respect of the Borrower or any of its Subsidiaries (other than any
Unrestricted Subsidiary which has no material assets or liabilities) under Title
11 of the United States Code as now constituted or hereafter amended, or any
other applicable Federal or state bankruptcy law or other similar law, or
appointing a receiver, liquidator, assignee, trustee, custodian, sequestrator or
similar official of the Borrower or any of its Subsidiaries (other than any
Unrestricted Subsidiary which has no material assets or liabilities), or of any
substantial part of their respective properties, or ordering the winding-up or
liquidation of the affairs of the Borrower or any of its Subsidiaries (other
than any Unrestricted Subsidiary which has no material assets or liabilities);
or an involuntary petition shall be filed against the Borrower or any of its
Subsidiaries (other than any Unrestricted Subsidiary which has no material
assets or liabilities) and a temporary stay entered, and (i) such petition and
stay shall not be diligently contested, or (ii) such petition and stay shall
continue undismissed for a period of forty-five (45) consecutive days;

     (g) The Borrower or any of its Subsidiaries (other than any Unrestricted
Subsidiary which is inactive) shall file a petition, answer or consent seeking
relief under 


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<PAGE>   82
Title 11 of the United States Code, as now constituted or hereafter amended, or
any other applicable Federal or state bankruptcy law or other similar law, or
the Borrower or any of its Subsidiaries (other than any Unrestricted Subsidiary
which has no material assets or liabilities) shall consent to the institution of
proceedings thereunder or to the filing of any such petition or shall seek or
consent to the appointment or taking of possession of a receiver, liquidator,
assignee, trustee, custodian, sequestrator or other similar official of the
Borrower or any of its Subsidiaries (other than any Unrestricted Subsidiary
which has no material assets or liabilities), or of any substantial part of
their respective properties, or the Borrower or any its Subsidiaries (other than
any Unrestricted Subsidiary which has no material assets or liabilities) shall
fail generally to pay their respective debts as they become due, or the Borrower
or any of its Subsidiaries (other than any Unrestricted Subsidiary which has no
material assets or liabilities) shall take any action in furtherance of any such
action;

     (h) A judgment shall be entered by any court against the Borrower or any of
its Subsidiaries for the payment of money which exceeds singly or in the
aggregate with other such judgments, $1,000,000, or a warrant of attachment or
execution or similar process shall be issued or levied against property of the
Borrower or any of its Subsidiaries which, together with all other such property
of the Borrower or any of its Subsidiaries subject to other such process,
exceeds in value $1,000,000 in the aggregate, and if, within thirty (30) days
after the entry, issue or levy thereof, such judgment, warrant or process shall
not have been paid or discharged or stayed pending appeal, or if, after the
expiration of any such stay, such judgment, warrant or process shall not have
been paid or discharged;

     (i) There shall be at any time any "accumulated funding deficiency," as
defined in ERISA or in Section 412 of the Code, with respect to any Plan
maintained by the Borrower or any of its Subsidiaries, or to which the Borrower
or any of its Subsidiaries has any liabilities, or any trust created thereunder;
or a trustee shall be appointed by a United States District Court to administer
any such Plan; or PBGC shall institute proceedings to terminate any such Plan;
or the Borrower or any of its Subsidiaries shall incur any liability to PBGC in
connection with the termination of any such Plan; or any Plan or trust created
under any Plan of the Borrower or any of its Subsidiaries shall engage in a
"prohibited transaction" (as such term is defined in Section 406 of ERISA or
Section 4975 


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<PAGE>   83
of the Code) which would subject any such Plan, any trust created thereunder,
any trustee or administrator thereof, or any party dealing with any such Plan or
trust to the tax or penalty in any material amount on "prohibited transactions"
imposed by Section 502 of ERISA or Section 4975 of the Code and, in each case,
such event or condition, together with other such events or conditions, if any,
would subject the Borrower and its Subsidiaries to any tax, liability or penalty
in excess of $1,000,000;

     (j) Any event shall occur which has a Materially Adverse Effect;

     (k) There shall occur (i) any default under any Indebtedness of
VoiceStream, the Borrower or any of its Restricted Subsidiaries in an aggregate
principal amount exceeding $1,000,000 at maturity or which default allows the
holder of such Indebtedness to accelerate the maturity of such Indebtedness; or
(ii) any default under any Interest Hedge Agreement having a notional principal
amount of $1,000,000 or more; or (iii) an "Event of Default" shall occur,
resulting in the acceleration of obligations prior to their stated maturity,
under the Parent's Loan Agreement dated as of February 17, 1998, as amended, at
a time when the Parent owns, directly or indirectly, fifty-one percent (51%) or
more of VoiceStream's common equity;

     (l) The FCC shall deliver to the Borrower or any of its Subsidiaries an
order to show cause why an order of revocation should not be issued based upon
any alleged attribution of alien ownership (within the meaning of 47 U.S.C.
Section 310(b) and any interpretation of the FCC thereunder) to the Borrower or
any of its Subsidiaries and such order shall not have been rescinded within
sixty (60) days after such delivery, with respect to any material License;

     (m) One or more Licenses shall be terminated or revoked such that the
Borrower and its Restricted Subsidiaries are no longer able to operate the
related PCS System or any portion thereof and retain the revenue received
therefrom or any such License shall fail to be renewed at the stated expiration
thereof such that the Borrower and its Restricted Subsidiaries are no longer
able to operate the related PCS System or any portion thereof and retain the
revenue received therefrom, except in the event that the termination or
revocation is with respect to any License that is not material;


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<PAGE>   84
     (n) Any Security Document or any Note or any other Loan Document or any
material provision thereof shall at any time and for any reason be declared by a
court of competent jurisdiction to be null and void, or a proceeding shall be
commenced by VoiceStream or by the Borrower or any of its Subsidiaries, or by
any governmental authority having jurisdiction over VoiceStream or the Borrower
or any of its Subsidiaries, seeking to establish the invalidity or
unenforceability thereof (exclusive of questions of interpretation of any
provision thereof), or VoiceStream or the Borrower or any of its Subsidiaries
shall deny that it has any liability or obligation for the payment of principal
or interest or other obligations purported to be created under any Loan
Document;

     (o) Any Security Document shall for any reason fail or cease to create a
valid and first-priority Lien on or Security Interest in any material portion of
the Collateral purported to be covered thereby, subject to any Permitted Lien,
or any such Lien or Security Interest shall cease to be perfected, except if
such failure results from the Administrative Agent's failure to file any UCC-3
continuation statement in the appropriate jurisdiction; or

     (p) (i) John Stanton ceases, for any reason, to serve as Chairman of
VoiceStream and a successor Chairman acceptable to the Majority Lenders is not
appointed or does not commence to serve within sixty (60) days from the date Mr.
Stanton ceases to serve as Chairman, or (ii) there shall be a Change of Control,
together with the affirmative vote of the Majority Lenders that such Change in
Control, together with any results thereof, constitutes an Event of Default.

     Section 8.2 Remedies.

     (a) If an Event of Default specified in Section 8.1 (other than an Event of
Default under Section 8.1(f) or Section 8.1(g)) shall have occurred and shall be
continuing, the Administrative Agent, at the request of the Majority Lenders,
shall formally declare that an Event of Default has occurred and (i) terminate
the Revolving Loan Commitment and (ii) declare the principal of and interest on
the Loans and the Notes and all other amounts owed to the Lenders and the
Administrative Agent under this Agreement and the Notes and any other
Obligations to be forthwith due and payable without presentment, demand, protest
or notice of any kind, all of which are hereby expressly waived, anything in
this Agreement or in the Notes or any other Loan Document to the contrary
notwithstanding, and the Revolving Loan Commitment 


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<PAGE>   85
and the Tranche A Term Loan Commitment shall thereupon forthwith terminate and
all such amounts shall be immediately due and payable.

     (b) Upon the occurrence and continuance of an Event of Default specified in
Section 8.1(f) or Section 8.1(g), all principal, interest and other amounts due
hereunder and under the Notes, and all other Obligations, shall thereupon and
concurrently therewith become due and payable and the Revolving Loan Commitment
and the Tranche A Term Loan Commitment shall forthwith terminate and the
principal amount of the Loans outstanding hereunder shall bear interest at the
Default Rate, all without any action by the Administrative Agent, the Lenders or
the Majority Lenders or any of them and without presentment, demand, protest or
other notice of any kind, all of which are expressly waived, anything in this
Agreement or in the other Loan Documents to the contrary notwithstanding.

     (c) Upon acceleration of the Notes, as provided in subsection (a) or (b) of
this Section 8.2, the Administrative Agent and the Lenders shall have all of the
post-default rights granted to them, or any of them, under the Loan Documents
and under Applicable Law.

     (d) Upon acceleration of the Notes, as provided in subsection (a) or (b) of
this Section 8.2, the Administrative Agent, upon request of the Majority
Lenders, shall have the right to the appointment of a receiver for the
properties and assets of the Borrower and its Restricted Subsidiaries, both to
operate and to sell such properties and assets, and the Borrower, for itself and
on behalf of its Restricted Subsidiaries, hereby consents to such right and such
appointment and hereby waives any objection the Borrower or any Restricted
Subsidiary may have thereto or the right to have a bond or other security posted
by the Administrative Agent on behalf of the Lenders, in connection therewith.
The rights of the Administrative Agent under this Section 8.2(d) shall be
subject to its prior compliance with the Communications Act and the FCC rules
and policies promulgated thereunder to the extent applicable to the exercise of
such rights.

     (e) The rights and remedies of the Administrative Agent and the Lenders
hereunder shall be cumulative and not exclusive.

     Section 8.3 Payments Subsequent to Declaration of Event of Default.
Subsequent to the acceleration of the Loans under Section 8.2 hereof, payments
and prepayments 


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<PAGE>   86
under this Agreement made to any of the Administrative Agent, the Lenders or
otherwise received by any of such Persons (from realization on Collateral for
the Obligations or otherwise) shall be paid over to the Administrative Agent (if
necessary) and distributed by the Administrative Agent as follows: first, to the
reasonable costs and expenses, if any, incurred in connection with the
collection of such payment or prepayment including, without limitation, any
reasonable costs incurred by any of them in connection with the sale or
disposition of any Collateral for the Obligations; second, to the Lenders and
the Administrative Agent for any fees hereunder or under any of the other Loan
Documents then due and payable; third, to the Lenders pro rata on the basis of
their respective unpaid principal amounts (except as provided in Section
2.2(f)), to the payment of any unpaid interest which may have accrued on the
Obligations; fourth, to the Lenders pro rata until all Advances have been paid
in full (and, for purposes of this clause, obligations under Interest Hedge
Agreements with the Lenders or any of them shall be deemed to be Advances and
shall be paid on a pro rata basis with the Advances); fifth, to the Lenders pro
rata on the basis of their respective unpaid amounts, to the payment of any
other unpaid Obligations; sixth, to damages incurred by the Administrative Agent
or any Lender by reason of any breach hereof or of any other Loan Document; and
seventh, upon satisfaction in full of all Obligations, to the Borrower or as
otherwise required by law. Notwithstanding the foregoing, each Lender may
allocate amounts received by it pursuant to this Section 8.3 in its discretion
to the various Obligations held by it.

                                    ARTICLE 9

                            The Administrative Agent

     Section 9.1 Appointment and Authorization. Each Lender hereby irrevocably
appoints and authorizes, and hereby agrees that it will require any transferee
of any of its interest in its Loan and in its Note irrevocably to appoint and
authorize, the Administrative Agent to take such actions as its agent on its
behalf and to exercise such powers hereunder and under the Security Documents as
are delegated by the terms hereof and thereof, together with such powers as are
reasonably incidental thereto. Neither the Administrative Agent nor any of its
respective directors, officers, employees or agents shall be liable for any
action taken or omitted to be taken by it or them hereunder or in connection
herewith, except for its or their own gross negligence or willful misconduct.


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<PAGE>   87
     Section 9.2 Interest Holders. The Administrative Agent may treat each
Lender, or the Person designated in the last notice filed with the
Administrative Agent, whether under Section 11.1, Section 11.5, or otherwise
hereunder, as the holder of all of the interests of such Lender in its Loan and
in its Note or Notes until written notice of transfer, signed by such Lender (or
the Person designated in the last notice filed with the Administrative Agent)
and by the Person designated in such written notice of transfer, in form and
substance satisfactory to the Administrative Agent, shall have been filed with
the Administrative Agent.

     Section 9.3 Consultation with Counsel. The Administrative Agent may consult
with Paul, Hastings, Janofsky & Walker LLP, Atlanta, Georgia, special counsel to
the Administrative Agent, or with other legal counsel selected by it with due
care and shall not be liable for any action taken or suffered by it in good
faith in consultation with such counsel or at the direction of the Majority
Lenders and in reasonable reliance on such consultations or direction.

     Section 9.4 Documents. The Administrative Agent shall be under no duty to
examine, inquire into, or pass upon the validity, effectiveness or genuineness
of this Agreement, any Note, any other Loan Document, or any other instrument,
document or communication furnished pursuant hereto or in connection herewith,
and the Administrative Agent shall be entitled to assume (absent knowledge to
the contrary) that they are valid, effective and genuine, have been signed or
sent by the proper parties and are what they purport to be.

     Section 9.5 Administrative Agent and Affiliates. With respect to the
Revolving Loan Commitment and its Loans, Toronto Dominion (Texas), Inc. shall
have the same rights and powers hereunder and under the other Loan Documents as
any other Lender and Affiliates of the Administrative Agent may accept deposits
from, lend money to and generally engage in any kind of business with the
Borrower, any of its Subsidiaries or any Affiliates of, or Persons doing
business with, the Borrower, as if they were not affiliated with the
Administrative Agent and without any obligation to account therefor.

     Section 9.6 Responsibility of the Administrative Agent. The duties and
obligations of the Administrative Agent under this Agreement and the Security
Documents are only those expressly set forth in this Agreement and the Security
Documents. The Administrative Agent shall be 


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entitled to assume that no Default has occurred and is continuing unless it has
actual knowledge, or has been notified by the Borrower, of such fact, or has
been notified by a Lender in writing that such Lender considers that a Default
has occurred and is continuing, and such Lender shall specify in detail the
nature thereof in writing. The Administrative Agent shall not be liable
hereunder for any action taken or omitted to be taken except for its own gross
negligence or willful misconduct. The Administrative Agent shall provide
promptly each Lender with copies of such documents received from the Borrower as
such Lender may reasonably request.

     Section 9.7 Security Documents. The Administrative Agent, as collateral
agent hereunder and under the Security Documents, is hereby authorized to act on
behalf of the Lenders, in its own capacity and through other agents and
sub-agents appointed by it with due care, under the Security Documents, provided
that the Administrative Agent shall not agree to the release of any Collateral,
or any property encumbered by any mortgage, pledge or security interests except
in compliance with Section 11.12 hereof. In connection with its role as secured
party with respect to the Collateral hereunder, the Administrative Agent shall
act as collateral agent, for itself and for the ratable benefit of the Lenders,
and such role as administrative agent shall be disclosed on all appropriate
accounts, certificates, filings, mortgages, and other Collateral documentation.

     Section 9.8 Action by the Administrative Agent.

     (a) The Administrative Agent shall be entitled to use its discretion with
respect to exercising or refraining from exercising any rights which may be
vested in it by, and with respect to taking or refraining from taking any action
or actions which it may be able to take under or in respect of, this Agreement,
unless the Administrative Agent shall have been instructed by the Majority
Lenders to exercise or refrain from exercising such rights or to take or refrain
from taking such action; provided that the Administrative Agent shall not
exercise any rights under Section 8.2(a) of this Agreement except upon the
request of the Majority Lenders or of all the Lenders, where expressly required
by this Agreement. The Administrative Agent shall incur no liability under or in
respect of this Agreement with respect to anything which it may do or refrain
from doing in the reasonable exercise of its judgment or which may seem to it to
be necessary or desirable in the circumstances for the protection of the
interests of the Lenders, except for its gross negligence or willful misconduct,
or conduct in breach 


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of this Agreement as determined by a final, non-appealable order of a court
having jurisdiction over the subject matter.

     (b) The Administrative Agent shall not be liable to the Lenders or to any
Lender in acting or refraining from acting under this Agreement or any other
Loan Document in accordance with the instructions of the Majority Lenders or of
all the Lenders, where expressly required by this Agreement, and any action
taken or failure to act pursuant to such instructions shall be binding on all
Lenders.

     Section 9.9 Notice of Default or Event of Default. In the event that the
Administrative Agent or any Lender shall acquire actual knowledge, or shall have
been notified, of any Default (other than through a notice by one party hereto
to all other parties), the Administrative Agent or such Lender shall promptly
notify the Administrative Agent, and the Administrative Agent shall take such
action and assert such rights under this Agreement and the other Loan Documents
as the Majority Lenders or of all the Lenders, where expressly required by this
Agreement, shall request in writing, and the Administrative Agent shall not be
subject to any liability by reason of its acting pursuant to any such request.
If the Majority Lenders shall fail to request the Administrative Agent to take
action or to assert rights under this Agreement in respect of any Default within
ten (10) days after their receipt of the notice of any Default from the
Administrative Agent or any Lender, or shall request inconsistent action with
respect to such Default, the Administrative Agent may, but shall not be required
to, take such action and assert such rights (other than rights under Article 8
hereof) as it deems in its discretion to be advisable for the protection of the
Lenders, except that, if the Majority Lenders have instructed the Administrative
Agent not to take such action or assert such right, in no event shall the
Administrative Agent act contrary to such instructions.

     Section 9.10 Responsibility Disclaimed. The Administrative Agent shall not
be under any liability or responsibility whatsoever as Administrative Agent:

     (a) To the Borrower or any other Person as a consequence of any failure or
delay in performance by or any breach by, any Lender or Lenders of any of its or
their obligations under this Agreement;

     (b) To any Lender or Lenders, as a consequence of any failure or delay in
performance by, or any breach by, (i) 


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the Borrower of any of its obligations under this Agreement or the Notes or any
other Loan Document, or (ii) any Subsidiary of the Borrower or any other obligor
under any other Loan Document; or

     (c) To any Lender or Lenders, for any statements, representations or
warranties in this Agreement, or any other document contemplated by this
Agreement or any other Loan Document, or any information provided pursuant to
this Agreement, any other Loan Document, or any other document contemplated by
this Agreement, or for the validity, effectiveness, enforceability or
sufficiency of this Agreement, the Notes, any other Loan Document, or any other
document contemplated by this Agreement.

     Section 9.11 Indemnification. The Lenders agree to indemnify the
Administrative Agent (to the extent not reimbursed by the Borrower) pro rata
according to their percentage of the outstanding principal amount of the Loans
and their Commitments from and against any and all liabilities, obligations,
losses (other than in the event of a bankruptcy or out-of-court 'work-out' of
the Loans), damages, penalties, actions, judgments, suits, costs, expenses
(including reasonable fees and expenses of experts, agents, consultants and
counsel), or disbursements of any kind or nature whatsoever which may be imposed
on, incurred by or asserted against the Administrative Agent in any way relating
to or arising out of its role as Administrative Agent under this Agreement, any
other Loan Document, or any other document contemplated by this Agreement or any
action taken or omitted by the Administrative Agent under this Agreement, any
other Loan Document, or any other document contemplated by this Agreement in its
role as Administrative Agent, except that no Lender shall be liable to the
Administrative Agent for any portion of such liabilities, obligations, losses,
damages, penalties, actions, judgments, suits, costs, expenses, or disbursements
resulting from the gross negligence or willful misconduct of the Administrative
Agent as determined by a final, non-appealable order of a court having
jurisdiction over the subject matter.

     Section 9.12 Credit Decision. Each Lender represents and warrants to each
other Lender, to each Managing Agent, and to the Administrative Agent that:

     (a) In making its decision to enter into this Agreement and to make its
Advances it has independently taken whatever steps it considers necessary to
evaluate the financial condition and affairs of the Borrower and its
Subsidiaries and that it has made an independent credit 


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judgment, and that it has not relied upon the Administrative Agent, any Managing
Agent, or any other Lender, or information provided by the Administrative Agent
(other than information provided to the Administrative Agent by the Borrower and
forwarded by the Administrative Agent to the Lenders); and

     (b) So long as any portion of the Obligations remains outstanding, it will
continue to make its own independent evaluation of the financial condition and
affairs of the Borrower.

     Section 9.13 Successor Administrative Agent.

     (a) Resignation. Subject to the appointment and acceptance of a successor
Administrative Agent as provided below, the Administrative Agent may resign at
any time by giving written notice thereof to the Lenders and the Borrower. Upon
any such resignation, the Majority Lenders shall have the right to appoint a
successor Administrative Agent. If no successor Administrative Agent shall have
been so appointed by the Majority Lenders and shall have accepted such
appointment within thirty (30) days after the retiring Administrative Agent
gives notice of resignation, then the retiring Administrative Agent may, on
behalf of the Lenders, appoint a successor Administrative Agent which shall be
any Lender or a commercial bank organized under the laws of the United States of
America or any political subdivision thereof which has combined capital and
reserves in excess of $250,000,000. Upon the acceptance of any appointment as
Administrative Agent hereunder by a successor Administrative Agent such
successor Administrative Agent shall thereupon succeed to and become vested with
all the rights, powers, privileges, duties and obligations of the retiring
Administrative Agent and the retiring Administrative Agent shall be discharged
from its duties and obligations hereunder. After any retiring Administrative
Agent's resignation hereunder as Administrative Agent, the provisions of this
Article shall continue in effect for its benefit in respect of any actions taken
or omitted to be taken by it while it was acting as the Administrative Agent.
The resignation of the Administrative Agent may not take effect until a
successor Administrative Agent is appointed.

     (b) Removal. The Administrative Agent may be removed as Administrative
Agent hereunder at any time by written notice given to it by Lenders holding not
less than sixty-six and two-thirds percent (66-2/3%) of the sum of the Revolving
Loan Commitment plus outstanding principal balance of the Term Loans. Upon any
such removal, such Lenders 


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shall have the right to appoint a successor Administrative Agent, subject, at
any such time as there is no Default hereunder, to the prior written consent of
the Borrower, such consent not to be unreasonably withheld or delayed. Any such
successor Administrative Agent may be any Lender or a commercial bank organized
under the laws of the United States of America or any political subdivision
thereof which has combined capital and reserves in excess of $250,000,000. Upon
the acceptance of any appointment as Administrative Agent hereunder by a
successor Administrative Agent, such successor Administrative Agent shall
thereupon succeed to and become vested with all the rights, powers, privileges,
duties and obligations of the retiring Administrative Agent and the retiring
Administrative Agent shall be discharged from its duties and obligations
hereunder. After any retiring Administrative Agent's resignation hereunder as
Administrative Agent, the provisions of this Article shall continue in effect
for its benefit in respect of any actions taken or to be taken by it while it
was acting as the Administrative Agent.

     Section 9.14 Delegation of Duties. The Administrative Agent may execute any
of its respective duties under the Loan Documents by or through agents or
attorneys selected by it using reasonable care, and shall be entitled to advice
of counsel concerning all matters pertaining to such duties.

     Section 9.15 Co-Agents; Managing Agents. None of the Lenders identified on
the facing page of, signature pages of or elsewhere in this Agreement as a
"co-agent" or "managing agent" shall have any right, power, obligation,
liability, responsibility or duty under this Agreement or any other Loan
Document other than those applicable to all Lenders as such. Without limiting
the foregoing, none of the Lenders so identified shall have or be deemed to have
any fiduciary relationship with any other Lender. Each Lender acknowledges that
it has not relied, and will not rely, on any of the Lenders so identified in
deciding to enter into this Agreement or any other Loan Document or in taking or
not taking action hereunder or thereunder.


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<PAGE>   93
                                   ARTICLE 10

                             Change in Circumstances
                          Affecting Eurodollar Advances

     Section 10.1 Eurodollar Basis Determination Inadequate or Unfair. If with
respect to any proposed Eurodollar Advance for any Interest Period, the
Administrative Agent determines after consultation with the Lenders that
deposits in Dollars (in the applicable amount) are not being offered to each of
the Lenders in the relevant market for such Interest Period, the Administrative
Agent shall forthwith give notice thereof to the Borrower and the Lenders,
whereupon until the Administrative Agent notifies the Borrower that the
circumstances giving rise to such situation no longer exist, the obligations of
any affected Lender to make Eurodollar Advances shall be suspended.

     Section 10.2 Illegality. If after the date hereof, the adoption of any
Applicable Law, or any change in any Applicable Law (whether adopted before or
after the Agreement Date), or any change in interpretation or administration
thereof by any governmental authority, central bank or comparable agency charged
with the interpretation or administration thereof, or compliance by any Lender
with any directive (whether or not having the force of law) of any such
authority, central bank or comparable agency, shall make it unlawful or
impossible for any Lender to make, maintain or fund Eurodollar Advances, such
Lender shall so notify the Administrative Agent, and the Administrative Agent
shall forthwith give notice thereof to the other Lenders and the Borrower.
Before giving any notice to the Administrative Agent pursuant to this Section
10.2, such Lender shall designate a different lending office if such designation
will avoid the need for giving such notice and will not, in the sole judgment of
such Lender, be otherwise materially disadvantageous to such Lender. Upon
receipt of such notice, notwithstanding anything contained in Article 2 hereof,
the Borrower shall repay in full the then outstanding principal amount of each
Eurodollar Advance of such Lender, together with accrued interest thereon and
any reimbursement required under Section 2.11 hereof, on either (a) the last day
of the then current Interest Period applicable to such affected Eurodollar
Advances if such Lender may lawfully continue to maintain and fund such
Eurodollar Advances to such day or (b) immediately if such Lender may not
lawfully continue to fund and maintain such affected Eurodollar Advances to such
day. Concurrently with repaying each affected Eurodollar Advance of such Lender,
notwithstanding anything contained in Article 2 or Article 3


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hereof, the Borrower may borrow a Base Rate Advance from such Lender, and such
Lender shall make such Advance, if so requested, in an amount such that the
outstanding principal amount of the Note held by such Lender shall equal the
outstanding principal amount of such Note immediately prior to such repayment.

     Section 10.3 Increased Costs.

     (a) If after the date hereof, the adoption of any Applicable Law, or any
change in any Applicable Law (whether adopted before or after the Agreement
Date), or any interpretation or change in interpretation or administration
thereof by any governmental authority, central bank or comparable agency charged
with the interpretation or administration thereof or compliance by any Lender
with any directive (whether or not having the force of law) of any such
authority, central bank or comparable agency:

          (1) shall subject any Lender to any tax, duty or other charge with
     respect to its obligation to make Eurodollar Advances, or shall change the
     basis of taxation of payments to any Lender of the principal of or interest
     on its Eurodollar Advances or in respect of any other amounts due under
     this Agreement, in respect of its Eurodollar Advances or its obligation to
     make Eurodollar Advances (except for changes in the rate or method of
     calculation of tax on the overall net income of such Lender); or

          (2) shall impose, modify or deem applicable any reserve (including,
     without limitation, any imposed by the Board of Governors of the Federal
     Reserve System, but excluding any included in an applicable Eurodollar
     Reserve Percentage or Domestic Reserve Percentage), special deposit,
     capital adequacy, assessment or other requirement or condition against
     assets of, deposits with or for the account of, or commitments or credit
     extended by, any Lender or shall impose on any Lender or the London
     interbank borrowing market or the New York certificate of deposit market
     any other condition affecting its obligation to make Eurodollar Advances or
     its Eurodollar Advances;

and the result of any of the foregoing is to increase the cost to such Lender of
making or maintaining any such Eurodollar Advances, or to reduce the amount of
any sum received or receivable by such Lender under this Agreement or under its
Note with respect thereto, then, within five (5) days after demand by such
Lender, the Borrower agrees to 


                                       93


<PAGE>   95
pay to such Lender such additional amount or amounts as will compensate such
Lender for such increased costs. Each Lender will promptly notify the Borrower
and the Administrative Agent of any event of which it has knowledge, occurring
after the date hereof, which will entitle such Lender to compensation pursuant
to this Section 10.3 and will designate a different lending office if such
designation will avoid the need for, or reduce the amount of, such compensation
and will not, in the sole judgment of such Lender, be otherwise disadvantageous
to such Lender.

     (b) Any Lender claiming compensation under this Section 10.3 shall provide
the Borrower with a written certificate setting forth the additional amount or
amounts to be paid to it hereunder and calculations therefor in reasonable
detail. Such certificate shall be presumptively correct, absent manifest error.
In determining such amount, such Lender may use any reasonable averaging and
attribution methods. If any Lender demands compensation under this Section 10.3,
the Borrower may at any time, upon at least five (5) Business Days' prior notice
to such Lender, prepay in full the then outstanding Eurodollar Advances of such
Lender, together with accrued interest thereon to the date of prepayment, along
with any reimbursement required under Section 2.11 hereof. Concurrently with
prepaying such Eurodollar Advances, the Borrower may borrow a Base Rate Advance
from such Lender, and such Lender shall, if so requested, make such Advance in
an amount such that the outstanding principal amount of the Note held by such
Lender shall equal the outstanding principal amount of such Note immediately
prior to such prepayment.

     Section 10.4 Effect On Other Advances. If notice has been given pursuant to
Section 10.1, 10.2 or 10.3 suspending the obligation of any Lender to make
Eurodollar Advances, or requiring Eurodollar Advances of any Lender to be repaid
or prepaid, then, unless and until such Lender notifies the Borrower that the
circumstances giving rise to such repayment no longer apply, all Advances which
would otherwise be made by such Lender as Eurodollar Advances affected shall, at
the option of the Borrower, be made instead as Base Rate Advances or the
unaffected type of Eurodollar Advances.


                                       94


<PAGE>   96
                                   ARTICLE 11

                                  Miscellaneous

     Section 11.1 Notices.

     (a) Unless otherwise specifically provided herein, all notices and other
communications under this Agreement shall be in writing and shall be deemed to
have been given three (3) days after deposit in the mail, designated as
certified mail, return receipt requested, postage-prepaid, or one (1) Business
Day after being entrusted to a reputable commercial overnight delivery service,
or when sent by telecopy addressed to the party to which such notice is directed
at its address determined as provided in this Section 11.1, except that notices
under Article 2 shall be effective only upon receipt. All notices and other
communications under this Agreement shall be given to the parties hereto at the
following addresses:

     (i) If to the Borrower, to it at:

               Western PCS Holding Corporation
               3650 131st Avenue, SE
               Bellevue, Washington 98006
               Attn: John Stanton
                       Chairman and Chief Executive Officer

          with a copy to:

               Rubin Baum Levin Constant & Friedman
               30 Rockefeller Plaza
               New York, New York  10112
               Attn:  Barry A. Adelman, Esq.

          and to:

               Alan R. Bender, Esq.
               General Counsel
               3650 131st Avenue, SE
               Suite 400
               Bellevue, Washington  98006

     (ii) If to the Administrative Agent, to it at:

               Toronto Dominion (Texas), Inc.
               909 Fannin, Suite 900
               Houston, Texas 77010
               Attn:  Manager, Agency


                                       95


<PAGE>   97
          with a copy to:

               TD Securities (USA) Inc.
               31 West 52nd Street
               New York, New York 10019-6101
               Attn:  Managing Director,
                       Communications Finance

          and to:

               Paul, Hastings, Janofsky & Walker LLP
               600 Peachtree Street, Suite 2400
               Atlanta, Georgia  30308-2222
               Attn:  Kevin Conboy, Esq.

         (iii) If to the Managing Agents, the Agents, the Co-Agents, or the
               Lenders, to them at the addresses set forth beside their names on
               Schedule 1.

Copies shall be provided to Persons other than parties hereto only in the case
of notices under Article 8 hereof.

     (b) Any party hereto may change the address to which notices shall be
directed under this Section 11.1 by giving ten (10) days' written notice of such
change to the other parties.

     Section 11.2 Expenses. The Borrower will promptly pay, or reimburse:

     (a) all reasonable out-of-pocket expenses of the Administrative Agent in
connection with the preparation, negotiation, execution and delivery of this
Agreement and the other Loan Documents, and the transactions contemplated
hereunder and thereunder and the making of the initial Advance hereunder
(whether or not such Advance is made), including, but not limited to, the fees
and disbursements of Paul, Hastings, Janofsky & Walker LLP, special counsel for
the Administrative Agent and its Affiliates;

     (b) all reasonable out-of-pocket expenses of the Administrative Agent in
connection with the administration of the transactions contemplated in this
Agreement or the other Loan Documents, the restructuring and "work out" of such
transactions, and the preparation, negotiation, execution and delivery of any
waiver, amendment or consent by the Administrative Agent and the Lenders
relating to this Agreement or the other Loan Documents, including, but not
limited to, the fees and disbursements of any experts, 


                                       96


<PAGE>   98
agents or consultants and of special counsel for the Administrative Agent, but
excluding any assignment fee pursuant to Section 11.5(b) hereof; and

     (c) all out-of-pocket costs and expenses of obtaining performance under
this Agreement or the other Loan Documents and all out-of-pocket costs and
expenses of collection if an Event of Default occurs in the payment of the
Notes, which in each case shall include reasonable fees and out-of-pocket
expenses of special counsel for the Administrative Agent.

     Section 11.3 Waivers. The rights and remedies of the Administrative Agent
and the Lenders under this Agreement and the other Loan Documents shall be
cumulative and not exclusive of any rights or remedies which they would
otherwise have. No failure or delay by the Administrative Agent or the Lenders,
or any of them, in exercising any right, shall operate as a waiver of such
right. The Administrative Agent and the Lenders expressly reserve the right to
require strict compliance with the terms of this Agreement in connection with
any future funding of a request for an Advance. In the event the Lenders decide
to fund an Advance at a time when the Borrower is not in strict compliance with
the terms of this Agreement, such decision by the Lenders shall not be deemed to
constitute an undertaking by the Lenders to fund any further Advances or
preclude the Lenders and the Administrative Agent from exercising any rights
available under the Loan Documents or at law or equity. Any waiver or indulgence
granted by the Administrative Agent, the Lenders or the Majority Lenders shall
not constitute a modification of this Agreement, except to the extent expressly
provided in such waiver or indulgence, or constitute a course of dealing at
variance with the terms of this Agreement such as to require further notice of
their intent to require strict adherence to the terms of this Agreement in the
future.

     Section 11.4 Set-Off. In addition to any rights now or hereafter granted
under Applicable Law and not by way of limitation of any such rights, upon the
occurrence of an Event of Default and during the continuation thereof, the
Administrative Agent and the Lenders are hereby authorized by the Borrower at
any time or from time to time, without notice to the Borrower or to any other
Person, any such notice being hereby expressly waived, to set off and to
appropriate and to apply any and all deposits (general or special, time or
demand, including, but not limited to, Indebtedness evidenced by certificates of
deposit, in each case whether matured or unmatured) and any other Indebtedness
at any time held or owing by any Lender or the 


                                       97


<PAGE>   99
Administrative Agent to or for the credit or the account of the Borrower or any
of its Restricted Subsidiaries against and on account of the Obligations
irrespective of whether (a) any Lender or the Administrative Agent shall have
made any demand hereunder or (b) the Administrative Agent shall have declared
the principal of and interest on the Loans and other amounts due hereunder to be
due and payable as permitted by Section 8.2 and although such Obligations or any
of them, shall be contingent or unmatured. Upon direction by the Administrative
Agent with the consent of the Majority Lenders, each Lender holding deposits of
the Borrower or any of its Restricted Subsidiaries shall exercise its set-off
rights as so directed.

     Section 11.5 Assignment.

     (a) The Borrower may not assign or transfer any of its rights or
obligations hereunder without the prior written consent of each of the Lenders.

     (b) Each Lender may enter freely into participation agreements with respect
to or otherwise grant participations in its Loans to one or more banks or other
lenders or financial institutions; provided, however, that (i) such Lender's
obligations hereunder shall remain unchanged, (ii) such Lender shall remain
solely responsible to the other parties hereto for the performance of such
obligations, (iii) the participant shall not be entitled by the benefit of its
participation to vote or otherwise take action under this Agreement or any other
Loan Document, except with respect to the matters referred to in items (a), (b),
(c), (d), (e), (f) and (g) of Section 11.12 hereof, and (iv) the Borrower
(unless there exists at the time of such participation an Event of Default
hereunder) shall have the right to consent to a proposed participant (such
consent not to be unreasonably withheld or delayed) and shall continue to deal
solely and directly with such Lender in connection with such Lender's rights and
obligations hereunder. In addition, each Lender may (x) sell or assign up to one
hundred percent (100%) of its rights hereunder and under the other Loan
Documents to any Federal Reserve Bank without limitation; and (y) sell or assign
up to one hundred percent (100%) of its rights hereunder and under the other
Loan Documents to any other Person on an assignment basis, provided that (A) (i)
such assignment is to an Affiliate of the assignor, an Approved Fund, another
Lender, or any Person shown as of the Agreement Date on Schedule 1 as an
Approved Fund, or (ii) the Borrower (unless there exists at the time of such
assignment an Event of Default hereunder) and the Administrative Agent have
given their prior written 


                                       98


<PAGE>   100
consent to the proposed assignee of a Lender hereunder, which consents shall not
be unreasonably delayed or withheld, provided that such consents may be
reasonably withheld if the proposed assignee is subject to withholding tax of
the sort referred to in Section 2.14 hereof, (B) the assignee assumes a pro rata
share of the assignor Lender's obligations hereunder determined by the
percentage of the Revolving Loan Commitment or the appropriate Term Loan
assigned, as applicable, for the period from the date of the assignment through
the Revolving Loan Maturity Date with respect to an assignment of a Revolving
Loan Commitment or a Tranche A Term Loan, or the Final Maturity Date with
respect to an assignment of a Tranche B Term Loan, and (C) each such assignment
shall be in a principal amount of not less than the lesser of the entire amount
of such Lender's interest hereunder or $5,000,000, unless an assignment is from
one Lender to another, or to an Affiliate of another Lender, or to an Approved
Fund, in which case there shall be no minimum assignment amount. Each Lender who
sells or assigns a portion of its Loans pursuant hereto shall pay to the
Administrative Agent an assignment fee of $3,500 with respect to each
assignment, such fee to be paid to the Administrative Agent not later than the
effective date of the assignment of the Loan relating thereto; provided however,
that no such fee shall be payable in the case of an assignment to another
Lender, an Affiliate of a Lender or an Approved Fund; and provided, further
that, in the case of contemporaneous assignments by a Lender to more than one
fund managed by the same investment advisor (which funds are not then Lenders
hereunder), only a single such $3,500 fee shall be payable for all such
contemporaneous assignments. Each Lender agrees to provide the Administrative
Agent, the Arranging Agents, and the Borrower with written notice of the
assignment of all or part of its rights hereunder, and the Administrative Agent
shall keep a record of all such assignments in order to be able to calculate the
Commitment Ratios of the Lenders as of any time. All assignments by any of the
Lenders of any interests hereunder shall be made pursuant to an Assignment and
Assumption Agreement substantially in the form attached hereto as Exhibit R.
Each Lender may provide any proposed participant or assignee with confidential
information provided to such Lender regarding the Borrower and its Subsidiaries
on a confidential basis, and such participant or assignee shall agree to
maintain such confidentiality. Further, each permitted assignee of any portion
of the Loans shall be entitled to the benefits of Sections 2.11 and 2.13 and
Article 10 hereof and all other provisions hereof and of the other Loan
Documents as a 'Lender' hereunder.


                                       99


<PAGE>   101
     (c) Except as specifically set forth in Section 11.5(b) hereof, nothing in
this Agreement or the Notes, expressed or implied, is intended to or shall
confer on any Person other than the respective parties hereto and thereto and
their successors and assignees permitted hereunder and thereunder any benefit or
any legal or equitable right, remedy or other claim under this Agreement or the
Notes.

     (d) The provisions of this Section 11.5 shall not apply to any purchase of
participations among the Lenders pursuant to Section 2.12 hereof.

     Section 11.6 Accounting Principles.

     (a) Except as set forth in the following sentence, references in this
Agreement to GAAP shall be to such principles as in effect from time to time,
and all accounting terms used herein without definition shall be used as defined
under GAAP. All references to Operating Cash Flow, Total Debt, Fixed Charges,
Debt Service, and other such terms shall be deemed to refer to such items of the
Borrower and its Restricted Subsidiaries on a consolidated basis, consistently
applied, unless otherwise indicated herein.

     (b) With respect to any determination of whether the Borrower shall be
permitted to make an Investment, Acquisition, Restricted Payment, or the like,
which determination depends upon whether the Borrower's aggregate amount of such
aforementioned items equals or exceeds a sum, one of whose constituents is
Available Equity or proceeds of Subordinated Debt, the Available Equity or
proceeds of Subordinated Debt used for such determination may not be
double-counted.

     Section 11.7 Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original, but all such
separate counterparts shall together constitute but one and the same instrument.

     Section 11.8 Governing Law. This Agreement and the Notes shall be construed
in accordance with and governed by the internal laws of the State of New York
applicable to agreements made and to be performed in New York. If any action or
proceeding shall be brought by the Administrative Agent or any Lender in order
to enforce any right or remedy under this Agreement or under any Note, the
Borrower hereby consents and will, and the Borrower will cause each 


                                      100


<PAGE>   102
Subsidiary to, submit to the jurisdiction of any state or federal court of
competent jurisdiction sitting within the area comprising the Southern District
of New York on the date of this Agreement. The Borrower, for itself and on
behalf of its Subsidiaries, hereby agrees that service of the summons and
complaint and all other process which may be served in any such suit, action or
proceeding may be effected by mailing by registered mail a copy of such process
to the offices of the Borrower at the address given in Section 11.1 hereof and
that personal service of process shall not be required. Nothing herein shall be
construed to prohibit service of process by any other method permitted by law or
the bringing of any suit, action or proceeding in any other jurisdiction. The
Borrower agrees that final judgment in such suit, action or proceeding shall be
conclusive and may be enforced in any other jurisdiction by suit on the judgment
or in any other manner provided by Applicable Law.

     Section 11.9 Severability. Any provision of this Agreement which is
prohibited or unenforceable in any jurisdiction shall be ineffective to the
extent of such prohibition or unenforceability without invalidating the
remaining provisions hereof in that jurisdiction or affecting the validity or
enforceability of such provision in any other jurisdiction.

     Section 11.10 Interest.

     (a) In no event shall the amount of interest due or payable hereunder or
under the Notes exceed the maximum rate of interest allowed by Applicable Law,
and in the event any such payment is inadvertently made by the Borrower or
inadvertently received by any Lender, then such excess sum shall be credited as
a payment of principal, unless the Borrower shall notify the Administrative
Agent or such Lender in writing that it elects to have such excess returned
forthwith. It is the express intent hereof that the Borrower not pay and the
Lenders not receive, directly or indirectly in any manner whatsoever, interest
in excess of that which may legally be paid by the Borrower under Applicable
Law.

     (b) Notwithstanding the use by the Lenders of the Base Rate, the Federal
Funds Rate, and the Eurodollar Rate as reference rates for the determination of
interest on the Loans, the Lenders shall be under no obligation to obtain funds
from any particular source in order to charge interest to the Borrower at
interest rates related to such reference rates.


                                      101


<PAGE>   103
     Section 11.11 Table of Contents and Headings. The Table of Contents and the
headings of the various subdivisions used in this Agreement are for convenience
only and shall not in any way modify or amend any of the terms or provisions
hereof, nor be used in connection with the interpretation of any provision
hereof.

     Section 11.12 Amendment and Waiver. Neither this Agreement nor any other
Loan Document (other than Interest Hedge Agreements) nor any term hereof or
thereof may be amended orally, nor may any provision hereof or thereof be waived
orally but only by an instrument in writing signed by (or, in the case of
Security Documents executed by the Administrative Agent for itself and on behalf
of the Lenders, signed by the Administrative Agent and approved by) the Majority
Lenders and, in the case of an amendment, by the Borrower, except that in the
event of (a) any increase in the amount of the Revolving Loan Commitment, (b)
any delay or extension in the terms of repayment or change in the order of
application of repayment of the Loans provided in Section 2.4 or Section 2.8
hereof, (c) any reduction in principal, interest or fees due hereunder or
postponement of the payment thereof, (d) any release of any substantial portion
of the Collateral for the Loans other than in connection with a sale or
disposition otherwise permitted hereunder, or any failure to take Collateral to
which the Lenders are otherwise entitled pursuant to Section 5.13 or 5.14
hereof, (e) any waiver of any Default due to the failure by the Borrower to pay
any sum due to any of the Lenders hereunder, (f) any release of any Guaranty (or
any guarantor thereunder) of all or any portion of the Obligations, except in
connection with a merger, sale or other disposition otherwise permitted
hereunder, or (g) any amendment of this Section 11.12, or of the definition of
Majority Lenders, or of any portion of Sections 2.10, 2.12, 5.11 or Article 10
as they relate to the relative priority of payment among the Obligations, or any
other provision of this Agreement or any of the other Loan Documents
specifically requiring the consent or approval of each of the Lenders, any
amendment or waiver or consent may be made only by an instrument in writing
signed by (or, in the case of Security Documents executed by the Administrative
Agent for itself and on behalf of the Lenders, signed by the Administrative
Agent and approved by) each of the Lenders and, in the case of an amendment, by
the Borrower. Any amendment to any provision hereunder governing the rights,
obligations, or liabilities of the Administrative Agent in its capacity as such,
may be made only by an instrument in writing signed by the Administrative Agent
and by each of the Lenders.


                                      102


<PAGE>   104
     Section 11.13 Entire Agreement. Except as otherwise expressly provided
herein, this Agreement and the other documents described or contemplated herein
embody the entire agreement and understanding among the parties hereto and
thereto and supersede all prior agreements and understandings relating to the
subject matter hereof and thereof.

     Section 11.14 Other Relationships. No relationship created hereunder or
under any other Loan Document shall in any way affect the ability of the
Administrative Agent or its Affiliates and each Lender or its respective
Affiliates to enter into or maintain business relationships with the Borrower or
any of its Affiliates beyond the relationships specifically contemplated by this
Agreement and the other Loan Documents.

     Section 11.15 Directly or Indirectly. If any provision in this Agreement
refers to any action taken or to be taken by any Person, or which such Person is
prohibited from taking, such provision shall be applicable whether such action
is taken directly or indirectly by such Person, whether or not expressly
specified in such provision.

     Section 11.16 Reliance on and Survival of Various Provisions. All
covenants, agreements, statements, representations and warranties made herein or
in any certificate delivered pursuant hereto (i) shall be deemed to have been
relied upon by the Administrative Agent and each of the Lenders notwithstanding
any investigation heretofore or hereafter made by them, and (ii) shall survive
the execution and delivery of the Notes and shall continue in full force and
effect so long as any Note is outstanding and unpaid. Any right to
indemnification hereunder, including, without limitation, rights pursuant to
Sections 2.11, 2.13, 5.11, 9.11, 10.3 and 11.2 hereof, shall survive the
termination of this Agreement and the payment and performance of all other
Obligations.

     Section 11.17 Senior Debt. The Indebtedness of the Borrower evidenced by
the Notes is secured by the Security Documents and is intended by the parties
hereto to be in parity with the Interest Hedge Agreements in effect from time to
time between the Borrower and any Lender and senior in right of payment to all
other Indebtedness for Money Borrowed of the Borrower.

     Section 11.18 Obligations Several. The obligations of the Administrative
Agent and each of the Lenders hereunder are several, not joint.


                                      103


<PAGE>   105
     Section 11.19 Confidentiality. The Lenders shall hold all non-public,
proprietary or confidential information (which has been identified as such by
the Borrower) obtained pursuant to the requirements of this Agreement in
accordance with their customary procedures for handling confidential information
of this nature and in accordance with safe and sound banking and investment
practices; however, the Lenders may make disclosure of any such information to
their examiners, Affiliates, internal and outside auditors, counsel,
consultants, appraisers and other professional advisors in connection with this
Agreement or as reasonably required by any proposed syndicate member or any
proposed transferee or participant in connection with the contemplated transfer
of any Note or participation therein or as required or requested by any
governmental authority or representative thereof or in connection with the
enforcement hereof or of any Loan Document or related document or pursuant to
legal process or with respect to any litigation between or among the Borrower
and any of the Lenders. In no event shall any Lender be obligated or required to
return any materials furnished to it by the Borrower. In addition, the Lenders
may make disclosure of such information to any direct or indirect contractual
counterparty in swap agreements or such contractual counterparty's professional
advisors (so long as such contractual counterparty or professional advisors to
such contractual counterparty agrees to be bound by the provisions of this
Section 11.19). The foregoing provisions shall not apply to a Lender with
respect to information that (i) is or becomes generally available to the public
(other than through a breach of this Section 11.19 by such Lender), (ii) is
already in the possession of such Lender on a nonconfidential basis, or (iii)
comes into the possession of or is independently developed by such Lender in a
manner not known to such Lender to involve a breach of a duty of confidentiality
owing to the Borrower.

                                   ARTICLE 12

                              Waiver of Jury Trial

     Section 12.1 Waiver of Jury Trial. THE BORROWER, FOR ITSELF AND ON BEHALF
OF ITS SUBSIDIARIES, AND THE ADMINISTRATIVE AGENT AND EACH OF THE LENDERS,
HEREBY AGREE TO WAIVE AND HEREBY WAIVE THE RIGHT TO A TRIAL BY JURY IN ANY COURT
AND IN ANY ACTION OR PROCEEDING OF ANY TYPE IN WHICH THE BORROWER, ANY OF THE
BORROWER'S SUBSIDIARIES, ANY OF THE LENDERS, OR THE ADMINISTRATIVE AGENT, OR ANY
OF THEIR RESPECTIVE SUCCESSORS OR ASSIGNS, IS A PARTY, AS TO ALL MATTERS AND
THINGS ARISING DIRECTLY OR INDIRECTLY OUT OF 


                                      104


<PAGE>   106
THIS AGREEMENT, ANY OF THE NOTES OR THE OTHER LOAN DOCUMENTS.


                                      105


<PAGE>   107
     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed and delivered as of the date first appearing above.

BORROWER:                            WESTERN PCS HOLDING CORPORATION, A
                                     DELAWARE CORPORATION


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________

                                     Attest:__________________________________
                                        Name:_________________________________
                                        Title:________________________________




ADMINISTRATIVE
AGENT:                               TORONTO DOMINION (TEXAS), INC.


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
Signature Page 1


<PAGE>   108
ARRANGING AGENTS:                    TD SECURITIES (USA) INC.


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________




                                     NATIONSBANC MONTGOMERY SECURITIES LLC

                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________




                                     BARCLAYS CAPITAL


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________




                                     J.P. MORGAN SECURITIES INC.


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________




                                     CHASE SECURITIES INC.


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________




WESTERN PCS LOAN AGREEMENT
Signature Page 2

<PAGE>   109
DOCUMENTATION
AGENT:                               J.P. MORGAN SECURITIES INC.


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________


CO-SYNDICATION
AGENTS:                              CHASE SECURITIES INC.


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



                                     NATIONSBANC MONTGOMERY SECURITIES LLC


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



CO-AGENTS:                           THE BANK OF NEW YORK


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



                                     THE BANK OF NOVA SCOTIA


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



                                     PNC BANK NATIONAL ASSOCIATION


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________




WESTERN PCS LOAN AGREEMENT
Signature Page 3

<PAGE>   110
                                     COOPERATIEVE CENTRALE RAIFFEISEN-
                                     BOERENLEENBANK B.A., "RABOBANK
                                     NEDERLAND", NEW YORK BRANCH


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



                                     BANQUE PARIBAS


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



LENDERS:                             TORONTO DOMINION (TEXAS), INC.


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



                                     NATIONSBANK, N.A.


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________




WESTERN PCS LOAN AGREEMENT
Signature Page 5

<PAGE>   111
                                     BARCLAYS BANK, PLC


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________




WESTERN PCS LOAN AGREEMENT
Signature Page 6

<PAGE>   112
                                     MORGAN GUARANTY TRUST COMPANY
                                      OF NEW YORK


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
Signature Page 7

<PAGE>   113
                                     THE CHASE MANHATTAN BANK


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________




WESTERN PCS LOAN AGREEMENT
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<PAGE>   114
                                     BANK OF AMERICA NATIONAL TRUST & SAVINGS
                                     ASSOCIATION


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



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<PAGE>   115
                                     CREDIT LYONNAIS NEW YORK BRANCH


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   116



                                     GENERAL ELECTRIC CAPITAL CORPORATION


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________




WESTERN PCS LOAN AGREEMENT
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<PAGE>   117



                                     GOLDMAN SACHS CREDIT PARTNERS, L.P.


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   118



                                     SOCIETE GENERALE


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________




WESTERN PCS LOAN AGREEMENT
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<PAGE>   119
                                     THE BANK OF NEW YORK


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



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<PAGE>   120
                                     THE BANK OF NOVA SCOTIA


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



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<PAGE>   121
                                     FIRST UNION NATIONAL BANK


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   122
                                     PNC BANK NATIONAL ASSOCIATION


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   123
                                     COOPERATIEVE CENTRALE RAIFFEISEN-
                                     BOERENLEENBANK B.A., "RABOBANK
                                     NEDERLAND", NEW YORK BRANCH


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   124
                                     CIBC INC.


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   125
                                     THE CIT GROUP/EQUIPMENT FINANCING, INC.


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   126
                                     DRESDNER BANK AG, NEW YORK AND
                                      GRAND CAYMAN BRANCHES


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   127
                                     EXPORT DEVELOPMENT CORPORATION


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   128
                                     FLEET NATIONAL BANK


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   129
                                     FREMONT FINANCIAL CORPORATION


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   130
                                     THE ROYAL BANK OF SCOTLAND PLC


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   131
                                     SKANDINAVISKA ENSKILDA BANKEN
                                      CORPORATION


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   132
                                     THE SUMITOMO TRUST AND BANKING CO.,
                                     LTD., NEW YORK BRANCH


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   133
                                     U.S. BANK NATIONAL ASSOCIATION


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   134
                                     KZH-IV CORPORATION


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



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<PAGE>   135
                                     AG CAPITAL FUNDING PARTNERS, L.P.
                                     BY: ANGELO, GORDON & CO., L.P.,
                                     AS INVESTMENT ADVISOR


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   136
                                     APPALOOSA


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



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<PAGE>   137
                                     BALANCED HIGH-YIELD FUND I LTD.
                                     BY: BHF-BANK AKTIENGESELLSCHAFT
                                         ACTING THROUGH ITS NEW YORK BRANCH
                                         AS ATTORNEY-IN-FACT


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   138
                                     BDC FINANCE L.L.C.


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   139
                                     KZH-CNC CORPORATION


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   140
                                     KZH-CYPRESSTREE-1 CORPORATION


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   141
                                     SENIOR DEBT PORTFOLIO
                                     BY: BOSTON MANAGEMENT AND RESEARCH,
                                     AS INVESTMENT ADVISOR


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   142
                                     FIRST DOMINION


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   143
                                     HARCH


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   144
                                     SENIOR HIGH INCOME PORTFOLIO, INC.


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   145
                                     KZH-ING-2 CORPORATION


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   146
                                     DEBT STRATEGIES FUND, INC.


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   147
                                     MERRILL LYNCH SENIOR FLOATING RATE
                                     FUND, INC. PRIME RATE PORTFOLIO


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   148
                                     MOUNTAIN CAPITAL ADVISORS


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   149
                                     OCTAGON LOAN TRUST
                                     BY: OCTAGON CREDIT INVESTORS AS MANAGER


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   150
                                     PILGRIM AMERICA PRIME RATE TRUST
                                     BY: PILGRIM AMERICA INVESTMENTS, INC.
                                         AS ITS INVESTMENTS MANAGER


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   151
                                     PACIFIC INVESTMENT MANAGEMENT CO.
                                     (PIMCO)


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   152
                                     PAM CAPITAL FUNDING LP
                                     BY: HIGHLAND CAPITAL MANAGEMENT, L.P.,
                                         AS COLLATERAL MANAGER


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   153
                                     DLJ CAPITAL FUNDING CORP.


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   154
                                     STEIN ROE & FARNHAM INCORPORATED, AS
                                     AGENT FOR KEYPORT LIFE INSURANCE COMPANY


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   155
                                     KZH-SOLEIL-2 CORPORATION


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   156
                                     VAN KAMPEN AMERICAN CAPITAL PRIME RATE
                                     INCOME TRUST


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   157
                                     BANQUE PARIBAS


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   158
                                     UNION BANK OF CALIFORNIA


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   159
                                     CYPRESSTREE INVESTMENT FUND, LLC

                                     By: CypressTree Investment Management
                                         Company, Inc. its Managing Member


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
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<PAGE>   160
                                     CYPRESSTREE INVESTMENT MANAGEMENT
                                     COMPANY, INC.
                                     AS: ATTORNEY-IN-FACT AND ON BEHALF OF
                                     FIRST ALLMERICA FINANCIAL LIFE
                                     INSURANCE COMPANY AS PORTFOLIO MANAGER


                                     By:______________________________________
                                        Name:_________________________________
                                        Title:________________________________



WESTERN PCS LOAN AGREEMENT
Signature Page 55

<PAGE>   161
                                TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                                                                                    Page
                                                                                                    ----
<S>                                                                                                 <C>
ARTICLE 1 Definitions ..........................................................................      1

ARTICLE 2 Loans ................................................................................     26
          Section 2.1 The Loans ................................................................     26
          Section 2.2 Manner of Borrowing and Disbursement .....................................     27
          Section 2.3 Interest .................................................................     30
          Section 2.4 Repayment ................................................................     33
          Section 2.5 Fees .....................................................................     35
          Section 2.6 Prepayments ..............................................................     36
          Section 2.7 Borrower's Optional Cancellation of
                      the Revolving Loan Commitment ............................................     37
          Section 2.8 Mandatory Prepayments ....................................................     37
          Section 2.9 Notes; Loan Accounts .....................................................     39
          Section 2.10 Manner of Payment .......................................................     40
          Section 2.11 Reimbursement ...........................................................     41
          Section 2.12 Pro Rata Treatment ......................................................     41
          Section 2.13 Capital Adequacy ........................................................     43
          Section 2.14 Lender Tax Forms ........................................................     43

ARTICLE 3 Conditions Precedent .................................................................     44
          Section 3.1 Conditions Precedent to Initial Advance ..................................     44
          Section 3.2 Conditions Precedent to Each Advance .....................................     48
          Section 3.3 Conditions Precedent to Initial Advance
                      of the Revolving Loans ...................................................     49

ARTICLE 4 Representations and Warranties .......................................................     49
          Section 4.1 Representations and Warranties ...........................................     49
          Section 4.2 Survival of Representations and
                      Warranties, etc ..........................................................     58

ARTICLE 5 General Covenants ....................................................................     58
          Section 5.1 Preservation of Existence and Similar Matters ............................     59
          Section 5.2 Business; Compliance with Applicable Law .................................     59
          Section 5.3 Maintenance of Properties ................................................     59
          Section 5.4 Accounting Methods and Financial Records .................................     59
          Section 5.5 Insurance ................................................................     60
          Section 5.6 Payment of Taxes and Claims ..............................................     61
          Section 5.7 Visits and Inspections ...................................................     61
          Section 5.8 Payment of Indebtedness; Loans ...........................................     61
          Section 5.9 Use of Proceeds ..........................................................     62
</TABLE>


<PAGE>   162
<TABLE>
<CAPTION>
                                                                                                    Page
                                                                                                    ----
<S>                                                                                                 <C>
          Section 5.10 Real Estate .............................................................     62
          Section 5.11 Indemnity ...............................................................     62
          Section 5.12 Interest Rate Hedging ...................................................     63
          Section 5.13 Covenants Regarding Formation of Restricted Subsidiaries and the 
                       Making of Investments and Acquisitions ..................................     64
          Section 5.14 Designation of Unrestricted Subsidiaries
                       as Restricted Subsidiaries ..............................................     65
          Section 5.15 Payment of Wages ........................................................     65

ARTICLE 6 Information Covenants ................................................................     66
          Section 6.1 Quarterly Financial Statements and Information ...........................     66
          Section 6.2 Annual Financial Statements and Information ..............................     67
          Section 6.3 Performance Certificates .................................................     67
          Section 6.4 Copies of Other Reports ..................................................     68
          Section 6.5 Notice of Litigation and Other Matters ...................................     68

ARTICLE 7 Negative Covenants ...................................................................     69
          Section 7.1 Indebtedness of the Borrower and its Restricted Subsidiaries .............     70
          Section 7.2 Limitation on Liens ......................................................     70
          Section 7.3 Amendment and Waiver .....................................................     70
          Section 7.4 Liquidation, Merger, Disposition of Assets ...............................     71
          Section 7.5 Limitation on Guaranties .................................................     71
          Section 7.6 Investments and Acquisitions .............................................     72
          Section 7.7 Restricted Payments and Purchases ........................................     75
          Section 7.9 Stage One -- Ratio of Total Debt to Contributed Capital ..................     76
          Section 7.10 Stage One-- Minimum Annualized Revenues .................................     76
          Section 7.11 Stage One -- Maximum Capital Expenditures ...............................     76
          Section 7.12 Stage Two -- Ratio of Operating Cash Flow to Cash Interest Expense ......     77
          Section 7.13 Stage Two -- Fixed Charge Coverage Ratio ................................     77
          Section 7.14 Stage Two-- Leverage Ratios .............................................     77
          Section 7.15 Stage Two-- Annualized Operating Cash
                       Flow to Pro Forma Debt Service Ratio ....................................     77
          Section 7.16 Affiliate Transactions ..................................................     78
          Section 7.17 Real Estate .............................................................     78
          Section 7.18 ERISA Liabilities .......................................................     78
          Section 7.19 New Unrestricted Subsidiaries ...........................................     78
          Section 7.20 Limitation on Preferred Stock of Restricted Subsidiaries ................     78
</TABLE>


<PAGE>   163
<TABLE>
<CAPTION>
                                                                                                    Page
                                                                                                    ----
<S>                                                                                                 <C>
ARTICLE 8 Default ..............................................................................     79
          Section 8.1 Events of Default ........................................................     79
          Section 8.2 Remedies .................................................................     83
          Section 8.3 Payments Subsequent to Declaration of Event of Default ...................     84

ARTICLE 9 The Administrative Agent .............................................................     85
          Section 9.1 Appointment and Authorization ............................................     85
          Section 9.2 Interest Holders .........................................................     86
          Section 9.3 Consultation with Counsel ................................................     86
          Section 9.4 Documents ................................................................     86
          Section 9.5 Administrative Agent and Affiliates ......................................     86
          Section 9.6 Responsibility of the Administrative Agent ...............................     86
          Section 9.7 Security Documents .......................................................     87
          Section 9.8 Action by the Administrative Agent .......................................     87
          Section 9.9 Notice of Default or Event of Default ....................................     88
          Section 9.10 Responsibility Disclaimed ...............................................     88
          Section 9.11 Indemnification .........................................................     89
          Section 9.12 Credit Decision .........................................................     89
          Section 9.13 Successor Administrative Agent ..........................................     90
          Section 9.14 Delegation of Duties ....................................................     91

ARTICLE 10 Change in Circumstances Affecting Eurodollar Advances ...............................     91
          Section 10.1 Eurodollar Basis Determination Inadequate or Unfair  ....................     91
          Section 10.2 Illegality ..............................................................     92
          Section 10.3 Increased Costs .........................................................     93
          Section 10.4 Effect On Other Advances ................................................     94

ARTICLE 11 Miscellaneous .......................................................................     94
          Section 11.1 Notices .................................................................     94
          Section 11.2 Expenses ................................................................     96
          Section 11.3 Waivers .................................................................     97
          Section 11.4 Set-Off .................................................................     97
          Section 11.5 Assignment ..............................................................     98
          Section 11.6 Accounting Principles ...................................................     100
          Section 11.7 Counterparts ............................................................     100
          Section 11.8 Governing Law ...........................................................     100
          Section 11.9 Severability ............................................................     101
          Section 11.10 Interest ...............................................................     101
          Section 11.11 Table of Contents and Headings .........................................     101
          Section 11.12 Amendment and Waiver ...................................................     101
          Section 11.13 Entire Agreement .......................................................     102
          Section 11.14 Other Relationships ....................................................     103
          Section 11.15 Directly or Indirectly .................................................     103
          Section 11.16 Reliance on and Survival of Various Provisions .........................     103
          Section 11.17 Senior Debt ............................................................     103
</TABLE>


<PAGE>   164
<TABLE>
<CAPTION>
                                                                                                    Page
                                                                                                    ----
<S>                                                                                                 <C>
          Section 11.18 Obligations Several ....................................................     103
          Section 11.19 Confidentiality ........................................................     103

ARTICLE 12 Waiver of Jury Trial ................................................................     104
          Section 12.1 Waiver of Jury Trial ....................................................     104
</TABLE>


                                    EXHIBITS

<TABLE>
<S>         <C>
Exhibit A - Form of Borrower's Pledge Agreement
Exhibit B - Form of Certificate of Financial
            Condition
Exhibit C   Form of Performance Certificate
Exhibit D - Form of Request for Advance
Exhibit E - Form of Revolving Note
Exhibit F - Form of Security Agreement
Exhibit G - Form of Subsidiary Guaranty
Exhibit H - Form of Subsidiary Pledge Agreement
Exhibit I - Form of Subsidiary Security Agreement
Exhibit J - Form of Tranche A Term Note
Exhibit K - Form of Tranche B Term Note
Exhibit L - Form of Use of Proceeds Letter
Exhibit M - Form of VoiceStream Guaranty
Exhibit N - Form of VoiceStream Pledge Agreement
Exhibit O - Form of Borrower's Loan Certificate
Exhibit P - Form of Subsidiary Loan Certificate
            (Corporation)
Exhibit Q - Form of Subsidiary Loan Certificate
            (Partnership)
Exhibit R - Form of Assignment and Assumption
            Agreement
</TABLE>


                                    SCHEDULES

<TABLE>
<S>          <C>
Schedule 1 - Allocation of Commitments among Lenders, and
             Lenders' Addresses for Notice
Schedule 2 - Licenses
Schedule 3 - Liens of Record as of the Agreement Date
Schedule 4 - Subsidiaries (including designation of
             Subsidiaries as Restricted and Unrestricted
             Subsidiaries) and Investments of the
             Borrower
Schedule 5 - Issues Pertaining to Necessary
             Authorizations and Licenses
Schedule 6 - Litigation
Schedule 7 - Liabilities and Losses
Schedule 8 - Agreements with Affiliates, etc.
Schedule 9 - Real Estate
</TABLE>