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                                                                   EXHIBIT 10.18

                            STOCK PURCHASE AGREEMENT

                                     BETWEEN

                        TSI COMMUNICATION HOLDINGS, INC.

                                       AND

                         TSI COMMUNICATION HOLDINGS, LLC

                          DATED AS OF FEBRUARY 14, 2002

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                                TABLE OF CONTENTS

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<S>                                                                                     <C>
Section 1. Authorization and Closing.....................................................1
         1A.      AUTHORIZATION OF THE STOCK.............................................1
         1B.      PURCHASE AND SALE OF THE STOCK.........................................1
         1C.      THE INITIAL CLOSING....................................................1

Section 2. CONDITIONS OF THE PURCHASER'S OBLIGATION AT THE CLOSING.......................1
         2A.      REPRESENTATIONS AND WARRANTIES; COVENANTS..............................2
         2B.      CERTIFICATE OF INCORPORATION...........................................2
         2C.      BYLAWS.................................................................2
         2D.      ACQUISITION AGREEMENT..................................................2
         2E.      CLOSING DOCUMENTS......................................................2
         2F.      FEES AND EXPENSES......................................................2
         2G.      COMPLIANCE WITH APPLICABLE LAWS........................................2
         2H.      WAIVER.................................................................3

Section 3. COVENANTS.....................................................................3
         3A.      FINANCIAL STATEMENTS AND OTHER INFORMATION.............................3
         3B.      INSPECTION OF PROPERTY.................................................4
         3C.      RESTRICTIONS...........................................................5
         3D.      AMENDMENT OF OTHER AGREEMENTS..........................................6
         3E.      UNRELATED BUSINESS TAXABLE INCOME......................................6
         3F.      HART-SCOTT-RODINO COMPLIANCE...........................................6

Section 4. TRANSFER OF RESTRICTED SECURITIES.............................................6

Section 5. REPRESENTATIONS AND WARRANTIES OF THE COMPANY.................................7
         5A.      ORGANIZATION AND CORPORATE POWER.......................................7
         5B.      CAPITAL STOCK AND RELATED MATTERS......................................8
         5C.      SUBSIDIARIES; INVESTMENTS..............................................8
         5D.      AUTHORIZATION; NO BREACH...............................................8
         5E.      CONDUCT OF BUSINESS; LIABILITIES.......................................9
         5F.      LITIGATION, ETC........................................................9
         5G.      BROKERAGE..............................................................9
         5H.      GOVERNMENTAL CONSENT, ETC..............................................9
         5I.      DISCLOSURE.............................................................9
         5J.      CLOSING DATE..........................................................10

Section 6. DEFINITIONS..................................................................10

Section 7. MISCELLANEOUS................................................................12
         7A.      EXPENSES..............................................................12
         7B.      REMEDIES..............................................................12
         7C.      PURCHASER'S INVESTMENT REPRESENTATIONS................................12
         7D.      CONSENT TO AMENDMENTS.................................................13
         7E.      SURVIVAL OF REPRESENTATIONS AND WARRANTIES............................13
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         7F.      SUCCESSORS AND ASSIGNS................................................13
         7G.      GENERALLY ACCEPTED ACCOUNTING PRINCIPLES..............................13
         7H.      SEVERABILITY..........................................................14
         7I.      COUNTERPARTS..........................................................14
         7J.      ENTIRE AGREEMENT......................................................14
         7K.      DESCRIPTIVE HEADINGS; INTERPRETATION..................................14
         7L.      GOVERNING LAW.........................................................14
         7M.      NOTICES...............................................................14
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                                LIST OF EXHIBITS

Exhibit A......................Amended and Restated Certificate of Incorporation

Exhibit B.................................................................Bylaws

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                            STOCK PURCHASE AGREEMENT

          This STOCK PURCHASE AGREEMENT (this "AGREEMENT") is made as of
February 14, 2002, between TSI Telecommunication Holdings, Inc., a Delaware
corporation (the "COMPANY"), and TSI Telecommunication Holdings, LLC, a Delaware
limited liability company (the "PURCHASER"). Except as otherwise indicated
herein, capitalized terms used herein are defined in SECTION 6 hereof.

The parties hereto agree as follows:

          Section 1. Authorization and Closing.AUTHORIZATION OF THE STOCK. The
Company shall authorize the issuance and sale to the Purchaser of 300,000 shares
of its Class A Cumulative Redeemable Preferred Stock, par value $0.01 per share
(the "PREFERRED STOCK"), and 101,000,000 shares of its Common Stock, par value
$0.001 per share (the "COMMON STOCK"), each having the rights and preferences
set forth in EXHIBIT A attached hereto. The Preferred Stock and the Common Stock
are collectively referred to herein as the "STOCK".

          1B.    PURCHASE AND SALE OF THE STOCK.

          (i)    INITIAL CLOSING. At the Initial Closing (as defined in SECTION
     1C below), the Company shall sell to the Purchaser and, subject to the
     terms and conditions set forth herein, the Purchaser shall purchase from
     the Company, 99,000,000 shares of Class A Common Stock at a price of $0.13
     per share and 240,479.70 shares of Preferred Stock at a price of $1,000 per
     share.

          (ii)   SUBSEQUENT CLOSINGS. Upon the written request of the Board and
     with the prior written approval of the Majority Member, the Purchaser may
     purchase from time to time after the Initial Closing, additional shares of
     Common Stock and Preferred Stock (each such purchase, a "SUBSEQUENT
     CLOSING"). At each Subsequent Closing, the Purchaser shall have the right
     to purchase Common Stock and Preferred Stock in the same proportion as in
     the Initial Closing, and at the same price per share as at the Initial
     Closing (as adjusted for stock splits, stock dividends, or other
     recapitalization transaction).

          1C.    THE INITIAL CLOSING. The closing of the purchase and sale of
the Stock to be purchased pursuant to SECTION 1B(i) (the "INITIAL CLOSING")
shall take place at the offices of Kirkland & Ellis, Citigroup Center, 153 East
53rd Street, New York, New York 10022 at 10:00 a.m. on February 14, 2002, or at
such other place or on such other date as may be mutually agreeable to the
Company and the Purchaser. At the Closing, the Company shall deliver to the
Purchaser certificates evidencing the Stock to be purchased by the Purchaser,
registered in the Purchaser's name, upon payment of the purchase price thereof
by a cashier's or certified check, or by wire transfer of immediately available
funds to such account as designated by the Company.

          Section 2. CONDITIONS OF THE PURCHASER'S OBLIGATION AT THE CLOSING.
The obligation of the Purchaser to purchase and pay for the Stock to be
purchased by it at the Closing is subject to the satisfaction as of the Closing
of the following conditions:

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          2A.    REPRESENTATIONS AND WARRANTIES; COVENANTS. The representations
and warranties contained in SECTION 5 hereof shall be true and correct at and as
of the Closing as though then made, except to the extent of changes caused by
the transactions expressly contemplated herein, and the Company shall have
performed in all material respects all of the covenants required to be performed
by it hereunder prior to the Closing.

          2B.    CERTIFICATE OF INCORPORATION. The Company's amended and
restated certificate of incorporation (the "CERTIFICATE OF INCORPORATION") shall
include the provisions set forth in EXHIBIT A hereto, shall be in full force and
effect under the laws of Delaware as of the Closing and shall not have been
amended or modified.

          2C.    BYLAWS. The Company's bylaws shall include the provisions set
forth in EXHIBIT B hereto (the "BYLAWS"), shall be in full force and effect
under the laws of Delaware as of the Closing and shall not have been amended or
modified.

          2D.    ACQUISITION AGREEMENT. The Acquisition Agreement shall be in
form and substance satisfactory to Purchaser, shall be in full force and effect
as of the Closing and shall not have been amended or modified. The conditions in
Article VII of the Acquisition Agreement shall have been satisfied in full
(without reliance on any waiver by the Company), and the acquisition
contemplated by the Acquisition Agreement shall have been consummated
simultaneously with the Closing hereunder in accordance with the terms of the
Acquisition Agreement.

          2E.    CLOSING DOCUMENTS. The Company shall have delivered to the
Purchaser all of the following documents:

          (i)    an Officer's Certificate, dated the date of the Closing,
     stating that the conditions specified in SECTION 1 and SECTIONS 2A through
     2D, inclusive, have been fully satisfied;

          (ii)   certified copies of the resolutions duly adopted by the Board
     authorizing the execution, delivery and performance of this Agreement and
     each of the other agreements contemplated hereby, the issuance and sale of
     the Stock and the consummation of all other transactions contemplated by
     this Agreement; and

          (iii)  certified copies of the Certificate of Incorporation and the
     Bylaws, each as in effect at the Closing.

          2F.    FEES AND EXPENSES. The Company shall have reimbursed the
Purchaser for its out-of-pocket fees and expenses as provided in SECTION 7A
hereof.

          2G.    COMPLIANCE WITH APPLICABLE LAWS. The purchase of Stock by the
Purchaser hereunder shall not be prohibited by any applicable law or
governmental regulation, shall not subject the Purchaser to any penalty,
liability or, in Purchaser's sole judgment, other onerous conditions under or
pursuant to any applicable law or governmental regulation, and shall be
permitted by laws and regulations of the jurisdictions to which the Purchaser is
subject.

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          2H.    WAIVER. Any condition specified in this SECTION 2 may be waived
only if such waiver is set forth in a writing executed by the Purchaser.

          Section 3. COVENANTS.

          3A.    FINANCIAL STATEMENTS AND OTHER INFORMATION. The Company shall
deliver the following to the Purchaser and to the Majority Member (so long as
the Purchaser holds any Stock):

          (i)    as soon as available but in any event within 30 days after the
     end of each monthly accounting period in each fiscal year, unaudited
     consolidating and consolidated statements of income and cash flows of the
     Company and its Subsidiaries for such monthly period and for the period
     from the beginning of the fiscal year to the end of such month, and
     consolidating and consolidated balance sheets of the Company and its
     Subsidiaries as of the end of such monthly period, all prepared in
     accordance with generally accepted accounting principles, consistently
     applied, subject to the absence of footnote disclosures and to normal
     year-end adjustments;

          (ii)   accompanying the financial statements referred to in (i) above,
     an Officer's Certificate stating that neither the Company nor any of its
     Subsidiaries is in default under any of its material agreements or, if any
     such default exists, specifying the nature and period of existence thereof
     and what actions the Company and its Subsidiaries have taken and propose to
     take with respect thereto;

          (iii)  within 90 days after the end of each fiscal year, consolidating
     and consolidated statements of income and cash flows of the Company and its
     Subsidiaries for such fiscal year, and consolidating and consolidated
     balance sheets of the Company and its Subsidiaries as of the end of such
     fiscal year, setting forth in each case comparisons to the annual budget
     and to the preceding fiscal year, all prepared in accordance with generally
     accepted accounting principles, consistently applied, and accompanied by
     (a) with respect to the consolidated portions of such statements (except
     with respect to budget data), an opinion containing no exceptions or
     qualifications (except for qualifications regarding specified contingent
     liabilities) of an independent accounting firm of recognized national
     standing acceptable to the Majority Member, and (b) a copy of such firm's
     annual management letter to the Board;

          (iv)   promptly upon receipt thereof, any additional reports,
     management letters or other detailed information concerning significant
     aspects of the Company's operations or financial affairs given to the
     Company by its independent accountants (and not otherwise contained in
     other materials provided hereunder);

          (v)    at least 30 days prior to the beginning of each fiscal year, an
     annual budget prepared on a monthly basis for the Company and its
     Subsidiaries for such fiscal year (displaying anticipated statements of
     income and cash flows), and promptly upon preparation thereof any other
     significant budgets prepared by the Company and any revisions of such
     annual or other budgets, and within 30 days after any monthly period in
     which there is a material adverse deviation from the annual budget, an
     Officer's

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     Certificate explaining the deviation and what actions the Company has taken
     and proposes to take with respect thereto;

          (vi)   promptly (but in any event within 5 business days) after the
     discovery or receipt of notice of any default under any material agreement
     to which it or any of its Subsidiaries is a party or any other event or
     circumstance affecting the Company or any Subsidiary which is reasonably
     likely to have a material adverse effect on the financial condition,
     operating results, assets, operations or business prospects of the Company
     or any Subsidiary (including the filing of any material litigation against
     the Company or any Subsidiary or the existence of any material dispute with
     any Person which involves a reasonable likelihood of such litigation being
     commenced), an Officer's Certificate specifying the nature and period of
     existence thereof and what actions the Company and its Subsidiaries have
     taken and propose to take with respect thereto;

          (vii)  with reasonable promptness, such other information and
     financial data concerning the Company and its Subsidiaries as any Person
     entitled to receive information under this SECTION 3A may reasonably
     request; and

          (viii) within 10 days after transmission thereof, copies of all
     financial statements, proxy statements, reports and any other general
     written communications which the Company sends to its stockholders, and
     copies of all registration statements and all regular, special or periodic
     reports which it files, or any of its officers or directors file with
     respect to the Company, with the Securities and Exchange Commission or with
     any securities exchange on which any of its securities are then listed, and
     copies of all press releases and other statements made available generally
     by the Company to the public concerning material developments in the
     Company's and its Subsidiaries' businesses.

Each of the financial statements referred to in subsections (i) and (iii) shall
be true and correct in all material respects as of the dates and for the periods
stated therein, subject in the case of the unaudited financial statements to
changes resulting from normal year-end audit adjustments (none of which would,
alone or in the aggregate, be materially adverse to the financial condition,
operating results, assets, operations or business prospects of the Company and
its Subsidiaries taken as a whole).

          3B.    INSPECTION OF PROPERTY. The Company shall permit any
representatives designated by Purchaser or the Majority Member (so long as such
Purchaser holds any Stock), upon reasonable notice and during normal business
hours and such other times as any such holder may reasonably request, to (i)
visit and inspect any of the properties of the Company and its Subsidiaries,
(ii) examine the corporate and financial records of the Company and its
Subsidiaries and make copies thereof or extracts therefrom and (iii) discuss the
affairs, finances and accounts of any such corporations with the directors,
officers, key employees and independent accountants of the Company and its
Subsidiaries; PROVIDED THAT the Company shall have the right to have its chief
financial officer present at any meetings with the Company's independent
accountants.

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          3C.    RESTRICTIONS. The Company shall not, without the prior written
consent of the Majority Member:

          (i)    except as expressly contemplated by this Agreement, authorize,
     issue, sell or enter into any agreement providing for the issuance
     (contingent or otherwise), or permit any Subsidiary to authorize, issue,
     sell or enter into any agreement providing for the issuance (contingent or
     otherwise) of, (a) any notes or debt securities containing equity features
     (including any notes or debt securities convertible into or exchangeable
     for equity securities, issued in connection with the issuance of equity
     securities or containing profit participation features) or (b) any equity
     securities (or any securities convertible into or exchangeable for any
     equity securities) or rights to acquire any equity securities, other than
     (X) the issuance of equity securities by a Subsidiary to the Company or
     another Subsidiary or (Y) the issuance of options and common stock by the
     Company pursuant to a stock option plan approved by the Majority Member;

          (ii)   merge or consolidate with any Person or permit any Subsidiary
     to merge or consolidate with any Person (other than a wholly owned
     Subsidiary);

          (iii)  sell, lease or otherwise dispose of, or permit any Subsidiary
     to sell, lease or otherwise dispose of, more than 5% of the consolidated
     assets of the Company and its Subsidiaries (computed on the basis of book
     value, determined in accordance with generally accepted accounting
     principles consistently applied, or fair market value, determined by the
     Board in its reasonable good faith judgment) in any transaction or series
     of related transactions (other than sales of inventory in the ordinary
     course of business);

          (iv)   liquidate, dissolve or effect a recapitalization or
     reorganization in any form of transaction (including any reorganization
     into a limited liability company, a partnership or any other non-corporate
     entity which is treated as a partnership for federal income tax purposes);

          (v)    acquire, or permit any Subsidiary to acquire, any interest in
     any business (whether by a purchase of assets, purchase of stock, merger or
     otherwise), or enter into any joint venture;

          (vi)   enter into, or permit any Subsidiary to enter into, any
     transaction with any of its or any Subsidiary's officers, directors,
     employees or Affiliates or any individual related by blood, marriage or
     adoption to any such Person (a "RELATIVE") or any entity in which any such
     Person or individual owns a beneficial interest (a "RELATED ENTITY"),
     except (X) employment arrangements as approved by the Board and (Y) as
     otherwise expressly contemplated by this Agreement; or

          (vii)  except as expressly contemplated by this Agreement, make any
     amendment to the Certificate of Incorporation, Bylaws or the other
     agreements contemplated hereby, or file any resolution of the Board with
     the Secretary of the State of Delaware, in each case containing any
     provisions which would increase the number of authorized shares of Stock or
     adversely affect or otherwise impair the rights or the

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     relative preferences and priorities of the holders of the Stock under this
     Agreement, the Certificate of Incorporation, the Bylaws or the other
     agreements contemplated hereby.

          3D.    AMENDMENT OF OTHER AGREEMENTS. The Company shall not amend,
modify or waive, or permit to be amended, modified or waived, any provision of
this Agreement, the Acquisition Agreement, the Bank Agreement, the Certificate
of Incorporation or any other agreement with key executives of the Company
without the prior written consent of the Majority Member.

          3E.    UNRELATED BUSINESS TAXABLE INCOME. The Company shall not engage
in any transaction which is reasonably likely to cause the Majority Member or
any of its limited partners which are exempt from income taxation under Section
501(a) of the IRC and, if applicable, any pension plan that any such trust may
be a part of, to recognize unrelated business taxable income as defined in
Section 512 and Section 514 of the IRC.

          3F.    HART-SCOTT-RODINO COMPLIANCE. In connection with any
transaction in which the Company is involved (a "TRANSACTION") which is required
to be reported under the Hart-Scott-Rodino Antitrust Improvements Act of 1976,
as amended from time to time (the "HSR ACT"), the Company shall prepare and file
all documents with the Federal Trade Commission and the United States Department
of Justice which may be required to comply with the HSR Act, and shall promptly
furnish all materials thereafter requested by any of the regulatory agencies
having jurisdiction over such filings, in connection with a Transaction. The
Company shall take all reasonable actions and shall file and use reasonable best
efforts to have declared effective or approved all documents and notifications
with any governmental or regulatory bodies, as may be necessary or may
reasonably be requested under federal antitrust laws for the consummation of the
Transaction. Notwithstanding the foregoing, if the Majority Member, rather than
the Company, is required to make a filing under the HSR Act in connection with a
Transaction, the Company will notify the Majority Member that a filing is
necessary. In such instance the Majority Member shall make such filing, and the
Company will provide to the Majority Member all necessary information for such
filing, will facilitate such filing and will pay all fees associated with such
filing.

          Section 4. TRANSFER OF RESTRICTED SECURITIES.

          4A.    Restricted Securities are transferable only pursuant to (i)
public offerings registered under the Securities Act, (ii) Rule 144 of the
Securities and Exchange Commission (or any similar rule or rules then in force)
if such rule or rules are available and (iii) subject to the conditions
specified in SECTION 4B below, any other legally available means of transfer.

          4B.    In connection with the transfer of any Restricted Securities
(other than a transfer described in SECTIONS 4A(i) or (ii) above), the holder
thereof shall deliver written notice to the Company describing in reasonable
detail the transfer or proposed transfer, together with an opinion of Kirkland &
Ellis or other counsel which (to the Company's reasonable satisfaction) is
knowledgeable in securities law matters to the effect that such transfer of
Restricted Securities may be effected without registration of such Restricted
Securities under the Securities Act. In addition, if the holder of the
Restricted Securities delivers to the Company an opinion of Kirkland & Ellis or
such other counsel that no subsequent transfer of such Restricted Securities

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shall require registration under the Securities Act, the Company shall promptly
upon such contemplated transfer deliver new certificates for such Restricted
Securities which do not bear the Securities Act legend set forth in SECTION 7C.
If the Company is not required to deliver new certificates for such Restricted
Securities not bearing such legend, the holder thereof shall not transfer the
same until the prospective transferee has confirmed to the Company in writing
its agreement to be bound by the conditions contained in this SECTION 4 and
SECTION 7C.

          Section 5. REPRESENTATIONS AND WARRANTIES OF THE COMPANY. As a
material inducement to the Purchaser to enter into this Agreement and purchase
the Stock, the Company hereby represents and warrants to the Purchaser that:

          5A.    ORGANIZATION AND CORPORATE POWER. The Company is a corporation
duly organized, validly existing and in good standing under the laws of Delaware
and is qualified to do business in every jurisdiction in which the failure to so
qualify might reasonably be expected to have a material adverse effect on the
financial condition, operating results, assets, operations or business prospects
of the Company and its Subsidiaries taken as a whole. The Company has all
requisite corporate power and authority and all material licenses, permits and
authorizations necessary to own and operate its properties, to carry on its
businesses as now conducted and presently proposed to be conducted and to carry
out the transactions contemplated by this Agreement. The copies of the Company's
Certificate of Incorporation and Bylaws which have been furnished to the
Purchaser's counsel reflect all amendments made thereto at any time prior to the
date of this Agreement and are correct and complete.

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          5B.    CAPITAL STOCK AND RELATED MATTERS.

          (i)    As of the Closing and immediately thereafter, the authorized
     capital stock of the Company shall consist of 101,300,000 shares of Stock,
     of which 300,000 shares shall be designated as Preferred Stock (240,479.70
     of which shall be issued and outstanding and 59,520.30 of which shall be
     reserved for issuance pursuant to SECTION 1B(ii)), and of which 100,000,000
     shares shall be designated as Class A Common Stock (99,000,000 of which
     shall be issued and outstanding, and 1,000,000 of which shall be reserved
     for issuances upon the conversion of the Class B Common), and of which
     1,000,000 shares shall be designated as Class B Common Stock and which
     shall be reserved for issuances pursuant to the Option Plan. As of the
     Closing, the Company shall not have outstanding any stock or securities
     convertible or exchangeable for any shares of its capital stock or
     containing any profit participation features, nor shall it have outstanding
     any rights or options to subscribe for or to purchase its capital stock or
     any stock or securities convertible into or exchangeable for its capital
     stock or any stock appreciation rights or phantom stock plans other than
     pursuant to and as contemplated by this Agreement. As of the Closing, the
     Company shall not be subject to any obligation (contingent or otherwise) to
     repurchase or otherwise acquire or retire any shares of its capital stock
     or any warrants, options or other rights to acquire its capital stock,
     except pursuant to this Agreement and the Company's Certificate of
     Incorporation. As of the Closing, all of the outstanding shares of the
     Company's capital stock shall be validly issued, fully paid and
     nonassessable.

          (ii)   There are no statutory or, to the best of the Company's
     knowledge, contractual stockholders preemptive rights or rights of refusal
     with respect to the issuance of the Stock hereunder or the issuance of the
     Stock pursuant to SECTION 1B, except as expressly contemplated in the
     Stockholders Agreement or provided herein. Based in part on the investment
     representations of the Purchaser in SECTION 7C hereof, the Company has not
     violated any applicable federal or state securities laws in connection with
     the offer, sale or issuance of any of its capital stock, and the offer,
     sale and issuance of the Stock hereunder and pursuant to SECTION 1B hereof
     do not and will not require registration under the Securities Act or any
     applicable state securities laws.

          5C.    SUBSIDIARIES; INVESTMENTS. Other than any securities acquired
or to be acquired pursuant to the Acquisition Agreement, the Company does not
own or hold any shares of stock or any other security or interest in any other
Person or any rights to acquire any such security or interest, and the Company
has never had any Subsidiary.

          5D.    AUTHORIZATION; NO BREACH. The execution, delivery and
performance of this Agreement, the Acquisition Agreement and all other
agreements contemplated hereby to which the Company is a party have been duly
authorized by the Company. This Agreement, , the Acquisition Agreement, the
Certificate of Incorporation and all other agreements contemplated hereby each
constitutes a valid and binding obligation of the Company, enforceable in
accordance with its terms. The execution and delivery by the Company of this
Agreement, the Acquisition Agreement and all other agreements contemplated
hereby to which the Company is a party, the offering, sale and issuance of the
Stock hereunder and pursuant to SECTION 1B and the fulfillment of and compliance
with the respective terms hereof and thereof by

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the Company do not and will not (i) conflict with or result in a breach of the
terms, conditions or provisions of, (ii) constitute a default under, (iii)
result in the creation of any lien, security interest, charge or encumbrance
upon the Company's capital stock or assets pursuant to, (iv) give any third
party the right to modify, terminate or accelerate any obligation under, (v)
result in a violation of, or (vi) require any authorization, consent, approval,
exemption or other action by or notice to any court or administrative or
governmental body pursuant to, the Certificate of Incorporation or the Bylaws or
any law, statute, rule or regulation to which the Company is subject, or any
agreement, instrument, order, judgment or decree to which the Company is a party
or by which it is bound.

          5E.    CONDUCT OF BUSINESS; LIABILITIES. Other than the negotiation,
execution and delivery of this Agreement, the Acquisition Agreement and the
other agreements contemplated hereby and thereby, prior to the Closing, the
Company has not (i) conducted any business, (ii) incurred any expenses,
obligations or liabilities (whether accrued, absolute, contingent, unliquidated
or otherwise, whether or not known to the Company and whether due or to become
due and regardless of when asserted), (iii) owned any assets, (iv) entered into
any contracts or agreements, or (v) violated any laws or governmental rules or
regulations.

          5F.    LITIGATION, ETC. Other than those items disclosed in the
schedules to the Acquisition Agreement, there are no actions, suits,
proceedings, orders, investigations or claims pending or, to the best of the
Company's knowledge, threatened against or affecting the Company (or to the best
of the Company's knowledge, pending or threatened against or affecting any of
the officers, directors or employees of the Company with respect to their
businesses or proposed business activities) at law or in equity, or before or by
any governmental department, commission, board, bureau, agency or
instrumentality with respect to the transactions contemplated by this Agreement.

          5G.    BROKERAGE. There are no claims for brokerage commissions,
finders, fees or similar compensation in connection with the transactions
contemplated by this Agreement based on any arrangement or agreement binding
upon the Company. The Company shall pay, and hold the Purchaser harmless
against, any liability, loss or expense (including, without limitation,
attorneys, fees and out-of-pocket expenses) arising in connection with any such
claim.

          5H.    GOVERNMENTAL CONSENT, ETC. No permit, consent, approval or
authorization of, or declaration to or filing with, any governmental authority
is required in connection with the execution, delivery and performance by the
Company of this Agreement or the other agreements contemplated hereby, or the
consummation by the Company of any other transactions contemplated hereby or
thereby.

          5I.    DISCLOSURE. Neither this Agreement nor any of the schedules,
attachments, written statements, documents, certificates or other items prepared
or supplied to the Purchaser by or on behalf of the Company with respect to the
transactions contemplated hereby contain any untrue statement of a material fact
or omit a material fact necessary to make each statement contained herein or
therein not misleading. There is no fact which the Company has not disclosed to
the Purchaser in writing and of which any of its officers, directors or
executive employees is aware and which has had or might reasonably be
anticipated to have a material

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adverse effect upon the existing or expected financial condition, operating
results, assets, customer or supplier relations, employee relations or business
prospects of the Company.

          5J.    CLOSING DATE. The representations and warranties of the Company
contained in this SECTION 5 and elsewhere in this Agreement and all information
contained in any exhibit, schedule or attachment hereto or in any writing
delivered by, or on behalf of, the Company to the Purchaser shall be true and
correct in all material respects on the date of the Closing as though then made,
except as affected by the transactions expressly contemplated by this Agreement.

          Section 6. DEFINITIONS. For the purposes of this Agreement, the
following terms have the meanings set forth below:

          "ACQUISITION AGREEMENT" means that certain Stock Purchase Agreement
dated as of December 7, 2001, between Verizon Information Services Inc. and the
Company.

          "AFFILIATE" of any particular person or entity means any other person
or entity controlling, controlled by or under common control with such
particular person or entity. For purposes of this Agreement, all holdings of
Preferred Stock and Common Stock by Persons who are Affiliates of each other
shall be aggregated for purposes of meeting any threshold tests under this
Agreement.

          "BANK AGREEMENT" means that certain credit agreement dated February
14, 2002 among the Company, Lehman Brothers Inc. (as Administrative Agent) and
various lending institutions, as such agreement may be amended, restated,
extended, renewed, supplemented, refinanced, replaced or otherwise modified from
time to time (including, without limitation, by increasing the amount of
available borrowings thereunder or adding any direct or indirect Subsidiaries of
the borrowers as additional borrowers or guarantors thereunder) and whether by
the same or any other agent, lender or group of lenders.

          "BOARD" means the Board of Directors of the Company.

          "COMMON STOCK" means (i) the Class A Common Stock and Class B Common
Stock issued hereunder and (ii) any Common Stock issued or issuable with respect
to the Common Stock referred to in clause (i) above by way of stock dividends,
stock splits or in connection with a combination of shares, recapitalization,
merger, consolidation or other reorganization. As to any particular shares of
Investor Common, such shares shall cease to be Investor Common when they have
been (a) effectively registered under the Securities Act and disposed of in
accordance with the registration statement covering them or (b) distributed to
the public through a broker, dealer or market maker pursuant to Rule 144 under
the Securities Act (or any similar rule then in force).

          "INVESTOR COMMON" shall have the meaning given to such term under the
Unit Purchase Agreement.

          "INVESTOR PREFERRED" shall have the meaning given to such term under
the Unit Purchase Agreement.

                                       10
<Page>

          "IRC" means the Internal Revenue Code of 1986, as amended, and any
reference to any particular IRC Section shall be interpreted to include any
revision of or successor to that Section regardless of how numbered or
classified.

          "MAJORITY MEMBER" means GTCR Fund VII, L.P., a Delaware limited
partnership.

          "OFFICER'S CERTIFICATE" means a certificate signed by the Company's
president or its chief financial officer, stating that (i) the officer signing
such certificate has made or has caused to be made such investigations as are
necessary in order to permit him to verify the accuracy of the information set
forth in such certificate and (ii) to the best of such officer's knowledge, such
certificate does not misstate any material fact and does not omit to state any
fact necessary to make the certificate not misleading.

          "OPTION PLAN" means the employee stock option plan of the Company as
approved and adopted by the Board from time to time.

          "PERSON" means an individual, a partnership, a limited liability
company, a corporation, an association, a joint stock company, a trust, a joint
venture, an unincorporated organization and a governmental entity or any
department, agency or political subdivision thereof.

          "PREFERRED STOCK" means (i) the Preferred Stock issued hereunder and
(ii) any Preferred Stock, issued or issuable with respect to the Preferred Stock
referred to in clause (i) above by way of stock dividends, stock splits or in
connection with a combination of shares, recapitalization, merger, consolidation
or other reorganization. As to any particular shares of Investor Preferred, such
shares shall cease to be Investor Preferred when they have been (a) effectively
registered under the Securities Act and disposed of in accordance with the
registration statement covering them or (b) distributed to the public through a
broker, dealer or market maker pursuant to Rule 144 under the Securities Act (or
any similar rule then in force).

          "STOCK" means the Preferred Stock and the Common Stock.

          "RESTRICTED SECURITIES" means (i) the Stock issued hereunder and
pursuant to SECTION 1B hereof and (ii) any securities issued with respect to the
securities referred to in clause (i) above by way of a stock dividend, stock
split or in connection with a combination of shares, recapitalization, merger,
consolidation or other reorganization. As to any particular Restricted
Securities, such securities shall cease to be Restricted Securities when they
have (a) been effectively registered under the Securities Act and disposed of in
accordance with the registration statement covering them, (b) become eligible
for sale pursuant to Rule 144(k) (or any similar provision then in force) under
the Securities Act or (c) been otherwise transferred and new certificates for
them not bearing the Securities Act legend set forth in SECTION 7C have been
delivered by the Company in accordance with SECTION 4B. Whenever any particular
securities cease to be Restricted Securities, the holder thereof shall be
entitled to receive from the Company, without expense, new securities of like
tenor not bearing a Securities Act legend of the character set forth in SECTION
7C.

          "SECURITIES ACT" means the Securities Act of 1933, as amended, or any
similar federal law then in force.

                                       11
<Page>

          "SECURITIES AND EXCHANGE COMMISSION" includes any governmental body or
agency succeeding to the functions thereof.

          "SUBSIDIARY" means any corporation of which the securities having a
majority of the ordinary voting power in electing the board of directors are, at
the time as of which any determination is being made, owned by the Company
either directly or through one or more Subsidiaries.

          "UNIT PURCHASE AGREEMENT" means that certain Unit Purchase Agreement
dated as of February 14, 2002, by and between the Purchaser, GTCR Fund VII, GTCR
Fund VII/A and GTCR Co-Invest.

          Section 7. MISCELLANEOUS.

          7A.    EXPENSES. The Company agrees to pay, and hold the Purchaser and
all holders of Stock harmless against liability for the payment of, (i) the
reasonable fees and expenses of their counsel arising in connection with the
negotiation and execution of this Agreement and the Acquisition Agreement and
the consummation of the transactions contemplated by this Agreement and the
Acquisition Agreement, (ii) the fees and expenses incurred with respect to any
amendments or waivers (whether or not the same become effective) under or in
respect of this Agreement, the Acquisition Agreement, the other agreements
contemplated hereby and the Certificate of Incorporation, (iii) stamp and other
taxes which may be payable in respect of the execution and delivery of this
Agreement or the issuance, delivery or acquisition of any shares of Stock
purchased hereunder, (iv) the fees and expenses incurred with respect to the
interpretation or enforcement of the rights granted under this Agreement and the
other agreements contemplated hereby and the Certificate of Incorporation and
the Bylaws and (v) such reasonable travel expenses, legal fees and other
out-of-pocket fees and expenses as have been or may be incurred by the
Purchaser, its Affiliates, its members, its members' Affiliates and their
directors, officers and employees in connection with any Company-related
financing and in connection with the rendering of any other services by the
Purchaser, its members or their Affiliates (including fees and expenses incurred
in attending Board or other Company-related meetings).

          7B.    REMEDIES. Each holder of Stock shall have all rights and
remedies set forth in this Agreement and the Certificate of Incorporation and
all rights and remedies which such holders have been granted at any time under
any other agreement or contract and all of the rights which such holders have
under any law. Any Person having any rights under any provision of this
Agreement shall be entitled to enforce such rights specifically (without posting
a bond or other security), to recover damages by reason of any breach of any
provision of this Agreement and to exercise all other rights granted by law.

          7C.    PURCHASER'S INVESTMENT REPRESENTATIONS. The Purchaser hereby
represents (i) that it is acquiring the Restricted Securities purchased
hereunder or acquired pursuant hereto for its own account with the present
intention of holding such securities for purposes of investment, and that it has
no intention of selling such securities in a public distribution in violation of
the federal securities laws or any applicable state securities laws, (ii) that
it is an "accredited investor" and a sophisticated investor for purposes of
applicable U.S. federal and

                                       12
<Page>

state securities laws and regulations, (iii) that this Agreement and each of the
other agreements contemplated hereby constitutes (or will constitute) the legal,
valid and binding obligation of the Purchaser, enforceable in accordance with
its terms, and (iv) that the execution, delivery and performance of this
Agreement and such other agreements by the Purchaser does not and will not
conflict with, violate or cause a breach of any agreement, contract or
instrument to which the Purchaser is subject. Notwithstanding the foregoing,
nothing contained herein shall prevent the Purchaser and subsequent holders of
Restricted Securities from transferring such securities in compliance with the
provisions of SECTION 4 hereof. Each certificate for Restricted Securities shall
be imprinted with a legend in substantially the following form:

          "The securities represented by this certificate were originally issued
          on February 14, 2002 and have not been registered under the Securities
          Act of 1933, as amended. The transfer of the securities represented by
          this certificate is subject to the conditions specified in the Stock
          Purchase Agreement, dated as of February 14, 2002 by and among the
          issuer (the "COMPANY") and certain investors, and the Company reserves
          the right to refuse the transfer of such securities until such
          conditions have been fulfilled with respect to such transfer. A copy
          of such conditions shall be furnished by the Company to the holder
          hereof upon written request and without charge."

          7D.    CONSENT TO AMENDMENTS. Except as otherwise expressly provided
herein, the provisions of this Agreement may be amended and the Company may take
any action herein prohibited, or omit to perform any act herein required to be
performed by it, only if the Company has obtained the written consent of the
Majority Member. No other course of dealing between the Company and the holder
of any Stock or any delay in exercising any rights hereunder or under the
Certificate of Incorporation shall operate as a waiver of any rights of any such
holders. For purposes of this Agreement, shares of Stock held by the Company or
any Subsidiaries shall not be deemed to be outstanding.

          7E.    SURVIVAL OF REPRESENTATIONS AND WARRANTIES. All representations
and warranties contained herein or made in writing by any party in connection
herewith shall survive the execution and delivery of this Agreement and the
consummation of the transactions contemplated hereby, regardless of any
investigation made by the Purchaser or on its behalf.

          7F.    SUCCESSORS AND ASSIGNS. Except as otherwise expressly provided
herein, all covenants and agreements contained in this Agreement by or on behalf
of any of the parties hereto shall bind and inure to the benefit of the
respective successors and assigns of the parties hereto whether so expressed or
not. In addition, and whether or not any express assignment has been made, the
provisions of this Agreement which are for the Purchaser's benefit as a
purchaser or holder of Stock are also for the benefit of, and enforceable by,
any subsequent holder of such Stock. The rights and obligations of the Purchaser
under this Agreement and the agreements contemplated hereby may be assigned by
the Purchaser at any time, in whole or in part, to any of its members or any
successor thereto.

          7G.    GENERALLY ACCEPTED ACCOUNTING PRINCIPLES. Where any accounting
determination or calculation is required to be made under this Agreement or the
exhibits hereto,

                                       13
<Page>

such determination or calculation (unless otherwise provided) shall be made in
accordance with generally accepted accounting principles, consistently applied,
except that if because of a change in generally accepted accounting principles
the Company would have to alter a previously utilized accounting method or
policy in order to remain in compliance with generally accepted accounting
principles, such determination or calculation shall continue to be made in
accordance with the Company's previous accounting methods and policies.

          7H.    SEVERABILITY. Whenever possible, each provision of this
Agreement shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement is held to be prohibited
by or invalid under applicable law, such provision shall be ineffective only to
the extent of such prohibition or invalidity, without invalidating the remainder
of this Agreement.

          7I.    COUNTERPARTS. This Agreement may be executed simultaneously in
two or more counterparts, any one of which need not contain the signatures of
more than one party, but all such counterparts taken together shall constitute
one and the same Agreement.

          7J.    ENTIRE AGREEMENT. This Agreement, those documents expressly
referred to herein and other documents of even date herewith embody the complete
agreement among the parties and supersede and preempt any prior understandings,
agreements or representations by or among the parties, written or oral, which
may have related to the subject matter hereof in any way.

          7K.    DESCRIPTIVE HEADINGS; INTERPRETATION. The descriptive headings
of this Agreement are inserted for convenience only and do not constitute a
section of this Agreement. The use of the word "including" in this Agreement
shall be by way of example rather than by limitation.

          7L.    GOVERNING LAW. The corporate law of Delaware shall govern all
issues concerning the relative rights of the Company and its stockholders. All
other questions concerning the construction, validity and interpretation of this
Agreement and the exhibits and schedules hereto shall be governed by and
construed in accordance with the internal laws of the State of Delaware, without
giving effect to any choice of law or conflict of law provision or rule (whether
of the State of Delaware or any other jurisdiction) that would cause the
application of the laws of any jurisdiction other than the State of Delaware.

          7M.    NOTICES. All notices, demands or other communications to be
given or delivered under or by reason of the provisions of this Agreement shall
be in writing and shall be deemed to have been given when delivered personally
to the recipient, sent to the recipient by reputable express courier service
(charges prepaid) or mailed to the recipient by certified or registered mail,
return receipt requested and postage prepaid. Such notices, demands and other
communications shall be sent to the Purchaser and to the Company at the address
indicated below:

          IF TO THE COMPANY:

                                       14
<Page>

                 TSI Telecommunication Holdings, Inc.
                 201 North Franklin Street
                 Tampa, Florida 33602
                 Attention:  G. Edward Evans
                 Telephone:  (813) 273-3000
                 Facsimile:  (813) 273-4953

          AND

                 TSI Telecommunication Holdings, Inc.
                 201 North Franklin Street
                 Tampa, Florida 33602
                 Attention:  Robert Garcia, Jr.
                 Telephone:  (813) 273-3000
                 Facsimile:  (813) 273-4953

          WITH COPIES TO:

                 GTCR Fund VII, L.P.
                 GTCR Fund VII/A, L.P.
                 GTCR Co-Invest, L.P.
                 c/o GTCR Golder Rauner, L.L.C.
                 6100 Sears Tower
                 Chicago, Illinois 60606-6402
                 Attention:  David A. Donnini
                             Collin E. Roche
                 Telephone: (312) 382-2200
                 Facsimile: (312) 382-2201

          AND

                 Kirkland & Ellis
                 200 East Randolph Drive
                 Chicago, Illinois 60601
                 Attention: Stephen L. Ritchie
                 Telephone: (312) 861-2210
                 Facsimile: (312) 861-2200

                                       15
<Page>

          IF TO THE PURCHASER:

                 TSI Telecommunication Holdings, LLC
                 201 North Franklin Street
                 Tampa, Florida 33602
                 Attention:  G. Edward Evens
                 Telephone: (813) 273-3000
                 Facsimile: (813) 273-4953

          WITH COPIES TO:

                 GTCR Fund VII, L.P.
                 GTCR Fund VII/A, L.P.
                 GTCR Co-Invest, L.P.
                 c/o GTCR Golder Rauner, L.L.C.
                 6100 Sears Tower
                 Chicago, Illinois 60606-6402
                 Attention:  David A. Donnini
                             Collin E. Roche
                 Telephone: (312) 382-2200
                 Facsimile: (312) 382-2201

          AND

                 Kirkland & Ellis
                 200 East Randolph Drive
                 Chicago, Illinois 60601
                 Attention: Stephen L. Ritchie
                 Telephone: (312) 861-2210
                 Facsimile: (312) 861-2200

or to such other address or to the attention of such other person as the
recipient party has specified by prior written notice to the sending party.

                                    * * * * *

                                       16
<Page>

          IN WITNESS WHEREOF, the parties hereto have executed this Purchase
Agreement on the date first written above.

                                            TSI TELECOMMUNICATION HOLDINGS, INC.

                                            By:   /s/ G. Edward Evans
                                            Name: G. Edward Evans
                                            Its:  Chief Executive Officer

                                            TSI TELECOMMUNICATION HOLDINGS, LLC

                                            By:   /s/ G. Edward Evans
                                            Name: G. Edward Evans
                                            Its:  Chief Executive Officer<Page>

                                                                   EXHIBIT 10.19

                               PURCHASE AGREEMENT

          THIS PURCHASE AGREEMENT (this "AGREEMENT") is made as of February 14,
2002, by and between TSI Telecommunication Holdings, LLC, a Delaware limited
liability company (the "COMPANY"), and Snowlake Investment Pte Ltd
("PURCHASER").

          The Company and Purchaser desire to enter into an agreement pursuant
to which Purchaser will purchase, and the Company will sell 29,690.29 Class B
Preferred Units of the Company (the "CLASS B PREFERRED") and 9,300,476.95 Common
Units of the Company (the "COMMON UNITS"). All Class B Preferred and Common
Units acquired by Purchaser pursuant to this Agreement are referred to herein as
"CO-INVEST UNITS". Except as otherwise indicated herein, capitalized terms used
herein are defined in SECTION 6 of this Agreement.

          Concurrently with the execution and delivery of this Agreement by the
Company and Purchaser, GTCR Fund VII, L.P., a Delaware limited partnership
("GTCR FUND VII"), GTCR Fund VII/A, L.P., a Delaware limited partnership ("GTCR
FUND VII/A"), GTCR Co-Invest, L.P., a Delaware limited partnership ("GTCR
CO-INVEST", and together with GTCR Fund VII, GTCR Fund VII/A and any other
investment fund managed by GTCR Golder Rauner, L.L.C., each an "INVESTOR" and
collectively, the "INVESTORS") will enter into a unit purchase agreement with
the Company (the "INVESTOR PURCHASE AGREEMENT") pursuant to which the Investors
will purchase Class B Preferred and Common Units in accordance with the terms
thereof. Certain provisions of this Agreement are intended for the benefit of,
and will be enforceable by, the Investors.

          NOW, THEREFORE, in consideration of the mutual covenants contained
herein and other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties to this Agreement hereby agree as
follows:

          Section 1.  PURCHASE AND CLOSING.

          Section 1A. PURCHASE AND SALE OF THE CO-INVEST UNITS. Subject to the
terms and conditions set forth herein, at the Closing (as defined in SECTION 1B
below) the Company shall sell to Purchaser, and Purchaser shall purchase from
the Company, 9,300,476.95 Common Units at a price of $0.0333 per unit, and
29,690.29 units of Class B Preferred at a price of $1,000 per unit.

          Section 1B. THE CLOSING. The closing of the purchase and sale of the
Co-Invest Units to be purchased pursuant to SECTION 1A (the "CLOSING") shall
take place at the offices of Kirkland & Ellis, Citigroup Center, 153 East 53rd
Street, New York, New York 10022 at 10:00 a.m. on February 14, 2002, or at such
other place or on such other date as may be mutually agreeable to the Company
and Purchaser. At the Closing, (i) the Company shall deliver to Purchaser
certificates evidencing the Co-Invest Units to be purchased by Purchaser,
registered in Purchaser's name, upon payment of the purchase price thereof by a
cashier's or certified check, or by wire transfer of immediately available funds
to such account as designated by the Company and (ii) the Purchaser

                                       -1-
<Page>

will execute and deliver, this Agreement, the Securityholders Agreement, the
Registration Agreement and the LLC Agreement and each of the other agreements
contemplated hereby (the "TRANSACTION DOCUMENTS") and make the investment in the
Company described in SECTION 1A above.

          Section 1C. SUBSEQUENT INVESTMENTS. Pursuant to and in accordance with
SECTION 1B(ii) of the Investor Purchase Agreement, the Investors may provide
additional equity financing to the Company from time to time after the Initial
Closing (as defined in the Investor Purchase Agreement) by purchasing (i) Class
B Preferred Units, (ii) Common Units or (iii) any combination of such Securities
at such prices, amounts and in such proportions as the Investors or their
Affiliates may determine. Purchaser acknowledges that the Investors may, at
their option, provide such additional equity financing to the Company, in whole
or in part, by purchasing Common Units at a per unit price, equal to the lower
of Original Cost or Fair Market Value (as defined in the LLC Agreement). Any
such investment made by the Investors shall be subject to rights of Purchaser
under SECTION 5 ("Pre-Emptive Rights") of the Securityholders Agreement.

          Section 2.  CONDITIONS OF PURCHASER'S OBLIGATIONS AT THE CLOSING. The
obligation of Purchaser to purchase and pay for the Co-Invest Units to be
purchased by it at the Closing is subject to the satisfaction as of the Closing
of the following conditions:

          Section 2A. REPRESENTATIONS AND WARRANTIES; COVENANTS. The
representations and warranties of the Company contained in SECTION 5 hereof
shall be true and correct at and as of the Closing except to the extent of
changes caused by the transactions expressly contemplated herein (or in any
related Transaction Documents (defined in SECTION 2H(b) hereof)), and the
Company shall have performed in all material respects all of the covenants
required to be performed by it hereunder prior to the Closing.

          Section 2B. INVESTOR PURCHASE AGREEMENT. The Investors and the Company
shall have entered into the Investor Purchase Agreement, the Investor Purchase
Agreement shall not have been amended or modified and shall be in full force and
effect as of the Closing, and the Investors shall have purchased the Company's
Class B Preferred Units and Common Units proposed to be purchased by the
Investors thereunder.

          Section 2C. CERTIFICATE OF FORMATION. The Company's certificate of
formation (the "CERTIFICATE OF FORMATION") in the form attached hereto as
EXHIBIT A shall be in full force and effect under the laws of Delaware as of the
Closing.

          Section 2D. LIMITED LIABILITY AGREEMENT. The Company and the members
of the Company shall have entered into a Limited Liability Company Agreement in
form and substance substantially similar to EXHIBIT B attached hereto (the "LLC
AGREEMENT"), and the LLC Agreement shall be in full force and effect as of the
Closing.

          Section 2E. SECURITYHOLDERS AGREEMENT. The Company, the Investors and
Purchaser shall have entered into a securityholders agreement in form and
substance substantially similar to EXHIBIT C attached hereto (the
"SECURITYHOLDERS AGREEMENT"). The Securityholders Agreement shall be in full
force and effect as of the Closing, and the parties to the Securityholders

                                       -2-
<Page>

Agreement shall not be in breach of any of the terms thereof.

          Section 2F. REGISTRATION RIGHTS AGREEMENT. The Company, the Investors
and Purchaser shall have entered into a registration rights agreement in form
and substance substantially similar to EXHIBIT D attached hereto (the
"REGISTRATION AGREEMENT"). The Registration Agreement shall be in full force and
effect as of the Closing, and the parties to the Registration Agreement shall
not be in breach of any of the terms thereof.

          Section 2G. PROFESSIONAL SERVICES AGREEMENT. The Company or a
Subsidiary and GTCR Golder Rauner, L.L.C. shall have entered into a professional
services agreement in form and substance substantially similar to EXHIBIT E
attached hereto (the "PROFESSIONAL SERVICES AGREEMENT"). The Professional
Services Agreement shall be in full force and effect as of the Closing, and the
parties to the Professional Services Agreement shall not be in breach of any of
the terms thereof.

          Section 2H. ACQUISITION AGREEMENT. The Acquisition Agreement shall be
in full force and effect as of the Closing, and the parties to the Acquisition
Agreement shall not be in breach of any of the terms thereof.

          Section 2I. CLOSING DOCUMENTS. The Company shall have delivered to
Purchaser all of the following documents:

          (a) an Officer's Certificate, dated the date of the Closing, stating
that the conditions specified in SECTION 1 and SECTIONS 2A through 2G,
inclusive, have been fully satisfied;

          (b) certified copies of the resolutions duly adopted by the Company's
Board of Managers (the "BOARD") authorizing the execution, delivery and
performance of this Agreement, the Stockholders Agreement, the Registration
Agreement, the Investor Purchase Agreement and each of the other agreements
contemplated hereby (the "TRANSACTION DOCUMENTS"), the issuance and sale of the
Co-Invest Units and the consummation of all other transactions contemplated by
this Agreement; and

          (c) certified copies of the Certificate of Formation and LLC Agreement
as in effect at the Closing.

          Section 2J. FEES AND EXPENSES. The Company shall have reimbursed
Purchaser for its fees and expenses as provided in SECTION 3E hereof.

          Section 2K. COMPLIANCE WITH APPLICABLE LAWS. The purchase of Co-Invest
Units by Purchaser hereunder shall not be prohibited by any applicable law or
governmental regulation, shall not subject Purchaser to any penalty, liability
or, in Purchaser's]sole judgment, other onerous conditions under or pursuant to
any applicable law or governmental regulation, and shall be permitted by laws
and regulations of the jurisdictions to which Purchaser is subject.

          Section 2L. WAIVER. Any condition specified in this SECTION 2 may be
waived only if such waiver is set forth in a writing executed by Purchaser.

                                       -3-
<Page>

          Section 3.  COVENANTS OF THE COMPANY.

          Section 3A. FINANCIAL STATEMENTS AND OTHER INFORMATION. The Company
shall deliver to Purchaser (so long as it holds any Co-Invest Units):

          (a) as soon as available but in any event within 30 days after the end
of each monthly accounting period in each fiscal year, unaudited consolidating
and consolidated statements of income and cash flows of the Company and its
Subsidiaries for such monthly period and for the period from the beginning of
the fiscal year to the end of such month, and consolidating and consolidated
balance sheets of the Company and its Subsidiaries as of the end of such monthly
period, all prepared in accordance with generally accepted accounting
principles, consistently applied, subject to the absence of footnote disclosures
and to normal year-end and audit adjustments;

          (b) accompanying the financial statements referred to in SUBSECTION
(i) above, an Officer's Certificate, to the extent such Officer's Certificate is
provided to the Investors, stating that neither the Company nor any of its
Subsidiaries is in default under any of its material agreements or, if any such
default exists, specifying the nature and period of existence thereof and what
actions the Company and its Subsidiaries have taken and propose to take with
respect thereto;

          (c) within 90 days after the end of each fiscal year, consolidating
and consolidated statements of income and cash flows of the Company and its
Subsidiaries for such fiscal year, and consolidating and consolidated balance
sheets of the Company and its Subsidiaries as of the end of such fiscal year,
all prepared in accordance with generally accepted accounting principles,
consistently applied, and accompanied by (i) with respect to the consolidated
portions of such statements, an opinion of a independent accounting firm of
recognized national standing reasonably acceptable to Purchaser and (ii) a copy
of such firm's annual management letter to the Board;

          (d) within ten (10) days after transmission thereof, copies of all
financial statements, proxy statements, reports and any other general written
communications which the Company sends to its equityholders and copies of all
registration statements and all regular, special or periodic reports which it
files, or any of its officers or directors file with respect to the Company,
with the Securities and Exchange Commission or with any securities exchange on
which any of the Company's securities are then listed, and copies of all press
releases and other statements made available generally by the Company to the
public concerning material developments in the Company's and its Subsidiaries'
businesses;

          (e) promptly upon receipt thereof, any additional reports, management
letters or other detailed information concerning significant aspects of the
Company's operations or financial affairs given to the Company by its
independent accountants (and not otherwise contained in other materials provided
hereunder);

          (f) promptly (but in any event within five (5) business days) after
the discovery or receipt of notice of any default under any material agreement
to which the Company or any of its Subsidiaries is a party or any other event or
circumstance affecting the Company or any Subsidiary which is reasonably likely
to have a material adverse effect on the financial condition, operating

                                       -4-
<Page>

results, assets, operations or business prospects of the Company or any
Subsidiary (including the filing of any material litigation against the Company
or any Subsidiary or the existence of any material dispute with any Person which
involves a reasonable likelihood of such litigation being commenced), an
Officer's Certificate, to the extent such Officer's Certificate is provided to
the Investors, specifying the nature and period of existence thereof and what
actions the Company and its Subsidiaries have taken and propose to take with
respect thereto; and

          (g) with reasonable promptness, such other information and financial
data concerning the Company and its Subsidiaries as any Person entitled to
receive information under this SECTION 3A may reasonably request.

The obligations of the Company under this SECTION 3A shall terminate upon the
consummation of a Public Offering.

          Section 3B. CURRENT PUBLIC INFORMATION. At all times after the Company
(or its successor) has filed a registration statement with the Securities and
Exchange Commission pursuant to the requirements of either the Securities Act or
the Securities Exchange Act, the Company (or its successor) shall file all
reports required to be filed by it under the Securities Act and the Securities
Exchange Act and the rules and regulations adopted by the Securities and
Exchange Commission thereunder and shall take such further action as any holder
or holders of Restricted Securities may reasonably request, all to the extent
required to enable such holders to sell Restricted Securities pursuant to (a)
Rule 144 adopted by the Securities and Exchange Commission under the Securities
Act (as such rule may be amended from time to time) or any similar rule or
regulation hereafter adopted by the Securities and Exchange Commission or (b) a
registration statement on Form S-2 or S-3 or any similar registration form
hereafter adopted by the Securities and Exchange Commission. Upon request, the
Company (or its successor) shall deliver to any holder of Restricted Securities
a written statement as to whether it has complied with such requirements.

          Section 3C. PUBLIC DISCLOSURES. The Company shall not, nor shall it
permit any Subsidiary to, disclose Purchaser's or any of its Affiliates' names
or identities as an investor in the Company in any press release or other public
announcement or in any document or material filed with any governmental entity,
without the prior written consent of Purchaser, unless such disclosure is
required by applicable law or governmental regulations or by order of a court of
competent jurisdiction, in which case prior to making such disclosure the
Company shall use reasonable efforts to give written notice to Purchaser
describing in reasonable detail the proposed content of such disclosure and
permit Purchaser to review and comment upon the form and substance of such
disclosure.

          Section 3D. EFFECTIVELY CONNECTED INCOME. The Company will use
reasonable best efforts not to engage in, or invest in any entity that is
treated as a flow-through entity for U.S. federal income tax purposes that
engages in, (a) any "commercial activity" as defined in Section 892(a)(2)(i) of
the IRC or (b) transactions which will cause the Company to incur income that is
effectively connected with a "trade or business within the United States" as
defined in Section 864(b) of the IRC.

                                       -5-
<Page>

          Section 3E. EXPENSES. The Company agrees to pay or cause a Subsidiary
to pay (i) the reasonable fees and expenses of Purchaser's counsel arising in
connection with the negotiation and execution of this Agreement and the
consummation of the transactions contemplated by this Agreement, (ii) the fees
and expenses incurred with respect to any amendments or waivers (whether or not
the same become effective) under or in respect of this Agreement, (iii) stamp
and other taxes which may be payable in respect of the execution and delivery of
this Agreement or the issuance, delivery or acquisition of any Co-Invest Units
purchased hereunder and (iv) such reasonable travel expenses, and other
out-of-pocket fees and expenses as have been or may be incurred by Purchaser and
its Affiliates' directors, officers and employees in connection with or incurred
in attending board of managers or other Company-related meetings).

          Section 3F. RESTRICTIONS. Prior to the consummation of a Public
Offering, the Company shall not, without the prior consent of the Purchaser and
the Majority Holders (as defined in the Investor Purchase Agreement) permit any
Subsidiary to authorize, issue, sell or enter into any agreement with the
Investors or their Affiliates providing for the issuance (contingent or
otherwise) of, (i) any notes or debt securities containing equity features
(including, without limitation, any notes or debt securities convertible into or
exchangeable for equity securities, issued in connection with the issuance of
equity securities or containing profit participation features) or (ii) any
equity securities (or any securities convertible into or exchangeable for any
equity securities) or rights to acquire any equity securities, other than (A)
the issuance of equity securities by a Subsidiary to the Company or to another
Subsidiary, (B) the issuance of options and common stock pursuant to an employee
stock option plan as approved and adopted by the Board from time to time; (C)
the issuance of equity securities by a Subsidiary in connection with a Public
Offering,, (D) the issuance of equity securities by a Subsidiary in connection
with a Public Sale or (E) the issuance of equity securities by a Subsidiary to
any Person (other than any Unitholder (as defined in the LLC Agreement) on the
date hereof and its Affiliates)) in connection with an equity investment in such
Subsidiary by such Person.

          Section 4.  TRANSFER OF RESTRICTED SECURITIES.

          (a) Except for transfers to Permitted Transferees, Restricted
Securities are transferable only pursuant to (i) Public Sales and (ii) subject
to the conditions specified in CLAUSE (b) below, any other legally available
means of transfer.

          (b) In connection with the transfer of any Restricted Securities
(other than a transfer described in SECTION 4(a)(i) above), the holder thereof
shall deliver written notice to the Company describing in reasonable detail the
transfer or proposed transfer, and, if requested by the Company, shall be
accompanied by an opinion of counsel which (to the Company's reasonable
satisfaction) is knowledgeable in securities law matters to the effect that such
transfer of Restricted Securities may be effected without registration of such
Restricted Securities under the Securities Act. In addition, if the holder of
the Restricted Securities delivers to the Company an opinion of counsel that no
subsequent transfer of such Restricted Securities shall require registration
under the Securities Act, the Company shall promptly upon such contemplated
transfer deliver new certificates for such Restricted Securities which do not
bear the Securities Act legend set forth in SECTION 7B. Notwithstanding the
foregoing, after a Public Offering, the cost of obtaining the opinion of counsel
pursuant to this SECTION 4(b) shall be borne by the Company.

                                       -6-
<Page>

          (c) Any transfer or attempted transfer of any Restricted Securities in
violation of any provision of this Agreement is void, and the Company shall not
record such transfer on its books or treat any purported transferee of such
Restricted Securities as the owner of such Restricted Securities for any
purpose.

          Section 5.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY. As a
material inducement to Purchaser to enter into this Agreement and purchase the
Co-Invest Units, the Company hereby represents and warrants to Purchaser that:

          Section 5A. ORGANIZATION AND CORPORATE POWER. The Company is a limited
liability company, duly organized, validly existing and in good standing under
the laws of Delaware and is qualified to do business in every jurisdiction in
which the failure to so qualify might reasonably be expected to have a material
adverse effect on the financial condition, operating results, assets, operations
or business prospects of the Company and its Subsidiaries taken as a whole. The
Company has all requisite power and authority and all material licenses, permits
and authorizations necessary to own and operate its properties, to carry on its
businesses as now conducted and presently proposed to be conducted and to carry
out the transactions contemplated by this Agreement. The copies of the Company's
Certificate of Formation and LLC Agreement which have been furnished to
Purchaser reflect all amendments made thereto at any time prior to the date of
this Agreement and are correct and complete.

          Section 5B. EQUITY SECURITIES AND RELATED MATTERS.

          (a) As of the Closing and immediately thereafter, the authorized
equity securities of the Company shall consist of the following: (i) an
unlimited number of units designated as Class A Preferred Units, none of which
shall be issued and outstanding and all of which may only be issued in exchange
for other equity securities of the Company pursuant to the terms of a Senior
Management Agreement; (ii) an unlimited number of units designated as Class B
Preferred Units, 252,367.50 of which shall be issued and outstanding; and (iii)
an unlimited number of units designated as Common Units, 89,099,099.10 of which
shall be issued and outstanding and 990,990.99 of which shall be reserved for
issuance to other executives of the Company and its Subsidiaries as determined
by the Board. As of the Closing, the Company shall not have outstanding any
securities convertible or exchangeable for any equity securities of the Company
or containing any profit participation features, nor shall it have outstanding
any rights or options to subscribe for or to purchase its equity securities or
any securities convertible into or exchangeable for its equity securities or any
equity appreciation rights or phantom equity plans other than pursuant to and as
contemplated by this Agreement, the Investor Purchase Agreement, the LLC
Agreement and the Senior Management Agreements. As of the Closing, the Company
shall not be subject to any obligation (contingent or otherwise) to repurchase
or otherwise acquire or retire any of its equity securities or any warrants,
options or other rights to acquire its equity securities, except pursuant to
this Agreement, the Investor Purchase Agreement, the LLC Agreement, the Senior
Management Agreements and the Company's Certificate of Formation. As of the
Closing, all of the Company's outstanding equity securities shall be validly
issued, fully paid and nonassessable.

                                       -7-
<Page>

          (b) When issued in compliance with the provisions of this Agreement,
the Co-Invest Units will be free of any security interests, claims, liens,
pledges, options, encumbrances, charges, agreements, voting trusts, proxies and
other arrangements or restrictions whatsoever ("ENCUMBRANCES"), other than under
federal and state securities laws and other than Encumbrances arising under any
other agreement or instrument to which Purchaser is a party.

          (c) There are no statutory or contractual securityholders preemptive
rights or rights of refusal with respect to the issuance of the Co-Invest Units
hereunder, except as expressly contemplated in the Securityholders Agreement or
as provided in the Investor Purchase Agreement. Based in part on the investment
representations of Purchaser in SECTION 7B of this Agreement, the offer, sale or
issuance of any of the Company's equity securities, and the offer, sale and
issuance of the Co-Invest Units pursuant to SECTION 1B hereof do not and will
not require registration under the Securities Act or any applicable state
securities laws.

          Section 5C. SUBSIDIARIES; INVESTMENTS. Prior to the effectiveness of
the Merger (as defined in the Acquisition Agreement) Newco, Merger Sub, TSI
Finance Inc., a Delaware corporation ("FINANCE") and TSI Networks Inc., a
Delaware corporation ("NETWORKS") are the Company's only Subsidiaries. The
Company owns directly or indirectly 100% of the capital stock of each of Newco,
Merger Sub, Finance and Networks. Each of Newco, Merger Sub, Finance and
Networks is duly organized, validly existing and in good standing under the laws
of Delaware, possesses all requisite corporate power and authority and all
material licenses, permits and authorizations necessary to own its properties
and to carry on its business as now being conducted and as presently proposed to
be conducted and is qualified to do business in every jurisdiction in which its
ownership of property or the conduct of its business requires it to qualify.

          Section 5D. AUTHORIZATION; NO BREACH. The execution, delivery and
performance of this Agreement and the other Transaction Documents to which the
Company is a party have been duly authorized by the Company. This Agreement and
all other Transaction Documents each constitutes a valid and binding obligation
of the Company, enforceable in accordance with its terms. The execution and
delivery by the Company of this Agreement and all other agreements contemplated
hereby to which the Company is a party, the offering, sale and issuance of the
Co-Invest Units hereunder and the fulfillment of and compliance with the
respective terms hereof and thereof by the Company do not and will not (i)
conflict with or result in a breach of the terms, conditions or provisions of,
(ii) constitute a default under, (iii) result in the creation of any lien,
security interest, charge or encumbrance upon the Company's equity securities or
assets pursuant to, (iv) give any third party the right to modify, terminate or
accelerate any obligation under, (v) result in a violation of or (vi) require
any authorization, consent, approval, exemption or other action by or notice to
any court or administrative or governmental body pursuant to, the Certificate of
Formation of the Company, the LLC Agreement or any law, statute, rule or
regulation to which the Company is subject, or any agreement, instrument, order,
judgment or decree to which the Company is a party or by which it is bound.

          Section 5E. LITIGATION, ETC. There are no actions, suits, proceedings,
orders, investigations or claims pending or threatened against or, to the best
of the Company's knowledge, affecting the Company (or to the best of the
Company's knowledge, pending or threatened against or

                                       -8-
<Page>

affecting any of the officers, directors or employees of the Company with
respect to their businesses or proposed business activities) at law or in
equity, or before or by any governmental department, commission, board, bureau,
agency or instrumentality with respect to the transactions contemplated by this
Agreement.

          Section 5F. CONDUCT OF BUSINESS; LIABILITIES. Other than in connection
with (x) the negotiation, execution and delivery of this Agreement, the
Securityholders Agreement, the Registration Agreement, the Professional Services
Agreement, the Acquisition Agreement and the transactions contemplated in
connection therewith, including any financing transactions, the Company has not
(i) conducted any business, (ii) incurred any expenses, obligations or
liabilities (whether accrued, absolute, contingent, unliquidated or otherwise,
whether or not known to the Company and whether due or to become due and
regardless of when asserted), (iii) owned any assets, (iv) entered into any
contracts or agreements, or (v) violated any laws or governmental rules or
regulations.

          Section 5G. BROKERAGE. Except for (i) TSI's obligations under the
Professional Services Agreement, (ii) fees payable to Cook Associates for
services rendered to TSI in connection with the transactions contemplated by the
Senior Management Agreement of G. Edward Evans and (iii) fees payable to Lehman
Brothers Inc. as financial advisor to the Company in connection with the
transactions contemplated by the Acquisition Agreement, there are no claims for
brokerage commissions, finder's fees or similar compensation in connection with
the transactions contemplated by this Agreement based on any arrangement or
agreement binding upon the Company. The Company shall pay, and hold Purchaser
harmless against, any liability, loss or expense (including, without limitation,
attorneys' fees and out-of-pocket expenses) arising in connection with any such
claim.

          Section 5H. GOVERNMENTAL CONSENT, ETC. No permit, consent, approval or
authorization of, or declaration to or filing with, any governmental authority
is required in connection with the execution, delivery and performance by the
Company of this Agreement or the other Transaction Documents.

          Section 5I. DISCLOSURE. To the knowledge of the Company, neither this
Agreement nor any other agreement refereed to herein (including the schedules
thereto) contain any untrue statement of a material fact or omit a material fact
necessary to make each statement contained herein or therein not misleading.
There is no fact which the Company has not disclosed to the Purchaser and of
which any of its officers or directors is aware and which has had or might
reasonably be anticipated to have a material adverse effect upon the existing or
expected financial condition, operating results or assets of the Company and its
Subsidiaries taken as a whole.

          Section 5J. CLOSING DATE. The representations and warranties of the
Company contained in this SECTION 5 and elsewhere in this Agreement and all
information contained in any exhibit, schedule or attachment hereto or in any
writing delivered by, or on behalf of, the Company to Purchaser shall be true
and correct in all material respects on the date of the Closing as though then
made, except as affected by the transactions contemplated by this Agreement and
the other Transaction Documents.

                                       -9-
<Page>

          Section 6.  DEFINITIONS. For the purposes of this Agreement, the
following terms have the meanings set forth below:

          "ACQUISITION AGREEMENT" means that certain Amended and Restated
Agreement of Merger dated as of January 14, 2002 and effective as of December 7,
2001, as amended, among TSI Telecommunication Holdings, Inc., TSI Merger Sub,
Inc. TSI Telecommunication Services Inc. and Verizon Information Services Inc.

          "AFFILIATE" of any particular Person means any other Person
controlling, controlled by or under common control with such particular person
or entity. For purposes of this Agreement, all holdings of Class B Preferred
Units and Common Units by Persons who are Affiliates of each other shall be
aggregated for purposes of meeting any threshold tests under this Agreement.

          "IRC" means the Internal Revenue Code of 1986, as amended, and any
reference to any particular IRC Section shall be interpreted to include any
revision of or successor to that Section regardless of how numbered or
classified.

          "LLC AGREEMENT" means the Limited Liability Company Agreement of the
Company, as the same may be amended or modified in accordance with its terms.

          "OFFICER'S CERTIFICATE" means a certificate signed by the Company's
chief executive officer or its chief financial officer, stating that (i) the
officer signing such certificate has made or has caused to be made such
investigations as are reasonably necessary in order to permit him to verify the
accuracy of the information set forth in such certificate and (ii) to the best
of such officer's knowledge, such certificate does not misstate any material
fact and does not omit to state any fact necessary to make the certificate not
misleading.

          "ORIGINAL COST" means, with respect to each Common Unit, $0.0333 (as
proportionately adjusted for all subsequent unit splits, unit dividends and
other recapitalizations).

          "PERMITTED TRANSFEREES" means a Person's Affiliates.

          "PERSON" means an individual, a partnership, a limited liability
company, a corporation, an association, a joint stock company, a trust, a joint
venture, an unincorporated organization and a governmental entity or any
department, agency or political subdivision thereof.

          "PUBLIC OFFERING" means the sale in a public offering registered under
the Securities Act of equity securities of the Company or a corporate successor
to the Company.

          "PUBLIC SALE" means any sale of securities to the public pursuant to
an offering registered under the Securities Act or to the public through a
broker, dealer or market maker pursuant to the provisions of Rule 144 adopted
under the Securities Act (other than Rule 144(k) prior to a Public Offering.

          "RESTRICTED SECURITIES" means (i) the Co-Invest Units issued hereunder
and (ii) any securities issued with respect to the securities referred to in
clause (i) above by way of a stock

                                      -10-
<Page>

dividend or stock split or in connection with a combination of shares,
recapitalization, merger, consolidation or other reorganization. As to any
particular Restricted Securities, such securities shall cease to be Restricted
Securities when they have been (a) sold in a Public Sale, (b) repurchased by the
Company or any Subsidiary thereof, or (c) sold to the public through a broker,
dealer or market maker in compliance with Rule 144 (or any similar rule then in
force) under the Securities Act. Whenever any particular securities cease to be
Restricted Securities, the holder thereof shall be entitled to receive from the
Company, without expense, new securities of like tenor not bearing a Securities
Act legend of the character set forth in SECTION 7B.

          "SECURITIES ACT" means the Securities Act of 1933, as amended, or any
similar federal law then in force.

          "SECURITIES EXCHANGE ACT" means the Securities Exchange Act of 1934,
as amended, or any similar federal law then in force.

          "SECURITIES AND EXCHANGE COMMISSION" includes any governmental body or
agency succeeding to the functions thereof.

          "SENIOR MANAGEMENT AGREEMENT" means, that certain Senior Management
Agreement entered into on the date hereof by and between the Company, TSI Merger
Sub, Inc. and G. Edward Evans, or any other agreement for the sale of equity
securities between the Company and any employee of the Company or its
Subsidiaries, as approved by the Board.

          "SUBSIDIARY" means, with respect to any Person, any corporation,
limited liability company, partnership, association, or other business entity of
which (i) if a corporation, a majority of the total voting power of equity
securities entitled (without regard to the occurrence of any contingency) to
vote in the election of directors, managers, or trustees thereof is at the time
owned or controlled, directly or indirectly, by that Person or one or more of
the other Subsidiaries of that Person or a combination thereof, or (ii) if a
limited liability company, partnership, association, or other business entity, a
majority of the partnership or other similar ownership interest thereof is at
the time owned or controlled, directly or indirectly, by any Person or one or
more Subsidiaries of that person or a combination thereof. For purposes hereof,
a Person or Persons shall be deemed to have a majority ownership interest in a
limited liability company, partnership, association, or other business entity if
such Person or Persons shall be allocated a majority of limited liability
company, partnership, association, or other business entity gains or losses or
shall be or control the managing general partner of such limited liability
company, partnership, association, or other business entity. Reference to any
"Subsidiary" shall be given effect only at such times as the Person or Persons
has one or more Subsidiaries.

          Section 7.  Miscellaneous.

          Section 7A. REMEDIES. Each holder of Co-Invest Units shall have all
rights and remedies set forth in this Agreement, the Certificate of Formation,
and the LLC Agreement and all rights and remedies which such holders have been
granted at any time under any other Transaction Document. Any Person having any
rights under any provision of this Agreement shall be entitled to

                                      -11-
<Page>

enforce such rights specifically (without posting a bond or other security), to
recover damages by reason of any breach of any provision of this Agreement and
to exercise all other rights granted by law.

          Section 7B. PURCHASER'S INVESTMENT REPRESENTATIONS. Purchaser hereby
represents (i) that it is acquiring the Co-Invest Units purchased hereunder or
acquired pursuant hereto for its own account with the present intention of
holding such securities for purposes of investment, and that it has no intention
of selling such securities in a public distribution in violation of the federal
securities laws or any applicable state securities laws, (ii) that it is an
"accredited investor" and a sophisticated investor for purposes of applicable
U.S. federal and state securities laws and regulations, (iii) that this
Agreement and each of the other agreements contemplated hereby constitutes (or
will constitute) the legal, valid and binding obligation of each of them,
enforceable in accordance with its terms and (iv) that the execution, delivery
and performance of this Agreement and such other agreements by them does not and
will not conflict with, violate or cause a breach of any agreement, contract or
instrument to which it is subject. Notwithstanding the foregoing, nothing
contained herein shall prevent Purchaser and subsequent holders of Co-Invest
Units from transferring such securities in compliance with the provisions of
SECTION 4 hereof. Each certificate for Co-Invest Units shall be imprinted with a
legend in substantially the following form:

          "THE SECURITIES REPRESENTED BY THIS CERTIFICATE WERE ORIGINALLY
          ISSUED ON FEBRUARY 14, 2002 AND HAVE NOT BEEN REGISTERED UNDER
          THE SECURITIES ACT OF 1933, AS AMENDED. THE TRANSFER OF THE
          SECURITIES REPRESENTED BY THIS CERTIFICATE IS SUBJECT TO THE
          CONDITIONS SPECIFIED IN THE PURCHASE AGREEMENT, DATED AS OF
          FEBRUARY 14, 2002 BY AND AMONG THE ISSUER (THE "COMPANY") AND
          CERTAIN INVESTORS, AND THE COMPANY RESERVES THE RIGHT TO REFUSE
          THE TRANSFER OF SUCH SECURITIES UNTIL SUCH CONDITIONS HAVE BEEN
          FULFILLED WITH RESPECT TO SUCH TRANSFER. A COPY OF SUCH
          CONDITIONS SHALL BE FURNISHED BY THE COMPANY TO THE HOLDER HEREOF
          UPON WRITTEN REQUEST AND WITHOUT CHARGE."

          Section 7C. CONSENT TO AMENDMENTS. Except as otherwise expressly
provided herein, the provisions of this Agreement may be amended and the Company
may take any action herein prohibited, or omit to perform any act herein
required to be performed by it, only if the Company has obtained the written
consent of the holders holding a majority of the Co-Invest Units purchased by
Purchaser hereunder at the Closing and the Majority Holders (as defined in the
Investor Purchase Agreement). No other course of dealing between the Company and
the holder of any Co-Invest Units or any delay in exercising any rights
hereunder or under the LLC Agreement shall operate as a waiver of any rights of
any such holders.

          Section 7D. SURVIVAL OF REPRESENTATIONS, WARRANTIES AND COVENANTS. All

                                      -12-
<Page>

representations, warranties and covenants contained herein or made in writing by
any party in connection herewith shall survive the execution and delivery of
this Agreement and the consummation of the transactions contemplated hereby,
regardless of any investigation made by Purchaser or on its behalf.

          Section 7E. SUCCESSORS AND ASSIGNS. Except as otherwise expressly
provided herein, all covenants and agreements contained in this Agreement by or
on behalf of any of the parties hereto shall bind and inure to the benefit of
the respective successors and assigns of the parties hereto whether so expressed
or not. In addition, and whether or not any express assignment has been made,
the provisions of this Agreement which are for Purchaser's benefit as a
purchaser or holder of Co-Invest Units are also for the benefit of, and
enforceable by, any subsequent holder of such Co-Invest Units.

          Section 7F. GENERALLY ACCEPTED ACCOUNTING PRINCIPLES. Where any
accounting determination or calculation is required to be made under this
Agreement or the exhibits hereto, such determination or calculation (unless
otherwise provided) shall be made in accordance with generally accepted
accounting principles, consistently applied, except that if because of a change
in generally accepted accounting principles the Company would have to alter a
previously utilized accounting method or policy in order to remain in compliance
with generally accepted accounting principles, such determination or calculation
shall continue to be made in accordance with the Company's previous accounting
methods and policies.

          Section 7G. SEVERABILITY. Whenever possible, each provision of this
Agreement shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement is held to be prohibited
by or invalid under applicable law, such provision shall be ineffective only to
the extent of such prohibition or invalidity, without invalidating the remainder
of this Agreement.

          Section 7H. COUNTERPARTS. This Agreement may be executed
simultaneously in two or more counterparts (including by means of telecopied
signature pages), any one of which need not contain the signatures of more than
one party, but all such counterparts taken together shall constitute one and the
same Agreement.

          Section 7I. DESCRIPTIVE HEADINGS; INTERPRETATION. The descriptive
headings of this Agreement are inserted for convenience only and do not
constitute a Section of this Agreement. The use of the word "including" in this
Agreement shall be by way of example rather than by limitation.

          Section 7J. GOVERNING LAW. All issues and questions concerning the
construction, validity, interpretation and enforcement of this Agreement and the
exhibits and schedules hereto shall be governed by, and construed in accordance
with, the laws of the State of Delaware, without giving effect to any choice of
law or conflict of law rules or provisions (whether of the State of Delaware or
any other jurisdiction) that would cause the application of the laws of any
jurisdiction other than the State of Delaware.

          Section 7K. NOTICES. All notices, demands or other communications to
be given or

                                      -13-
<Page>

delivered under or by reason of the provisions of this Agreement shall be in
writing and shall be deemed to have been given when delivered personally to the
recipient, sent to the recipient by reputable express courier service (charges
prepaid) or mailed to the recipient by certified or registered mail, return
receipt requested and postage prepaid. Such notices, demands and other
communications shall be sent to Purchaser and to the Company at the addresses
indicated below:

     IF TO THE COMPANY:

          IF TO THE COMPANY:

          TSI Telecommunication Holdings, LLC
          201 North Franklin Street
          Tampa, Florida 33602
          Attention: G. Edward Evans
          Telephone: (813) 273-3000
          Facsimile: (813) 273-4953

          AND

          TSI Telecommunication Holdings, LLC
          201 North Franklin Street
          Tampa, Florida 33602
          Attention: Robert Garcia, Jr.
          Telephone: (813) 273-3000
          Facsimile: (813) 273-4953

WITH COPIES TO THE INVESTORS, WHICH WILL NOT CONSTITUTE NOTICE TO THE COMPANY,
TO:

          GTCR Fund VII, L.P., GTCR Fund VII/A, L.P.
          and GTCR Co-Invest, L.P.
          c/o GTCR Golder Rauner, L.L.C.
          6100 Sears Tower
          Chicago, Illinois  60606-6402
          Attention:    David A. Donnini
                        Collin E. Roche
          Telephone: (312) 382-2200
          Facsimile: (312) 382-2201

          AND:

          Kirkland & Ellis
          200 East Randolph Drive

                                      -14-
<Page>

          Chicago, Illinois  60601
          Attention:    Stephen L. Ritchie
          Telephone: (312) 861-2210
          Facsimile: (312) 861-2200

          IF TO PURCHASER:

          Snowlake Investment Pte Ltd
          c/o GIC Special Investment Pte Ltd
          255 Shoreline Drive, Suite 600
          Redwood City, California 94065
          Attention: Brett Fisher
          Telephone: (650) 593-3100
          Facsimile: (650) 802-1213

          WITH A COPY TO:

          Snowlake Investment Pte Ltd
          c/o GIC Special Investment Pte Ltd
          156 West 56th Street
          New York, New York 10019
          Attention: Andrew Kwee
          Telephone: (212) 468-1900
          Facsimile: (212) 468-1901

          AND:

          Pillsbury Winthrop LLP
          50 Fremont Street
          San Francisco, California 94105
          Attention:    Gregg Vignos
          Telephone: (415) 983-1649
          Facsimile: (415) 982-1200

or to such other address or to the attention of such other person as the
recipient party has specified by prior written notice to the sending party.

          Section 7L. ENTIRE AGREEMENT. This Agreement, those documents
expressly referred to herein and other documents of even date herewith embody
the complete agreement and understanding among the parties and supersede and
preempt any prior understandings, agreements or representations by or among the
parties, written or oral, which may have related to the subject matter hereof in
any way.

                                      -15-

                                    * * * * *

<Page>

          IN WITNESS WHEREOF, the parties hereto have executed this Agreement on
the date first written above.

                       TSI TELECOMMUNICATION HOLDINGS, LLC

                       By:       /s/ G. Edward Evans

                       Name:     G. Edward Evans
                       Its:      Chief Executive Officer

                       PURCHASER

                       By:   /s/ Brett Fisher
                       Name:     Brett Fisher
                       Its:      Director

           SIGNATURE PAGE 1 OF 2 TO TSI / SINGAPORE PURCHASE AGREEMENT
<Page>

Agreed and Accepted:

GTCR FUND VII, L.P.

By:    GTCR Partners VII, L.P.
Its:   General Partner

By:    GTCR Golder Rauner, L.L.C.
Its:   General Partner

By:    /s/ David A. Donnini
Name:  David A. Donnini
Its:   Principal

GTCR FUND VII/A, L.P.

By:    GTCR Partners VII, L.P.
Its:   General Partner

By:    GTCR Golder Rauner, L.L.C.
Its:   General Partner

By:    /s/ David A. Donnini
Name:  David A. Donnini
Its:   Principal

GTCR CO-INVEST, L.P.

By:    GTCR Golder Rauner, L.L.C.
Its:   General Partner

By:    /s/ David A. Donnini
Name:  David A. Donnini
Its:   Principal

           SIGNATURE PAGE 2 OF 2 TO TSI / SINGAPORE PURCHASE AGREEMENT

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