Document:

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                                                                    EXHIBIT 4.7

                                 EUPHONIX, INC.
                      AMENDMENT TO SECURED PROMISSORY NOTE
                              DATED MARCH 15, 2001

       This agreement dated November 29, 2001 (this "Amendment") amends the
Secured Promissory Note (the "Note"), dated March 15, 2001 by and among
Euphonix, Inc., a California corporation ("Borrower"), Dieter Meier and Walter
Bosch (each an "Investor" and together the "Investors") as amended up to the
date of this Amendment. This Amendment will become effective immediately prior
to the date of the Secured Promissory Note to be executed (the "Execution Date")
in connection with the Financing (as defined below). Capitalized terms not
defined here have the meaning set forth in the Note.

                                    RECITALS

       A. The Borrower has arranged for a debt financing of up to $6 million
(the "Financing") that is contingent on the Investors agreeing to amend the Note
to among other things, extend the Maturity Date and reduce the interest payable
on the Note in exchange for increasing the number of shares issuable to
Investors upon conversion of the Note.

       B. Subsection H.6 of the Note provides that the Note may be amended by a
written instrument signed by Borrower and the Lender.

       NOW, THEREFORE, in consideration of the mutual promises set forth herein,
and for other good and valuable consideration, the receipt and sufficiency of
which is hereby acknowledged, the parties agree as follows:

                              ARTICLE I: AMENDMENTS

       1. Subsection B of the Note is hereby amended by replacing the first
sentence with the following sentences:

       "Interest shall accrue with respect to Advances on the principal sum
       hereunder at the per annum rate of eight percent (8%), net of any
       deductions or withholding taxes. The reduction in interest payable will
       be retroactive to the date of each advance."

       2. Subsection C.1 of the Note is hereby amended by replacing it in its
entirety by the following new subsection:

       "Scheduled Payment. Subject to other provisions of this Note, the
       outstanding principal sum of this Note, together with the accrued
       interest thereon, shall be due and payable on December 31, 2003,
       according to the Pro Rata Share set forth opposite each Investor's name
       as set forth on Exhibit A."

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       3. Subsection C.5(a)(ii) of the Note is hereby amended by replacing it in
its entirety by the following new provision:

       "(ii) the lower of: (A) $0.35 or (B) the average of the closing price per
       share for the 3 trading days immediately preceding the Execution Date,
       provided, however that the price per share as determined in this clause
       (B) can be no lower than $0.02 per share."

       4. Subsection C.5(c) of the Note is hereby amended by replacing it in its
entirety by the following new provision:

       "Notwithstanding anything herein to the contrary, unless waived by the
       holders of a majority of the outstanding principal amount of this Note,
       the outstanding principal sum from all Advances as of the date thereof
       and all accrued interest thereon, shall accelerate and become due and
       payable in full, according to each Investor's Pro Rata Share upon the
       occurrence of any of the following (each, a "Transaction"): (i) the sale,
       transfer or other disposition of any of Borrower's material assets (not
       including product inventory for sale to customers in the ordinary course
       of business), (ii) the acquisition of voting control in excess of 50% of
       Borrower by persons (other than the Investors), or (iii) the merger or
       consolidation of Borrower with or into another entity whereby the holders
       of Borrower's voting securities prior to such merger or consolidation
       hold less than 50% of the voting securities of the surviving entity.
       Notice of any such Transaction shall be provided to the Investors
       fourteen (14) calendar days prior to the consummation of any such
       Transaction and, notwithstanding anything to the contrary contained
       elsewhere in this Note, Investors may exercise their rights of conversion
       during such 14-day period."

       5. The Note is hereby amended by adding in the following new provision as
new Subsection C.5(e):

       "Notwithstanding anything herein to the contrary, this Note shall not be
       convertible into shares of Common Stock as contemplated herein, until
       such time as the Borrower has obtained shareholder approval of (i) an
       amendment to the Company's Articles of Incorporation to authorize a
       sufficient number of additional shares of Common Stock for potential
       issuance upon conversion of this Note, and (ii) this Amendment. Borrower
       hereby covenants that it will hold a meeting of its shareholders, or
       otherwise seek written consents of its shareholders, as soon as
       practicable after the date of this Amendment in order to seek such
       shareholder approval. The Investors further acknowledge that: (i)
       Borrower will authorize, in its Articles of Incorporation, a total of 150
       million shares of Common Stock, of which 125 million will be reserved for
       issuance upon: (x) conversion of this Note, (y) conversion of the
       convertible promissory notes dated February 22, 2000, April 14, 2000,
       September 7, 2000, December 29, 2000, and November 29, 2001, and (z)
       exercise of warrants issued pursuant to Section G.1 of the convertible
       promissory note dated November 29, 2001; and that (ii) the Investors
       cannot effect any such conversion or exercise as described in the
       foregoing clause (i) that exceeds 125 million shares unless and until the
       shareholders approve an amendment to the Articles of Incorporation
       increasing the number of authorized shares to an amount that permits such
       exercise or conversion."

                                      -2-
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       6. Subsection H.6 of the Note is hereby amended by replacing it in its
entirety by the following new provision:

       "AMENDMENT PROVISIONS. This Note may be amended by the addition or
       deletion of any provisions thereof and any rights of a Lender may be
       modified in any manner in writing by the Borrower and Lenders holding
       notes representing a majority of the principal amount under notes issued
       by the Borrower on February 22, 2000, April 14, 2000, September 7, 2000,
       December 29, 2000 and March 15, 2001; provided, however, that no such
       amendment shall, without the consent of each Lender to be affected
       thereby: (i) extend the Scheduled Payment date set forth in Subsection
       C.1, (ii) reduce the principal amount of the Note, (iii) decrease any
       interest rate payable under the Note, (iv) change the currency in which
       the Note is payable, (v) impair any rights of a holder against the
       Borrower upon any Event of Default, (vi) modify any of the conversion
       features of the Notes or increase the amounts set forth in Subsection
       C.5(a)(ii), or (vii) impair any Lenders' lien on the Borrower's assets."

       7. A new Subsection H.12 is hereby added to the Note that states in its
entirety as follows:

       "Intercreditor Agreement. This Note is subject to the terms and
       conditions of an Intercreditor Agreement, dated as of November 29, 2001
       (the "Intercreditor Agreement"), among Borrower, the Investors and
       certain other holders of Secured Promissory Notes issued by Borrower. In
       the event of any conflict between the provisions of Section 1 of the
       Intercreditor Agreement and any provision of this Note, the provision of
       such Section 1 shall govern and control."

                               ARTICLE II: GENERAL

       1. Governing Law; Venue. This Amendment shall be governed by the laws of
the State of California, without giving effect to conflicts of law principles.
Borrower and Lender agree that all actions or proceedings arising in connection
with this Amendment shall be tried and litigated only in the state and federal
courts located in the City and County of Santa Clara, State of California or, at
Lender's option, any court in which Lender determines it is necessary or
appropriate to initiate legal or equitable proceedings in order to exercise,
preserve, protect or defend any of its rights and remedies under this Amendment
or otherwise or to exercise, preserve, protect or defend its Lien, and the
priority thereof, against the Collateral, and which has subject matter
jurisdiction over the matter in controversy.

       2. Entire Agreement; Counterparts. This Amendment and the Note together
embody the entire understanding and agreement between Borrower and the Investors
and supersede all prior agreements and understandings relating to the subject
matter hereof. This Amendment may be executed in any number of counterparts,
each of which shall be enforceable against the parties actually executing such
counterparts, and all of which together shall constitute one instrument.

       3. Security Interest. Borrower acknowledges that it has granted to the
Investors a security interest in the Collateral to secure the payment of all of
the Secured Obligations including,

                                      -3-
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without limitation, principal, accrued interest, other advances made under the
Note and any attorneys' fees to which the Investors are entitled under the Note.
Borrower acknowledges that it has taken prior to the date hereof all actions
required and reasonably necessary to perfect and to otherwise give notice of the
security interest granted hereunder including, but not limited to, the execution
and filing of financing statements and the filing of notices of security
interests with the United States Patent and Trademark Office.

       4. Restrictions on Transfer and Compliance with Securities Act; Investor
Representations and Warranties.

              (a) Certificates representing any of the shares of Common Stock
acquired pursuant to the provisions of this Note shall have endorsed thereon the
following legends, as appropriate.

                     (i) Such shares of Common Stock will not be registered
under the Securities Act of 1933, as amended (the "Securities Act"), nor
qualified (if necessary) under applicable state securities laws and consequently
will have the following legend:

       "THE SECURITIES EVIDENCED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
       UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD,
       TRANSFERRED, ASSIGNED OR HYPOTHECATED UNLESS THERE IS AN EFFECTIVE
       REGISTRATION STATEMENT UNDER SUCH ACT COVERING SUCH SECURITIES, THE SALE
       IS MADE IN ACCORDANCE WITH RULE 144 UNDER THE ACT, OR THE COMPANY
       RECEIVES AN OPINION OF COUNSEL FOR THE HOLDER OF THESE SECURITIES
       REASONABLY SATISFACTORY TO THE COMPANY, STATING THAT SUCH SALE, TRANSFER,
       ASSIGNMENT OR HYPOTHECATION IS EXEMPT FROM THE REGISTRATION AND
       PROSPECTUS DELIVERY REQUIREMENTS OF SUCH ACT."

                     (ii) Any legend required to be placed thereon by any
applicable state securities laws.

              (b) Each Investor, by acceptance hereof or by making any Advances,
agrees that the Note, as amended by this Amendment, and the shares of Common
Stock to be issued upon conversion pursuant to the terms of the Note, as amended
by this Amendment, are being acquired solely for his own account and not as a
nominee for any other party and not with a view toward the resale or
distribution thereof and that he will not offer, sell or otherwise dispose of
the Note, as amended by this Amendment, or any shares of Common Stock to be
issued upon conversion pursuant to the terms hereof except under circumstances
which will not result in a violation of the Securities Act or of applicable
state securities laws.

              (c) Each Investor, by acceptance hereof, represents that such
Investor is (i) an accredited investor within the meaning of Rule 501 under the
Securities Act and has such knowledge and experience in financial and business
matters that he is capable of evaluating the merits and risks

                                      -4-
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of the purchase of the Note, as amended by this Amendment, and can bear the
economic risk of his investment; (ii) aware of the Borrower's business affairs
and financial condition; and (iii) aware that the Note, as amended by this
Amendment, has not been registered under the Securities Act in reliance upon a
specific exemption therefrom.

              (d) Subject to the preceding, the Note, as amended by this
Amendment, may be transferred only upon surrender of the original Note as
amended by this Amendment, for registration of transfer, duly endorsed, or
accompanied by a duly executed written instrument of transfer in form
satisfactory to Borrower. Thereupon, a new note for like principal amount and
interest will be issued to, and registered in the name of, the transferee.
Interest and principal are payable only to the Investors or their transferees
set forth on Exhibit A to the Note.

                [remainder of the page intentionally left blank]

                                      -5-
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       IN WITNESS WHEREOF, the Borrower and each of the Investors has caused
this Note to be duly executed on the date first written above.

                                        EUPHONIX, INC.

                                        By: /s/ Jeffrey Chew
                                            ------------------------------------
                                        Name: Jeffrey Chew
                                        Title: Chief Executive Officer

                                        INVESTORS

                                        /s/ Dieter Meier
                                        ----------------------------------------
                                        Dieter Meier

                                        /s/ Walter Bosch
                                        ----------------------------------------
                                        Walter Bosch

[SIGNATURE PAGE TO AMENDMENT TO SECURED PROMISSORY NOTE DATED MARCH 15, 2001]Exhibit 10.3
                                                                    ------------

                                                                  EXECUTION COPY

                        INVESTORS STOCKHOLDERS' AGREEMENT

                                  by and among

                               TELECORP PCS, INC.

                                       and

                          THE STOCKHOLDERS NAMED HEREIN

                          dated as of February 28, 2000

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                               TABLE OF CONTENTS

                                                                            Page

1.  Certain Definitions........................................................2

2.  Management of Company; Certain Voting Requirements.........................2
    2.1.  Board of Directors...................................................2
    2.2.  Removal; Filling of Vacancies........................................3
    2.3.  Election of Initial Board of Directors...............................4
    2.4.  Reduction of Unfunded Commitment.....................................4

3.  Unfunded Commitment; Additional Capital Contributions......................4

4.  After-Acquired Shares; Recapitalization....................................5
    4.1.  After-Acquired Shares; Recapitalization..............................5

5.  Equitable Relief...........................................................5
    5.1.  Equitable Relief.....................................................5

6.  Miscellaneous..............................................................6
    6.1.  Notices..............................................................6
    6.2.  Entire Agreement; Amendment; Consents................................6
    6.3.  Term.................................................................6
    6.4.  Obligations Several..................................................6
    6.5.  Governing Law........................................................6
    6.6.  Jurisdiction.........................................................7
    6.7.  Benefit and Binding Effect; Severability.............................7
    6.8.  Headings.............................................................7
    6.9.  Counterparts.........................................................7

Schedules
---------
Schedule I     Cash Equity Investors
Schedule II    Stock Ownership
Schedule III   Initial Director Nominees
Schedule IV    Notices

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                       INVESTORS STOCKHOLDERS' AGREEMENT

         THIS INVESTORS STOCKHOLDERS' AGREEMENT, dated as of February 28, 2000
(this "Agreement"), is by and among AT&T WIRELESS PCS, INC., a Delaware
corporation, CB CAPITAL INVESTORS, L.P., a Delaware corporation, together with
its Affiliated Successors ("Chase"), PRIVATE EQUITY INVESTORS III, L.P. ("PEI
III"), a Delaware limited partnership, EQUITY-LINKED INVESTORS-II, a New York
limited partnership ("ELI II", and together with PEI III, "Desai"), WHITNEY
EQUITY PARTNERS, L.P. ("WEP"), a Delaware limited partnership, J. H. WHITNEY
III, L.P. ("JHW"), a Delaware limited partnership, WHITNEY STRATEGIC PARTNERS
III, L.P., a Delaware limited partnership ("WSP", and together with JHW and WEP,
"Whitney"), MEDIA/COMMUNICATIONS INVESTORS LIMITED PARTNERSHIP ("MC"), a
Massachusetts limited partnership, MEDIA/COMMUNICATIONS PARTNERS III LIMITED
PARTNERSHIP, a Delaware limited partnership ("MC-III", and, together with MC,
"MC Partners"), TORONTO DOMINION INVESTMENTS, INC. ("TDI"), a Delaware
corporation, NORTHWOOD VENTURES LLC, a New York limited liability company,
("NV"), NORTHWOOD CAPITAL PARTNERS LLC, a New York limited liability company
("NCP", and, together with NV, "Northwood"), ONELIBERTY FUND III, L.P., a
Delaware limited partnership ("OneLiberty"), HOAK COMMUNICATIONS PARTNERS, L.P.
("HCP"), a Delaware limited partnership, HCP CAPITAL FUND, L.P., a Delaware
limited partnership ("HCP Fund", and, together with HCP, "Hoak"), CIHC,
INCORPORATED, a Delaware corporation, ("Conseco"), DRESDNER KLEINWORT BENSON
PRIVATE EQUITY PARTNERS LP, a Delaware limited partnership ("Dresdner"), TORONTO
DOMINION INVESTMENTS, INC., a Delaware corporation ("TD"), GENERAL ELECTRIC
CAPITAL CORPORATION, a New York corporation ("GE Capital"), TRIUNE PCS, LLC, a
Delaware limited liability company ("Triune"), FCA VENTURE PARTNERS II, L.P., a
Delaware limited partnership ("FCA"), CLAYTON ASSOCIATES LLC, a Tennessee
limited liability company ("Clayton"), TRILLIUM PCS, LLC., a Mississippi limited
liability company ("Trillium"), AIRWAVE COMMUNICATIONS, LLC, a Mississippi
limited liability company ("Airwave"), DIGITAL PCS, LLC, a Mississippi limited
liability company ("Digital"), THE MANUFACTURERS LIFE INSURANCE COMPANY
(U.S.A.), a Michigan corporation ("MF"), and the investors listed on Schedule I
(individually, each a "Cash Equity Investor" and, collectively with Chase,
Desai, Whitney, MC Partners, TDI, Northwood, OneLiberty, Hoak, Mercury, THC and
any of their respective Affiliated Successors who become a Stockholder and a
party to this Agreement in accordance with the terms hereof, the "Cash Equity
Investors"). Each of the foregoing Persons are sometimes referred to herein,
individually, as a "Stockholder" and, collectively, as the "Stockholders."

                                    RECITALS

         WHEREAS, on the date hereof, Tritel, Inc. ("Tritel") and TeleCorp PCS,
Inc. ("Telecorp") entered into that certain Agreement and Plan of Reorganization
and Contribution, copies of which have been provided to the parties hereto (the
"Merger Agreement") providing

<PAGE>

for the merger of Telecorp Merger Sub, a to-be-formed wholly-owned subsidiary of
Telecorp PCS, Inc., a to-be-formed Delaware corporation (the "Company"), with
and into Telecorp, and the merger of Tritel Merger Sub, a to-be-formed
wholly-owned subsidiary of the Company, with and into Tritel (collectively, the
"Merger"), whereby Telecorp and Tritel will be the surviving corporations of the
Merger and will become wholly-owned subsidiaries of the Company upon the
effectiveness of the Merger (such date, the "Effective Date");

         WHEREAS, the Cash Equity Investors, the Company and the other
Stockholders named therein have agreed to become parties to that certain
Stockholders Agreement, to be dated the Effective Date (as amended from time to
time, in accordance with its terms, the "Company Stockholder Agreement")
pursuant to which the Cash Equity Investors and the other parties thereto have
agreed to provide for the management of the Company and to impose certain
restrictions with respect to the sale, transfer or other disposition of Company
Stock on the terms set forth therein; and

         WHEREAS, each Stockholder, without giving effect to the transfer of any
shares of capital stock of Telecorp or Tritel owned or controlled by such
Stockholder on or after the date hereof but prior to the Effective Date, shall,
on the Effective Date, be registered owner of the respective shares of Common
Stock of the Company, (excluding Class C Common Stock and Voting Preference
Stock) (the "Common Stock") and Series C Preferred Stock set forth opposite its
name on Schedule II; and

         WHEREAS, the parties hereto desire to enter into this Agreement in
order to impose certain further restrictions with respect to the sale, transfer
or other disposition of Company Stock and to provide for certain rights with
respect to the management of the Company on the terms and conditions hereinafter
set forth, such obligations to become effective on the Effective Date;

         NOW, THEREFORE, in consideration of the premises and the mutual
representations, warranties, covenants, conditions and agreements hereinafter
set forth, the parties agree as follows:

1.   Certain Definitions.

         Capitalized terms not otherwise defined herein shall have the meanings
set forth in the Company Stockholder Agreement.

         Each definition or pronoun herein shall be deemed to refer to the
singular, plural, masculine, feminine or neuter as the context requires. Words
such as "herein," "hereinafter," "hereof," "hereto" and "hereunder" refer to
this Agreement as a whole, unless the context otherwise requires.

2.   Management of Company; Certain Voting Requirements.

<PAGE>

         (a) Board of Directors. Each of the Cash Equity Investors hereby
agrees, so long as such Stockholder continues to hold any shares of Series C
Preferred Stock or Common Stock, in exercising its rights under Section 3 of the
Company Stockholder Agreement, that it will vote or cause to be voted all of the
shares of its Common Stock owned or held of record by it (whether now owned or
hereafter acquired), in person or by proxy, to cause the selection of directors,
the election of directors and thereafter the continuation in office of the
following persons as members of the Board of Directors (the "Cash Equity
Directors") as follows:

          (i) one (1) individual to be designated by Chase (or its Affiliated
     Successors) and shall initially be Michael Hannon (the "Chase Designee");

          (ii) one (1) individual to be designated by Desai (or its Affiliated
     Successors) and shall initially be Rohit Desai (the "Desai Designee");

          (iii) one (1) individual to be designated by Dresdner (or its
     Affiliated Successors) and shall initially be Alex Coleman (the "Dresdner
     Designee");

          (iv) one (1) individual to be designated by Triune (or its Affiliated
     Successors) and shall initially be Kevin Shepherd (the "Triune Designee");

          (v) with respect to any individual selected pursuant to Section 3.1(e)
     of the Company Stockholder Agreement, such individual shall be deemed
     acceptable to holders of a "Majority in Interest of the Class A Common
     Stock Beneficially Owned by the Cash Equity Investors" in accordance with
     such Section 3.1(e) only in the event such individual has been approved by
     "Two-Thirds in Interest of the Cash Equity Investors" (as defined below).

          (vi) the right to designate any designee pursuant to this Section 2.1
     shall terminate in accordance with Section 12.3(c) of the Company
     Stockholder Agreement; provided, that if the number of Cash Equity
     Directors is required to be reduced pursuant to Section 12.3(c) of the
     Company Stockholder Agreement, the designee pursuant to this Section 2.1(a)
     who represents the Stockholder holding the fewest shares of Common Stock of
     all such shares owned on the date of such mandated reduction by
     Stockholders whose designees then remain as Cash Equity Directors shall
     resign (or the other directors or Stockholders shall remove them) from the
     Board of Directors.

         (b) For purposes of this Agreement, "Two-Thirds in Interest of the Cash
Equity Investors" shall mean the Cash Equity Investors owning two-thirds of the
outstanding shares of Common Stock held by all Cash Equity Investors.

         (c) Any nomination or designation of directors and the acceptance
thereof pursuant to this Section 2.1 shall be evidenced in writing.

<PAGE>

         2.2. Removal; Filling of Vacancies. Except as set forth in Section 2.1,
each Cash Equity Investor agrees it will not vote any shares of Common Stock
owned or controlled by such Cash Equity Investor, for the removal without cause
of any director designated by any other Cash Equity Investor in accordance with
Section 2.1. Any successor director to the director designated by Chase, Desai,
Dresdner or Triune (each a "Designating CEI") shall be designated by the
applicable Designating CEI; provided, however, that, in the event such successor
director is not an employee of the applicable Designating CEI, such successor
must also be approved by Two-Thirds in Interest of the Cash Equity Investors.

         2.3. Election of Initial Board of Directors. Each Cash Equity Investor
hereby consents to the nomination of the persons designated on Schedule III
hereto to be the initial Cash Equity Directors of the Company pursuant to the
Company Stockholder Agreement.

         2.4. Reduction of Unfunded Commitment. In connection with a public
offering of the Company's Common Stock, any Cash Equity Investor may request
that the Company reduce the Unfunded Commitment of such Cash Equity Investor
upon the divestiture to the Company by such Cash Equity Investor (including by
transferring to the Company shares of Common Stock which may be sold by the
Company, including by the Company's sale of such shares in a registered offering
in lieu of such Cash Equity Investor's otherwise allocable pro rata share of
such registered offering) a number of shares of Company Stock having a value
(based upon the gross proceeds per share of Common Stock to be received by the
Company in such offering) equal to the amount by which the then present value of
the Unfunded Commitment (determined by using the Applicable Federal Rate as the
relevant discount rate) is to be reduced.

          (a) Unfunded Commitment; Additional Capital Contributions. In the
     event any Cash Equity Investor (a "Defaulting Cash Equity Investor") fails
     to satisfy any portion of its Unfunded Commitment pursuant to Section 2.2
     of the Telecorp Securities Purchase Agreement (a "Payment Default"), the
     Company shall give prompt written notice, but no later than one (1)
     business day following such default (a "Default Notice"), to each Cash
     Equity Investor other than the Defaulting Cash Equity Investor (each a
     "Non-Defaulting Cash Equity Investor") of the amount of such Payment
     Default (the "Default Amount"). In the event the Defaulting Cash Equity
     Investor has failed to cure such Payment Default or in the event that no
     Affiliated Cash Equity Investor (defined below) of such Defaulting Cash
     Equity Investor has cured such Payment Default, within five (5) days of the
     Payment Default, each Non-Defaulting Cash Equity Investor may, acting on
     its own or in conjunction with one or more of the other Non-Defaulting Cash
     Equity Investors (each a "Participating Cash Equity Investor"), agree to
     fund all or any portion of such Payment Default by providing written notice
     to the Company (a "Payment Notice") no later than 12:00 Noon (New York
     time) twenty (20) days following the date on which the Default Notice is
     delivered (the "Payment Notice Period") and the Company shall thereafter
     provide each Participating Cash Equity Investor with copies of such Payment
     Notice or Payment Notices; provided, however, that if the aggregate amount
     agreed to be funded by the Participating Cash Equity Investors shall exceed
     the Payment Default, then the amount to be funded by each such
     Participating Cash Equity Investor shall be divided amongst the
     Participating Cash Equity Investors pro rata in accordance with the shares
     of Common Stock owned or controlled by such Participating Cash Equity
     Investors; provided, further, however, that if the aggregate amount agreed
     to be funded by the Participating Cash Equity Investors shall

<PAGE>

     be less than the Payment Default (a "Payment Default Shortfall"), the
     Company shall give prompt written notice, but no later than one (1)
     business day following the end of the Payment Notice Period, of such
     Payment Default Shortfall (a "Payment Default Shortfall Notice") to all
     Non-Defaulting Cash Equity Investors and all such Non-Defaulting Cash
     Equity Investors may agree to fund the Payment Default Shortfall by
     providing written notice to the Company within five (5) days of delivery of
     the Payment Notice and payment shall be made in accordance with the
     preceding two provisos.

          (b) Upon payment of the Default Amount (or any portion thereof), each
     Participating Cash Equity Investor (i) shall be deemed to be the record and
     beneficial owner of that number of shares of Common Stock owned or
     controlled by the Defaulting Cash Equity Investor equal to (w) the total
     number of shares of Common Stock owned or controlled by the Defaulting Cash
     Equity Investor multiplied by (x) the amount paid by such Participating
     Cash Equity Investor pursuant to this Section 4 divided by the Default
     Amount, and (ii) shall become obligated to the Company pursuant to Section
     2.2 of the Securities Purchase Agreement with respect to the remaining
     Unfunded Commitment, if any, of the Defaulting Cash Equity Investor in an
     amount equal to (y) the amount of such remaining Unfunded Commitment
     multiplied by (z) the percentage of the Unfunded Commitment the Defaulting
     Cash Equity Investor failed to satisfy which such Participating Cash Equity
     Investor funded pursuant to this Section 4.

          (c) For purposes of this Section 3, an "Affiliated Cash Equity
     Investor" shall mean an Affiliated Successor of such Cash Equity Investor
     and (i) with respect to Desai, PEI III and ELI II and any of their
     respective Affiliated Successors, (ii) with respect to Whitney, WEP, JHW
     and WSP and any of their respective Affiliated Successors, (iii) with
     respect to MC Partners, MC and MC-III and any of their respective
     Affiliated Successors, (iv) with respect to Northwood, NV and NCP and any
     of their respective Affiliated Successors, (v) with respect to Hoak, HCP
     and HCP Fund and any of their respective Affiliated Successors.

3.   After-Acquired Shares; Recapitalization.

         (a) After-Acquired Shares; Recapitalization. All of the provisions of
this Agreement shall apply to all of the shares of Equity Securities now owned
or hereafter issued or transferred to a Stockholder in consequence of any
additional exchange or reclassification of shares of Equity Securities,
corporate reorganization, or any other form of recapitalization, or
consolidation, or merger, or share split, or share dividend, or which are
acquired by a Stockholder or its Affiliate in any other manner.

         (b) Whenever the number of outstanding shares of Equity Securities is
changed by reason of a stock dividend or a subdivision or combination of shares
effected by a reclassification of shares, each specified number of shares
referred to in this Agreement shall be adjusted accordingly.

4.   Equitable Relief.

<PAGE>

         4.1. Equitable Relief. The parties hereto agree and declare that legal
remedies may be inadequate to enforce the provisions of this Agreement and that,
in addition to being entitled to exercise all of the rights provided herein or
in the Company's Certificate of Incorporation or granted by law, including
recovery of damages, equitable relief, including specific performance and
injunctive relief, may be used to enforce the provisions of this Agreement.

5.   Miscellaneous.

         5.1. Notices. All notices or other communications hereunder shall be in
writing and shall be given in the manner prescribed in the Company Stockholder
Agreement.

          (a) Entire Agreement; Amendment; Consents. This Agreement and the
     Company Stockholder Agreement constitute the entire agreement among the
     parties with respect to the subject matter hereof and supersedes all other
     prior agreements and understandings, both written and oral, among the
     parties or any of them with respect to the subject matter hereof. The
     Stockholders agree that the terms of this Agreement shall supersede any
     inconsistent provision contained in the Company Stockholder Agreement.

          (b) No  change  or  modification  of this  Agreement  shall be  valid,
     binding or  enforceable  unless the same shall be in writing  and signed by
     Stockholders  who own or control  at least  66-2/3% of all shares of Common
     Stock owned or controlled by the Cash Equity Investors;  provided, however,
     that no change or modification  to this Agreement  which adversely  effects
     the rights of any  Stockholder  or the Company shall be valid,  binding and
     enforceable  unless  the  same  shall  be in  writing  and  signed  by such
     Stockholder  or the  Company.  In the event any party hereto shall cease to
     own any shares of Equity  Securities  such party hereto shall cease to be a
     party to this  Agreement  and the  rights  and  obligations  of such  party
     hereunder shall terminate.

          (c) Whenever in this Agreement the consent or approval of a
     Stockholder is required, except as expressly provided herein, such consent
     or approval may be given or withheld in the sole and absolute discretion of
     each Stockholder.

          (d) Whenever the Company Stockholder Agreement is amended in
     accordance with its terms, the Stockholders hereto agree to enter into such
     amendments to this Agreement necessary to effectuate the intent of this
     Agreement. The Stockholder shall not enter into any such amendment the
     effect of which adversely effects the rights of any Stockholder hereto
     without the consent of such Stockholder.

         5.2. Term. This Agreement shall terminate upon the termination of the
Company Stockholder Agreement.

         5.3. Obligations Several. The obligations of each Stockholder under
this Agreement shall be several with respect to each such Stockholder.

         5.4. Governing Law. This Agreement shall be governed and construed in
accordance with the law of the State of Delaware.

          (a) Jurisdiction. The Company and each of the Stockholders hereby
     irrevocably consents to the exclusive jurisdiction of the state or federal
     courts in the State of New York, and all state or federal courts competent
     to hear appeals therefrom, over any actions which may be commenced against
     any of them under or in connection with this Agreement. The Company and

<PAGE>

     each Stockholder hereby irrevocably waive, to the fullest extent permitted
     by applicable law, any objection which any of them may now or hereafter
     have to the laying of venue of any such dispute brought in such court or
     any defense of inconvenient forum for the maintenance of such dispute in
     the Southern District of New York and New York County. The Company and each
     Stockholder hereby agree that a judgment in any such dispute may be
     enforced in other jurisdictions by suit on the judgment or in any other
     manner provided by law. The Company and each Stockholder hereby consent to
     process being served by any party to this Agreement in any actions by the
     transmittal of a copy thereof in accordance with the provisions of Section
     8.1 of the Company Stockholder Agreement.

         5.5. Benefit and Binding Effect; Severability. This Agreement shall be
binding upon and shall inure to the benefit of the Company (solely with respect
to Sections 3.2, 3.3 and 4), its successors and assigns, and each of the
Stockholders and their respective executors, administrators and personal
representatives and heirs and permitted assigns. If any term or other provision
of this Agreement is invalid, illegal or incapable of being enforced by any law
or public policy or any listing requirement applicable to the Common Stock, all
other terms and provisions of this Agreement shall nevertheless remain in full
force and effect. Upon such determination that any term or other provision is
invalid, illegal or incapable of being enforced, the parties hereto affected by
such determination in any material respect shall negotiate in good faith to
modify this Agreement so as to effect the original intent of the parties as
closely as possible in an acceptable manner in order that the provisions hereof
are given effect as originally contemplated to the greatest extent possible.

         5.6. Headings. The captions in this Agreement are for convenience only
and shall not be considered a part of or affect the construction or
interpretation of any provision of this Agreement.

         5.7. Counterparts. This Agreement may be executed in two or more
counterparts, each of which shall be deemed to be an original, but all of which
together shall constitute one and the same instrument.

<PAGE>

         IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written:

                                        TELECORP PCS, INC.

Executed on behalf of TeleCorp PCS,     By:  /s/ Thomas H. Sullivan
Inc. as of November 13, 2000               --------------------------------
                                        Name:  Thomas H. Sullivan
                                        Title: Executive Vice President -
                                               Chief Financial Officer

<PAGE>

                                        Telecorp Cash Equity Investors:

                                        CB CAPITAL INVESTORS, L.P.

                                        By:  CB Capital Investors, Inc.
                                             its general partner

                                        By: /s/ Michael R. Harmon
                                           --------------------------------
                                        Name:  Michael R. Harmon
                                        Title: Vice President CB Capital
                                               Investors, L.P.

                                        NORTHWOOD VENTURES LLC

                                        By: /s/ Henry T. Wilson
                                           --------------------------------
                                        Name:  Henry T. Wilson
                                        Title: Managing Director

<PAGE>

                                        NORTHWOOD CAPITAL PARTNERS LLC

                                        By: /s/ Henry T. Wilson
                                           --------------------------------
                                        Name:  Henry T. Wilson
                                        Title: Managing Director

                                        ONE LIBERTY FUND IV, L.P.

                                        By: /s/ Edwin M. Kania, Jr.
                                           --------------------------------
                                        Name:  Edwin M. Kania, Jr.
                                        Title: General Partner of
                                               One Liberty Partners IV, LLC,
                                               general partner for
                                               One Liberty Fund IV, L.P.

                                        ONE LIBERTY FUND III, L.P.

                                        By: /s/ Edwin M. Kania, Jr.
                                           --------------------------------
                                        Name:  Edwin M. Kania, Jr.
                                        Title: General Partner of
                                               One Liberty Partners III, L.P.,
                                               general partner for
                                               One Liberty Fund III, L.P.

                                        MEDIA COMMUNICATIONS
                                        INVESTORS LIMITED PARTNERSHIP

                                        By:  M/C Investors General
                                             Partner - J. Inc.,
                                             a general partner

                                        By: /s/ James F. Wade
                                           --------------------------------
                                        Name:  James F. Wade
                                        Title: Authorized Officer

                                        MEDIA/COMMUNICATIONS PARTNERS III
                                        LIMITED PARTNERSHIP

                                        By:  M/CP III General Partner -
                                             J. Inc., a general partner

                                        By: /s/ James F. Wade
                                           --------------------------------
                                        Name:  James F. Wade
                                        Title: Authorized Officer

<PAGE>

                                        EQUITY-LINKED INVESTORS - II

                                        By: ROHIT M. DESAI ASSOCIATES-II,
                                            its general partner

                                        By: /s/ Rohit M. Desai
                                           --------------------------------
                                        Name:
                                             ------------------------------
                                        Title:
                                              -----------------------------

                                        PRIVATE EQUITY INVESTORS III, L.P.

                                        By:  ROHIT M. DESAI ASSOCIATES III,

                                        By: /s/ Rohit M. Desai
                                           --------------------------------
                                        Name:
                                             ------------------------------
                                        Title:
                                              -----------------------------

                                        HOAK COMMUNICATIONS PARTNERS, L.P.

                                        By: HCP Investments, L.P., its
                                            general partner

                                        By: Hoak Partners, LLC, its general
                                            partner

                                        By: /s/ James M. Hoak
                                           --------------------------------
                                        Name:  James M. Hoak
                                        Title: Manager

                                        HCP CAPITAL FUND, L.P.

                                        By: James M. Hoak & Co.,
                                            its general partner

                                        By: /s/ James M. Hoak
                                           --------------------------------
                                        Name:  James M. Hoak
                                        Title: Chairman

                                        ONE LIBERTY ADVISORS FUND IV, L.P.
                                        By: its general partner

                                        ONE LIBERTY PARTNERS IV, LLC
                                        By: its managing member

                                        By: /s/ Edwin M. Kania, Jr.
                                           --------------------------------
                                           Edwin M. Kania, Jr.

<PAGE>

                                        WHITNEY EQUITY PARTNERS, L.P.

                                        By: J.H. Whitney & Co., its
                                            general partner

                                        By: /s/ William Laverack, Jr.
                                           -------------------------------
                                        Name:
                                        Title:

                                        J.H. WHITNEY III, L.P.

                                        By: J.H. Whitney & Co.,
                                            its general partner

                                        By: /s/ William Laverack, Jr.
                                           --------------------------------
                                        Name:
                                        Title:

                                        WHITNEY STRATEGIC PARTNERS III,
                                        L.P.

                                        By: J.H. Whitney & Co.
                                            Its general partner

                                        By: /s/ William Laverack, Jr.
                                           --------------------------------
                                        Name:
                                        Title:

<PAGE>

                                        TORONTO DOMINION INVESTMENTS INC.

                                        By: /s/ Martha L. Gariepy
                                           --------------------------------
                                        Name:  Martha L. Gariepy
                                        Title: Vice President

                                        GILDE INTERNATIONAL B.V.,
                                        by its attorney in fact Morgan,
                                        Holland Partners L.P., by its GP
                                        Morgan, Holland Partners II, L.P.

                                        By: /s/ Edwin M. Kania, Jr.
                                           --------------------------------
                                        Name:  Edwin M. Kania, Jr.
                                        Title: General Partner

                                        AT&T WIRELESS 2000

                                        By:
                                           --------------------------------
                                        Name:
                                        Title:

                                        DIGITAL PCS, LLC

                                        By:
                                           --------------------------------
                                        Name:
                                             ------------------------------
                                        Title:
                                              -----------------------------

<PAGE>

                                        TRITEL CASH EQUITY INVESTORS:

                                        TORONTO DOMINION INVESTMENTS, INC.

                                        By: /s/ Martha L. Gariepy
                                           --------------------------------
                                        Name: Martha L. Gariepy
                                        Title: Vice President

                                        GENERAL ELECTRIC CAPITAL
                                        CORPORATION

                                        By:
                                           --------------------------------
                                        Name:
                                             ------------------------------
                                        Title:
                                              -----------------------------

                                        CIHC, INCORPORATED

                                        By: /s/ William T. Devanney, Jr.
                                           --------------------------------
                                        Name: William T. Devanney, Jr.
                                        Title: Sr. Vice President

                                        DRESDNER KLEINWORT BENSON
                                        PRIVATE EQUITY PARTNERS LP

                                        By: Dresdner Kleinwort Benson
                                            Private Equity Managers LLC,
                                            as its general partner

                                        By: /s/ Alexander P. Coleman
                                           --------------------------------
                                        Name: Alexander P. Coleman
                                        Title: Authorized Signatory

<PAGE>

                                        TRIUNE PCS, LLC, A DELAWARE
                                        LIMITED LIABILITY COMPANY

                                        By:    Oak Tree, LLC
                                        Title: Manager

                                        By:    Triune Private Equity, LLC
                                        Title: Manager

                                        By: /s/ Kevin Shepherd
                                           --------------------------------
                                        Name:  Kevin Shepherd
                                        Title: Manager

                                        FCA VENTURE PARTNERS II, L.P.

                                        By: Clayton-DC Venture Capital
                                            Group, LLC, its general partner

                                        By:
                                           --------------------------------
                                        Name:  D. Robert Crants, III
                                        Title: Manager

                                        CLAYTON ASSOCIATES, LLC

                                        By:
                                           --------------------------------
                                           its managing member

                                        SOUTHERN FARM BUREAU LIFE
                                        INSURANCE COMPANY

                                        By:
                                           --------------------------------
                                        Name:
                                             ------------------------------
                                        Title:
                                              -----------------------------

<PAGE>

                                        TRILLIUM PCS, LLC

                                        By: /s/ William M. Mounger, II
                                           --------------------------------
                                        Name: William M. Mounger, II
                                        Title: Manager

                                        Management Stockholders:

                                        -----------------------------------
                                        William M. Mounger, II

                                        -----------------------------------
                                        E. B. Martin, Jr.

                                        -----------------------------------
                                        William S. Arnett

<PAGE>

                                        JG FUNDING, LLC

                                        By:    Chrysalis Ventures, LLC
                                        Title:  Manager

                                        By:  /s/ David A. Jones, Jr.
                                           --------------------------------
                                        Name:  David A. Jones, Jr.
                                        Title: Manager

<PAGE>

                                                                      SCHEDULE I

                              CASH EQUITY INVESTORS

CB Capital Investors
380 Madison Avenue, 12th Floor
New York, NY  10017
Attn:  Michael Hannon
Fax:  (212) 622-3101

Equity-Linked Investors-II
Private Equity Investors III, L.P.
540 Madison Avenue, 36th Floor
New York, NY  10022
Attn:  Rohit M. Desai
Fax:  (212) 752-7807

Hoak Communications Partners, L.P.
HCP Capital Fund, L.P.
One Galleria Tower
13355 Noel Road, Suite 1050
Dallas, Texas  75240
Attn:  James Hoak
Fax:  (972) 960-4899

Whitney Equity Partners, L.P.
J.H. Whitney III, L.P.
Whitney Strategic Partners III, L.P.
177 Broad Street, 15th Floor
Stamford, Connecticut  06901
Attn:  William Laverack, Jr.
Fax:  (203) 973-1422

Media/Communications Partners III Limited Partnership
Media/Communications Investors Limited Partnership
75 State Street, Suite 2500
Boston, MA  02109
Attn:  James F. Wade
Fax:  (617) 345-7201

<PAGE>

OneLiberty Fund III, L.P.
One Liberty Square
Boston, MA  02109
Attn:  Joseph T. McCullen
Fax:  (617) 423-1765

Toronto Dominion Investments, Inc.
31 West 52nd Street
New York, NY  10019-6101
Attn:  Brian Rich
Fax:  (212) 974-8429

(with a copy to)
Toronto Dominion Investments, Inc.
909 Fannin
Suite 1700
Houston, Texas  77010
Attn:  Martha Gariepy
Fax:  (713) 652-2647

Northwood Ventures LLC
Northwood Capital Partners LLC
485 Underhill Boulevard, Suite 205
Syosset, New York  11791-3419
Attn:  Peter Schiff
Fax:  (516) 364-0879

CIHC, Incorporated
11825 North Pennsylvania Street
Carmel, IN 46032-4911
Attention:  John J. Sabl
Facsimile:  317-817-6327

Trillium PCS, LLC
Airwave Communications, LLC
Digital PCS, LLC
1410 Livingston Lane
Jackson, MS 39213-8003
Attention: William M. Mounger, II
Facsimile: 601-362-2664

<PAGE>

Dresdner Kleinwort Benson Private Equity
  Managers LLC
75 Wall Street, 24th Floor
New York, NY 10005-2889
Attention: Alexander P. Coleman
Facsimile: 212-429-3139

Triune PCS, LLC
4770 Baseline Road, Suite 380
Boulder, CO 80303
Attention: Kevin Shepherd
Facsimile: 303-499-6255

Toronto Dominion Investments, Inc.
31 W. 52nd Street
New York, NY 10019
Attention: Steve Reinstadtler
Facsimile: 212-974-8429

With copy to:
Toronto Dominion Investments, Inc.
909 Fannin, Suite 1700
Houston, TX 77010
Attention: Martha Gariepy
Facsimile: 713-652-2647

GE Capital Services Structured Finance Group
120 Long Ridge Road, 3rd Floor
Stamford, CT 06927-4000
Attention: Mark De Cruccio
Facsimile: 203-357-6868

FCA Venture Partners II, LP
Clayton Associates, LLC
10 Burton Hills Blvd., Suite 120
Nashville, TN 37215
Attention: Joel Goldberg
Facsimile: 615-263-0234

<PAGE>

The Manufacturers' Life Insurance Company (U.S.A.)
73 Tremont Street, Suite 1300
Boston, MA 02108-3915
Attention: David Alpert
Facsimile: 617-854-4340

JG Funding, LLC
______________________
______________________
Attention: David A. Jones, Jr.
Facsimile: ___________________

<PAGE>

                                                                     SCHEDULE II

                                 STOCK OWNERSHIP

[See schedule attached]

<PAGE>

                                                                    SCHEDULE III

                          INITIAL CASH EQUITY DIRECTORS

1.   Michael Hannon

2.   Rohit Desai

3.   Alex Coleman

4.   Kevin Shepherd

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