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                                                                   EXHIBIT 10.20

                          CO-INVEST PURCHASE AGREEMENT

          THIS CO-INVEST 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 Project Networks
Partners LLC, a Delaware limited liability company (the "PURCHASER").

          The Company and Purchaser desire to enter into an agreement pursuant
to which Purchaser will purchase, and the Company will sell 158.35 Class B
Preferred Units of the Company (the "CLASS B PREFERRED") and 49,602.54 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". Certain definitions are set forth in SECTION 8 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:

          1.   PURCHASE AND SALE OF CO-INVEST UNITS.

          (a)  Upon execution of this Agreement, Purchaser will purchase, and
the Company will sell, 49,602.54 Common Units at a price of $0.0333 per unit,
and 158.35 units of Class B Preferred at a price of $1,000 per unit. Purchaser
further agrees that in connection with the transactions contemplated by this
Agreement, Purchaser will execute and deliver to the Company, this Agreement,
the Securityholders Agreement, the Registration Agreement and the LLC Agreement
and each of the other agreements contemplated hereby or thereby and make the
investment in the Company described herein. The Company will deliver to
Purchaser copies of the certificates representing the Common Units and Class B
Preferred purchased by Purchaser, and Purchaser will deliver to the Company a
cashier's or certified check or wire transfer of immediately available funds in
the aggregate amount equal to the aggregate purchase price for the Class B
Preferred and Common Units being purchased by Purchaser.

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          (b)  Upon the purchase from time to time by the Investors of
Securities (as defined in the Investor Purchase Agreement) of the Company
pursuant to SECTION 1B(ii) of the Investor Purchase Agreement, Purchaser will
purchase, and the Company will sell, (i) units of Class B Preferred, (ii) Common
Units or (iii) any combination of such Securities at the same prices and in the
same proportions as the Investors purchase (each such purchase, a "SUBSEQUENT
CLOSING"). The amount to be invested by Purchaser at any Subsequent Closing
shall equal the result of (i) the amount being invested by the Investors in
connection with such Subsequent Closing DIVIDED BY $244,687,059 MULTIPLIED BY
(ii) $175,686; PROVIDED that without Purchaser's prior consent the aggregate
amount required to be invested by Purchaser pursuant to SECTIONS 1(a) and (b)
shall not at any time exceed $175,686. The Company will deliver to Purchaser
copies of the certificates representing such Securities purchased by Purchaser,
and Purchaser will deliver to the Company a cashier's or certified check or wire
transfer of immediately available funds in the aggregate amount equal to the
price per unit of such Class B Preferred or Common Unit MULTIPLIED BY the number
of such units so purchased by Purchaser at such Subsequent Closing.

          (c)  In connection with the purchase and sale of the Co-Invest Units,
Purchaser represents and warrants to the Company that:

               (i) The Co-Invest Units to be acquired by Purchaser pursuant to
     this Agreement will be acquired for Purchaser's own account and not with a
     view to, or intention of, distribution thereof in violation of the
     Securities Act, or any applicable state securities laws, and the Co-Invest
     Units will not be disposed of in contravention of the Securities Act or any
     applicable state securities laws.

               (ii)  Purchaser is sophisticated in financial matters and is able
     to evaluate the risks and benefits of the investment in the Co-Invest
     Units.

               (iii) Purchaser is able to bear the economic risk of its
     investment in the Co-Invest Units for an indefinite period of time because
     the Co-Invest Units have not been registered under the Securities Act and,
     therefore, cannot be sold unless subsequently registered under the
     Securities Act or an exemption from such registration is available.

               (iv)  Purchaser has had an opportunity to ask questions and
     receive answers concerning the terms and conditions of the offering of
     Co-Invest Units and has had full access to such other information
     concerning the Company as it has requested.

               (v)   Purchaser 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 Purchaser. Purchaser has all requisite limited liability
     company 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 copy of
     Purchaser's Limited Liability Company Agreement which

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     has been furnished to the Investors' counsel reflect all amendments made
     thereto at any time prior to the date of this Agreement and are correct and
     complete. Schedule A attached to Purchaser's Limited Liability Company
     Agreement contains a complete and correct list of the names and addresses
     of all of the members of Purchaser, and sets forth the respective capital
     contributions, unit ownership and states of residency of each member.

               (vi)  The execution, delivery and performance of this Agreement,
     the Securityholders Agreement, the Registration Agreement, the LLC
     Agreement and all other agreements contemplated hereby to which Purchaser
     is a party has been duly authorized by Purchaser. This Agreement, the
     Securityholders Agreement, the Registration Agreement, the LLC Agreement
     and all other agreements contemplated hereby each constitutes a valid and
     binding obligation of Purchaser, enforceable against Purchaser in
     accordance with its terms. The execution and delivery by Purchaser of this
     Agreement, the Securityholders Agreement, the Registration Agreement, the
     LLC Agreement and all other agreements contemplated hereby to which
     Purchaser is a party and the fulfillment of and compliance with the
     respective terms hereof and thereof by Purchaser 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 Purchaser's membership
     units 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, Purchaser's Limited Liability Company Agreement or any law,
     statute, rule or regulation to which Purchaser is subject, or any
     agreement, instrument, order, judgment or decree to which the Purchaser is
     a party or by which it is bound.

               (vii) Each of the members of Purchaser is an accredited investor
     as such term is defined in the Securities Act and the rules and regulations
     promulgated thereunder.

          2.   COVENANTS.

          (a)  Concurrently with the execution of this Agreement, Purchaser
shall execute in blank ten security transfer powers in the form of Exhibit A
attached hereto (the "Security Powers") with respect to the Co-Invest Units and
shall deliver such Security Powers to the Company. The Security Powers shall
authorize the Company to assign, transfer and deliver the Co-Invest Units to the
appropriate acquiror thereof pursuant to Section 3 below and Section 6 of the
Securityholders Agreement and under no other circumstances.

          (b)  Purchaser has no reason to believe that its members lack the
financial resources necessary to fund their obligations under this Agreement or
any other agreement or instrument executed and delivered by Purchaser in
connection with the transactions contemplated herein or therein.

          3.   REPURCHASE OPTION.

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          (a)  If at any time Purchaser fails to purchase any of the Securities
it is required to purchase pursuant to SECTION 1(b) above (a "TRIGGERING
EVENT"), the Investors shall have the option to repurchase (the "REPURCHASE
OPTION") the Common Units purchased by such Purchaser pursuant to this Agreement
(whether held by Purchaser or one or more of Purchaser's transferees, other than
the Company and Investors), pursuant to the terms, conditions and procedures set
forth in SECTIONS 3(b), (c) and (d) below.

          (b)  Upon a Triggering Event, the number of Common Units subject to
the Repurchase Option at any time (the "REPURCHASE UNITS") shall be equal to (i)
1 MINUS a fraction, the numerator of which shall be the amount actually invested
by Purchaser in connection with a Subsequent Closing, and the denominator of
which shall be the amount required to be invested by Purchaser pursuant to
SECTION 1(b) at such Subsequent Closing MULTIPLIED BY (ii) the aggregate number
of Common Units purchased by Purchaser as of the applicable Triggering Event (as
adjusted for unit splits, dividends, recapitalizations and similar
transactions). The purchase price for each Common Unit will be the Purchaser's
Original Cost for such unit.

          (c)  The Investors may elect to purchase any or all of the Repurchase
Units by delivering written notice to the holders of the Repurchase Units and
the Company within 60 days of the Triggering Event.

          (d)  Within 90 days of the Triggering Event, the Company shall provide
the Investors and each holder of the Repurchase Units with written notice
specifying the number of units being purchased by the Investors from each
holder, the aggregate purchase price and the time and place of the closing of
the transaction (which date shall not be more than 30 days or less than 5 days
after delivery of such notice).

          (e)  The Investors will pay for the Repurchase Units to be purchased
by them pursuant to this SECTION 3 by first offsetting amounts outstanding under
any bona fide debts owed by the holder of the Repurchase Units to any of the
Investors. Each Investor will pay for the Repurchase Units to be purchased by it
by a check or wire transfer of funds after offsetting any bona fide debts owed
by the holder of the Repurchase Units to any of the Investors.

          (f)  Upon a Triggering Event, Purchaser's future right to purchase
Securities pursuant to SECTION 1(b) above, and its right of first refusal set
forth in SECTION 4 of the Securityholders Agreement, shall terminate
immediately.

          4.   RESTRICTIONS ON AMENDMENT OF LIMITED LIABILITY COMPANY AGREEMENT.
Purchaser shall not amend, restate, modify or waive any provision of its Limited
Liability Company Agreement without the prior written consent of GTCR Fund VII.
Purchaser shall enforce the provisions of its Limited Liability Company
Agreement and shall exercise all of its rights and remedies thereunder
(including any restrictions on transfers of units) unless it is otherwise
directed in writing by GTCR Fund VII.

          5.   RESTRICTIONS ON TRANSFER OF CO-INVEST UNITS.

          (a)  LEGEND. The certificates representing the Co-Invest Units will
bear a legend in substantially the following form:

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     "THE SECURITIES REPRESENTED BY THIS CERTIFICATE WERE ORIGINALLY ISSUED
     AS OF FEBRUARY 14, 2002, HAVE NOT BEEN REGISTERED UNDER THE SECURITIES
     ACT OF 1933, AS AMENDED (THE "ACT"), AND MAY NOT BE SOLD OR
     TRANSFERRED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT
     UNDER THE ACT OR AN EXEMPTION FROM REGISTRATION THEREUNDER. THE
     SECURITIES REPRESENTED BY THIS CERTIFICATE ARE ALSO SUBJECT TO
     ADDITIONAL RESTRICTIONS ON TRANSFER, CERTAIN REPURCHASE OPTIONS AND
     CERTAIN OTHER AGREEMENTS SET FORTH IN A CO-INVEST PURCHASE AGREEMENT
     BETWEEN THE COMPANY AND A MEMBER OF THE COMPANY DATED AS OF FEBRUARY
     14, 2002. A COPY OF SUCH AGREEMENT MAY BE OBTAINED BY THE HOLDER
     HEREOF AT THE COMPANY'S PRINCIPAL PLACE OF BUSINESS WITHOUT CHARGE."

          (b)  OPINION OF COUNSEL. No holder of any Co-Invest Units may Transfer
any Co-Invest Units (except pursuant to a Public Sale) without first delivering
to the Company a written notice describing in reasonable detail the proposed
Transfer, together with, if requested by the Company, an opinion of counsel
(reasonably acceptable in form and substance to the Company) that neither
registration nor qualification under the Securities Act and applicable state
securities laws is required in connection with such transfer. In addition, if
the holder of the Co-Invest Units delivers to the Company an opinion of counsel
that no subsequent Transfer of such Co-Invest Units shall require registration
under the Securities Act, the Company shall promptly upon such contemplated
Transfer deliver new certificates for such Co-Invest Units which do not bear the
Securities Act portion of the legend set forth in SECTION 5(a); PROVIDED that an
opinion of counsel shall not be required in connection with a Transfer of
Co-Invest Units pursuant to a Public Sale. If the Company is not required to
deliver new certificates for such Co-Invest Units 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 5.

          6.   DEFINITIONS.

          "AFFILIATE" means, (i) with respect to any Person, any Person that
controls, is controlled by or is under common control with such Person or an
Affiliate of such Person, and (ii) with respect to any Investor, any general or
limited partner of such Investor or any other person, entity or investment fund
controlling, controlled by or under common control with such Investor.

          "CO-INVEST UNITS" will continue to be Co-Invest Units in the hands of
any holder other than Purchaser (except for the Company and the Investors and
except for transferees in a Public Sale), and except as otherwise provided
herein, each such other holder of Co-Invest Units will succeed to all rights and
obligations attributable to Purchaser as a holder of Co-Invest Units hereunder.
Co-Invest Units will also include equity of the Company (or a corporate
successor to the Company) issued with respect to Co-Invest Units (i) by way of a
unit split, unit dividend, conversion, or other recapitalization or (ii) by way
of reorganization or recapitalization of the

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Company in connection with the incorporation of a corporate successor prior to a
Public Offering.

          LLC AGREEMENT" means the Limited Liability Company Agreement of the
Company, dated February 14, 2002, among those Persons who from time to time are
parties thereto, as the same may be amended from time to time pursuant to the
terms thereof.

          "ORIGINAL COST" means, with respect to each Common Unit purchased
hereunder, $0.333 (as proportionately adjusted for all subsequent unit splits,
unit dividends and other recapitalizations).

          "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 an underwritten public offering
registered under the Securities Act of equity securities of the Company or a
corporate successor to the Company.

          "PUBLIC SALE" means (i) any sale pursuant to a registered public
offering under the Securities Act or (ii) any sale to the public pursuant to
Rule 144 promulgated under the Securities Act effected through a broker, dealer
or market maker (other than pursuant to Rule 144(k) prior to a Public Offering).

          "REGISTRATION AGREEMENT" means the Registration Agreement, dated as of
the date hereof, by and among the Company, the Investors (or an Affiliate
thereof) and the other Persons party thereto from time to time, as the same may
be amended from time to time pursuant to the terms thereof.

          "SECURITIES ACT" means the Securities Act of 1933, as amended from
time to time.

          "SECURITYHOLDERS AGREEMENT" means the Securityholders Agreement of
even date herewith among the Company and certain of its securityholders, as the
same may be amended from time to time pursuant to the terms thereof.

          "TRANSFER" means to sell, transfer, assign, pledge or otherwise
dispose of (whether with or without consideration and whether voluntarily or
involuntarily or by operation of law).

          7. NOTICES. Any notice provided for in this Agreement must be in
     writing and must be either personally delivered, mailed by first class mail
     (postage prepaid and return receipt requested) or sent by reputable
     overnight courier service (charges prepaid) to the recipient at the address
     below indicated:

          IF TO THE COMPANY:

               TSI Telecommunication Holdings, LLC
               201 North Franklin Street

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               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:

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

          IF TO PURCHASER:

               Project Network Partners LLC
               c/o Jeffrey Seaman
               1315 Ashbury Avenue
               Winnetka, Illinois 60093
               Facsimile: (312) 609-8562

          WITH A COPIES TO:

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               Project Network Partners LLC
               c/o Raj Shah
               350 West 50th Street, Apt. 27E
               New York, New York 10019
               Facsimile: (212) 758-4420

               AND:

               Latham & Watkins
               885 Third Avenue
               New York, New York 10022
               Attention: Kirk A. Davenport
               Telephone: (212) 906-1200
               Facsimile: (212) 751-4864

          IF TO THE INVESTORS:

               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

          WITH A COPY TO:

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

or such other address or to the attention of such other person as the recipient
party shall have specified by prior written notice to the sending party. Any
notice under this Agreement will be deemed to have been given when so delivered
or sent or, if mailed, five days after deposit in the U.S. mail.

          8.   GENERAL PROVISIONS.

          (a)  TRANSFERS IN VIOLATION OF AGREEMENT. Any Transfer or attempted
Transfer of any Co-Invest Units in violation of any provision of this Agreement
shall be void, and the

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Company shall not record such Transfer on its books or treat any purported
transferee of such Co-Invest Units as the owner of such equity for any purpose.

          (b)  SEVERABILITY. Whenever possible, each provision of this Agreement
will 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 invalid, illegal or
unenforceable in any respect under any applicable law or rule in any
jurisdiction, such invalidity, illegality or unenforceability will not affect
any other provision or any other jurisdiction, but this Agreement will be
reformed, construed and enforced in such jurisdiction as if such invalid,
illegal or unenforceable provision had never been contained herein.

          (c)  COMPLETE 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.

          (d)  COUNTERPARTS. This Agreement may be executed in separate
counterparts, each of which is deemed to be an original and all of which taken
together constitute one and the same agreement.

          (e)  SUCCESSORS AND ASSIGNS. Except as otherwise provided herein, this
Agreement shall bind and inure to the benefit of and be enforceable by
Purchaser, the Company, the Investors and their respective successors and
assigns (including subsequent holders of Co-Invest Units); PROVIDED that the
rights and obligations of Purchaser under this Agreement shall not be assignable
except in connection with a permitted transfer of Co-Invest Units hereunder.

          (f)  CHOICE OF LAW. The law of the State of Delaware will govern all
questions concerning the relative rights of the Company and its members. All
other questions concerning the construction, validity and interpretation of this
Agreement will 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.

          (g)  REMEDIES. Each of the parties to this Agreement (including the
Investors) will be entitled to enforce its rights under this Agreement
specifically, to recover damages and costs (including attorney's fees) caused by
any breach of any provision of this Agreement and to exercise all other rights
existing in its favor.

          (h)  AMENDMENT AND WAIVER. The provisions of this Agreement may be
amended and waived only with the prior written consent of the Company, the
members of Purchaser holding a majority of the Co-Invest Units held by
Purchaser, and the Majority Holders (as defined in the Investor Purchase
Agreement).

          (i)  BUSINESS DAYS. If any time period for giving notice or taking
action hereunder expires on a day which is a Saturday, Sunday or holiday in the
state in which the

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Company's chief executive office is located, the time period shall be
automatically extended to the business day immediately following such Saturday,
Sunday or holiday.

          (j)  ADJUSTMENTS OF NUMBERS. All numbers set forth herein which refer
to unit prices or amounts will be appropriately adjusted to reflect unit splits,
unit dividends, combinations of units and other recapitalizations affecting the
subject class of equity.

          (k)  LLC AGREEMENT. Purchaser hereby irrevocably waives any right he
may have under Section 18-305 of the Delaware Limited Liability Company Act.

          (l)  DEEMED TRANSFER OF COMMON UNITS. If the Investors and/or any
other Person acquiring securities shall make available, at the time and place
and in the amount and form provided in this Agreement, the consideration for the
Co-Invest Units to be repurchased in accordance with the provisions of this
Agreement, then from and after such time, the Person from whom such units are to
be repurchased shall no longer have any rights as a holder of such units (other
than the right to receive payment of such consideration in accordance with this
Agreement), and such units shall be deemed purchased in accordance with the
applicable provisions hereof and the Investors and/or any other Person acquiring
securities shall be deemed the owner and holder of such units, whether or not
the certificates therefor have been delivered as required by this Agreement.

          (m)  RIGHTS GRANTED TO GTCR AND ITS AFFILIATES. Any rights granted to
GTCR VII, GTCR VII/A, GTCR Co-Invest and their Affiliates hereunder may also be
exercised (in whole or in part) by their designees (which may be Affiliates of
GTCR Fund VII, GTCR Fund VII/A and/or GTCR Co-Invest).

                                  * * * * * * *

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

                                            TSI TELECOMMUNICATION
                                            HOLDINGS, LLC

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

                                            PROJECT NETWORK PARTNERS LLC

                                            By:  /s/ Rajesh Shah
                                            Name:  Rajesh Shah
                                            Its: Treasurer

                  SIGNATURE PAGES TO LEHMAN PURCHASE AGREEMENT
                                   PAGE 1 OF 2
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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 PAGES TO LEHMAN PURCHASE AGREEMENT
                                   PAGE 2 OF 2<Page>

                                                                   EXHIBIT 10.21

                               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 Christian Schiller, Arnis Kins and John
Kins (Christian Schiller, Arnis Kins and John Kins are referred to herein
individually as a "PURCHASER", and collectively, as the "PURCHASERS"). Except as
otherwise indicated herein, capitalized terms used herein are defined in SECTION
6 of this Agreement.

          The parties hereto agree as follows:

          1.  PURCHASE AND SALE OF COMMON UNITS.

          (a) Upon the execution of this Agreement, the Purchasers will
purchase, and the Company will sell 225,225.23 of the Company's Common Units
(the "COMMON UNITS") at a price of $0.0333 per unit. Each Purchaser shall
purchase the amount of Common Units set forth next to such Purchaser's name on
SCHEDULE A attached hereto. Each Purchaser further agrees that in connection
with the transactions contemplated by this Agreement, such Purchaser will
execute and deliver to the Company, this Agreement, the Securityholders
Agreement, the Registration Agreement and the LLC Agreement and each of the
other agreements contemplated hereby or thereby and make the investment in the
Company described herein. The Company will deliver the Purchasers copies of the
certificates representing such Common Units purchased by each Purchaser, and
each Purchaser will deliver to the Company a cashier's or certified check or
wire transfer of funds in the aggregate amount of $2,500 as payment for the
Common Units purchased by such Purchaser. The Common Units acquired by
Purchasers pursuant to this SECTION 1(a) are referred to herein as "CARRIED
UNITS".

          (b) Within 30 days after the purchase of any Carried Units hereunder,
each Purchaser will make an effective election with the Internal Revenue Service
under Section 83(b) of the Internal Revenue Code and the regulations promulgated
thereunder in the form of EXHIBIT A attached hereto.

          (c) In connection with the purchase and sale of the Carried Units,
each Purchaser represents and warrants to the Company that:

              (i) The Carried Units to be acquired by such Purchaser pursuant to
     this Agreement will be acquired for such Purchaser's own account and not
     with a view to, or intention of, distribution thereof in violation of the
     Securities Act, or any applicable state securities laws, and the Carried
     Units will not be disposed of in contravention of the Securities Act or any
     applicable state securities laws.

              (ii) Such Purchaser is sophisticated in financial matters and is
     able to evaluate the risks and benefits of the investment in the Carried
     Units.

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              (iii) Such Purchaser is able to bear the economic risk of his
     investment in the Carried Units for an indefinite period of time because
     the Carried Units have not been registered under the Securities Act and,
     therefore, cannot be sold unless subsequently registered under the
     Securities Act or an exemption from such registration is available.

              (iv) Such Purchaser has had an opportunity to ask questions and
     receive answers concerning the terms and conditions of the offering of the
     Carried Units and has had full access to such other information concerning
     the Company and its Subsidiaries as he has requested.

              (v) This Agreement, the Securityholders Agreement, the
     Registration Agreement and the LLC Agreement, and all other agreements
     contemplated hereby or thereby to which such Purchaser is a party
     constitutes a legal, valid and binding obligation of such Purchaser,
     enforceable against such Purchaser in accordance with its terms, and the
     execution, delivery and performance of this Agreement the Securityholders
     Agreement, the Registration Agreement and the LLC Agreement, and all other
     agreements contemplated hereby or thereby by such Purchaser does not and
     will not conflict with, violate or cause a breach of any agreement,
     contract or instrument to which such Purchaser is a party or any judgment,
     order or decree to which such Purchaser is subject.

              (vi)  Such Purchaser is a resident of the State of Illinois.

              (vii) Such Purchaser is an accredited investor as such term is
     defined in the Securities Act and the rules and regulations promulgated
     thereunder.

              (viii) Such Purchaser acknowledges and agrees that certain
     provisions of this Agreement are intended for the benefit of, and will be
     enforceable by, the Investors.

          2. COVENANTS. Concurrently with the execution of this Agreement, each
Purchaser shall execute in blank ten security transfer powers in the form of
EXHIBIT B attached hereto (the "SECURITY POWERS") with respect to the Carried
Units and shall deliver such Security Powers to the Company. The Security Powers
shall authorize the Company to assign, transfer and deliver the Carried Units to
the appropriate acquiror thereof pursuant to SECTION 4 below or SECTION 6 of the
Securityholders Agreement and under no other circumstances.

          3.  VESTING OF CARRIED UNITS.

          (a) The Carried Units shall be subject to vesting in the manner
specified in this SECTION 3. Except as otherwise provided in SECTION 3(b) below,
5% of the Carried Units will become vested on each Quarter Date such that on
February 14, 2007 the Carried Units will be 100% vested, in each case, however,
if and only if as of each such Quarter Date, G. Edward Evans has been
continuously employed by the Company, Employer or any of their respective
Subsidiaries from the date of this Agreement through and including such Quarter
Date.

          (b) Upon the occurrence of a Sale of the Company, all Carried Units
which have not yet become vested shall become vested at the time of such event,
if as of the date of

                                        2
<Page>

such event G. Edward Evans is employed by the Company, Employer or any of their
respective Subsidiaries. Carried Units which have become vested are referred to
herein as "VESTED UNITS" and all other Carried Units are referred to herein as
"UNVESTED UNITS."

          4.  REPURCHASE OPTION.

          (a) Upon G. Edward Evans (the "EXECUTIVE") ceasing to be employed by
the Company, Employer or their respective Subsidiaries for any reason prior to
February 14, 2007 (the "TRIGGERING EVENT"), the Carried Units (whether held by
the Purchasers or one or more of the Purchasers' transferees, other than the
Company and the Investors) will be subject to repurchase, by the Company
pursuant to the terms and conditions set forth in this SECTION 4 (the
"REPURCHASE OPTION"). The Company may assign its repurchase rights set forth in
this SECTION 3 to any Person; PROVIDED that the Company may not assign to any
Person its right to pay any portion of the Repurchase Price for Carried Units
repurchased hereunder in the form of Class A Preferred, as set forth in SECTION
4(e).

          (b) Upon the Triggering Event: (i) the purchase price for each
Unvested Unit will be the lesser of (A) such Purchaser's Original Cost for such
Unit and (B) the Fair Market Value of such unit as of the date of the Triggering
Event; and (ii) the purchase price for each Vested Unit will be the Fair Market
Value of such unit as of the date of the Triggering Event; PROVIDED, however,
that if Executive's employment is terminated for Cause (as defined in the Senior
Management Agreement), the purchase price for each Vested Common Unit will be
Purchaser's Original Cost for such Common Unit.

          (c) The Board may elect to purchase all or any portion of the Unvested
Units or the Vested Units by delivering written notice (the "REPURCHASE NOTICE")
to the holder or holders of the Carried Units within one year after the
Triggering Event. The Repurchase Notice will set forth the number of Unvested
Units and Vested Units to be acquired from each holder, the aggregate
consideration to be paid for such units and the time and place for the closing
of the transaction. The number of Carried Units to be repurchased by the Company
shall first be satisfied to the extent possible from the Carried Units held by
the Purchasers at the time of delivery of the Repurchase Notice. If the number
of Carried Units then held by the Purchasers is less than the total number of
Carried Units which the Company has elected to purchase, the Company shall
purchase the remaining Carried Units elected to be purchased from the other
holder(s) of Carried Units under this Agreement, pro rata according to the
number of Carried Units held by such other holder(s) at the time of delivery of
such Repurchase Notice (determined as nearly as practicable to the nearest
unit). The number of Unvested Units and Vested Units to be repurchased hereunder
will be allocated among the Purchasers and the other holders of Carried Units
(if any) pro rata according to the number of Carried Units to be purchased from
such Person.

          (d) The closing of the purchase of the Carried Units pursuant to the
Repurchase Option shall take place on the date designated by the Company in the
Repurchase Notice, which date shall not be more than one month nor less than
five days after the delivery of the later of either such notice to be delivered.
The Company will pay for the Carried Units to be purchased by it pursuant to the
Repurchase Option by first offsetting amounts outstanding under any bona fide
debts owed by the Purchasers to the Company and will pay the remainder of the

                                        3
<Page>

purchase price by, at its option, (A) a check or wire transfer of funds, (B)
issuing in exchange for such securities a number of the Company's Class A
Preferred (having the rights and preferences set forth in the LLC Agreement)
equal to (x) the aggregate portion of the repurchase price for such Carried
Units to be paid by the issuance of Class A Preferred divided by (y) 1,000, and
for purposes of the LLC Agreement each such Class A Preferred unit shall as of
its issuance be deemed to have Capital Contributions (as defined in the LLC
Agreement) made with respect to such Class A Preferred unit equal to $1,000, or
(C) any combination of (A) and (B) as the Board may elect in its discretion. The
Company will be entitled to receive customary representations and warranties
from the sellers regarding such sale and to require that all sellers' signatures
be guaranteed.

          By way of example only for the purpose of clarifying the mechanics of
SECTION 4(e)(B), if the Company intends to repurchase 45,045 Carried Units from
a Purchaser by issuance of Class A Preferred and the aggregate repurchase price
determined in accordance with this SECTION 3 is $1,500, then the Company would
issue such Purchaser 1.5 units of Class A Preferred and for purposes of the LLC
Agreement the whole unit of Class A Preferred issued to such Purchaser would as
of its issuance be deemed to have Capital Contributions made for such Class A
Preferred of $1,000 and the Capital Contributions made for the one-half unit of
Class A Preferred would be $500.

          (e) Notwithstanding anything to the contrary contained in this
Agreement, all repurchases of Carried Units by the Company pursuant to the
Repurchase Option shall be subject to applicable restrictions contained in the
Delaware Limited Liability Company Act, the Delaware General Corporation Law or
such other governing corporate law, and in the Company's and its Subsidiaries'
debt and equity financing agreements. If any such restrictions prohibit (i) the
repurchase of Carried Units hereunder which the Company is otherwise entitled to
make or (ii) dividends or other transfers of funds from one or more Subsidiaries
to the Company to enable such repurchases, then the Company may make such
repurchases as soon as it is permitted to make repurchases or receive funds from
Subsidiaries under such restrictions.

          (f) Notwithstanding anything to the contrary contained in this
Agreement, if the Fair Market Value of the Carried Units is finally determined
to be an amount at least 10% greater than the per unit repurchase price for such
Carried Units in the Repurchase Notice, the Company shall have the right to
revoke its exercise of the Repurchase Option for all or any portion of the
Carried Units elected to be repurchased by it by delivering notice of such
revocation in writing to the holders of Carried Units during the thirty-day
period beginning on the date that the Company is given written notice that the
Fair Market Value of Carried Units was finally determined to be an amount at
least 10% greater than the per unit repurchase price for Carried Units set forth
in the Repurchase Notice.

          (g) The provisions of this SECTION 4 shall terminate with respect to
Vested Units upon the first to occur of the consummation of a Public Offering
and the consummation of a Sale of the Company.

          5.  RESTRICTIONS ON TRANSFER OF CARRIED UNITS.

          (a) LEGEND. The certificates representing the Carried Units will bear
a legend

                                        4
<Page>

 in substantially the following form:

          "THE SECURITIES REPRESENTED BY THIS CERTIFICATE WERE ORIGINALLY ISSUED
          AS OF FEBRUARY 14, 2002, HAVE NOT BEEN REGISTERED UNDER THE SECURITIES
          ACT OF 1933, AS AMENDED (THE "ACT"), AND MAY NOT BE SOLD OR
          TRANSFERRED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT
          UNDER THE ACT OR AN EXEMPTION FROM REGISTRATION THEREUNDER. THE
          SECURITIES REPRESENTED BY THIS CERTIFICATE ARE ALSO SUBJECT TO
          ADDITIONAL RESTRICTIONS ON TRANSFER, CERTAIN REPURCHASE OPTIONS AND
          CERTAIN OTHER AGREEMENTS SET FORTH IN A PURCHSE AGREEMENT BETWEEN THE
          COMPANY AND A MEMBER OF THE COMPANY DATED AS OF FEBRUARY 14, 2002. A
          COPY OF SUCH AGREEMENT MAY BE OBTAINED BY THE HOLDER HEREOF AT THE
          COMPANY'S PRINCIPAL PLACE OF BUSINESS WITHOUT CHARGE."

          (b) OPINION OF COUNSEL. No holder of Carried Units may sell, transfer
or dispose of any Carried Units (except pursuant to an effective registration
statement under the Securities Act) without first delivering to the Company a
written notice describing in reasonable detail the proposed transfer, together
with an opinion of counsel (reasonably acceptable in form and substance to the
Company) that neither registration nor qualification under the Securities Act
and applicable state securities laws is required in connection with such
transfer. In addition, if the holder of the Carried Units delivers to the
Company an opinion of counsel that no subsequent transfer of such Carried Units
shall require registration under the Securities Act, the Company shall promptly
upon such contemplated transfer deliver new certificates for such Carried Units
which do not bear the Securities Act portion of the legend set forth in SECTION
5(a). If the Company is not required to deliver new certificates for such
Carried Units 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 5.

          6.  DEFINITIONS.

          "AFFILIATE" means, (i) with respect to any Person, any Person that
controls, is controlled by or is under common control with such Person or an
Affiliate of such Person, and (ii) with respect to any Investor, any general or
limited partner of such Investor or any other person, entity or investment fund
controlling, controlled by or under common control with such Investor.

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

          "EMPLOYER" means TSI Telecommunication Services Inc., a Delaware
corporation, as successor to TSI Merger Sub, Inc, a Delaware corporation.

                                        5
<Page>

          "FAIR MARKET VALUE" of Carried Units means the average of the closing
prices of the sales of such Carried Units on all securities exchanges on which
such Carried Units may at the time be listed, or, if there have been no sales on
any such exchange on any day, the average of the highest bid and lowest asked
prices on all such exchanges at the end of such day, or, if on any day such
Carried Units is not so listed, the average of the representative bid and asked
prices quoted in the NASDAQ System as of 4:00 P.M., New York time, or, if on any
day such Carried Units are not quoted in the NASDAQ System, the average of the
highest bid and lowest asked prices on such day in the domestic over-the-counter
market as reported by the National Quotation Bureau Incorporated, or any similar
successor organization, in each such case averaged over a period of 21 days
consisting of the day as of which the Fair Market Value is being determined and
the 20 consecutive business days prior to such day. If at any time such Carried
Units are not listed on any securities exchange or quoted in the NASDAQ System
or the over-the-counter market, the Fair Market Value will be the fair value of
such Carried Units as determined in good faith by the Board. If the Purchasers
holding a majority of the Carried Units held by Purchasers reasonably disagree
with such determination, such Purchasers shall deliver to the Board a written
notice of objection within ten days after delivery of the Repurchase Notice.
Upon receipt of such Purchasers' written notice of objection, the Board and such
Purchasers will negotiate in good faith to agree on such Fair Market Value. If
such agreement is not reached within 30 days after the delivery of the
Repurchase Notice, Fair Market Value shall be determined by an appraiser jointly
selected by the Board and such Purchasers, which appraiser shall submit to the
Board and such Purchasers a report within 30 days of its engagement setting
forth such determination. If the parties are unable to agree on an appraiser
within 45 days after delivery of the Repurchase Notice, within seven days, each
party shall submit the names of four nationally recognized firms that are
engaged in the business of valuing non-public securities, and each party shall
be entitled to strike two names from the other party's list of firms, and the
appraiser shall be selected by lot from the remaining four firms. The expenses
of such appraiser shall be borne by such Purchasers unless the appraiser's
valuation is more than 10% greater than the amount determined by the Board, in
which case, the expenses of the appraiser shall be borne by the Company. The
determination of such appraiser as to Fair Market Value shall be final and
binding upon all parties.

          "INVESTORS" shall mean GTCR Fund VII, L.P., a Delaware limited
partnership, GTCR Fund VII/A, L.P., a Delaware limited partnership, GTCR
Co-Invest, L.P., a Delaware limited partnership and any other investment fund
managed by GTCR Golder Rauner, L.L.C.

          "INVESTOR PURCHASE AGREEMENT" means that certain Unit Purchase
Agreement dated as of the date hereof by and between the Investors and the
Company, as the same may be amended from time to time pursuant to the terms
thereof.

          "LLC AGREEMENT" means the Limited Liability Company Agreement of the
Company, dated as of the date hereof among the parties from time to time party
thereto, as the same may be amended from time to time pursuant to the terms
thereof.

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

                                        6
<Page>

          "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 an underwritten public offering
registered under the Securities Act of equity securities of the Company or a
corporate successor to the Company.

          "PUBLIC SALE" means (i) any sale pursuant to a registered public
offering under the Securities Act or (ii) any sale to the public pursuant to
Rule 144 promulgated under the Securities Act effected through a broker, dealer
or market maker (other than pursuant to Rule 144(k) prior to a Public Offering).

          "QUARTER DATE" means February, May, August and November of each year
beginning on May, 2002 and ending on February, 2007.

          "REGISTRATION AGREEMENT" means the Registration Agreement, dated as of
the date hereof, by and among the Company, the Investors (or an Affiliate
thereof) and the other Persons party thereto from time to time, as the same may
be amended from time to time pursuant to the terms thereof.

          "SALE OF THE COMPANY" means any transaction or series of transactions
pursuant to which any Person or group of related Persons other than the
Investors or their Affiliates in the aggregate acquire(s) (i) equity securities
of the Company possessing the voting power (other than voting rights accruing
only in the event of a default, breach or event of noncompliance) to elect a
majority of the Company's board of managers (whether by merger, consolidation,
reorganization, combination, sale or transfer of the Company's equity,
securityholder or voting agreement, proxy, power of attorney or otherwise) or
(ii) all or substantially all of the Company's assets determined on a
consolidated basis; PROVIDED that a Public Offering shall not constitute a Sale
of the Company.

          "SECURITIES ACT" means the Securities Act of 1933, as amended from
time to time.

          "SECURITYHOLDERS AGREEMENT" means the Securityholders Agreement dated
as of February 14, 2002 among the Company and certain of its securityholders, as
the same may be amended from time to time pursuant to the terms thereof.

          "SENIOR MANAGEMENT AGREEMENT" means that certain Senior Management
Agreement dated as of the date hereof, by and among the Company, Employer and G.
Edward Evans, as the same may be amended, modified or supplemented from time to
time.

          "SUBSIDIARY" means any corporation or other entity of which the
Company owns securities having a majority of the ordinary voting power in
electing the board of directors directly or through one or more subsidiaries.

          "TRANSFER" means to sell, transfer, assign, pledge or otherwise
dispose of (whether with or without consideration and whether voluntarily or
involuntarily or by operation of law).

                                        7
<Page>

          7. NOTICES. Any notice provided for in this Agreement must be in
writing and must be either personally delivered, mailed by first class mail
(postage prepaid and return receipt requested) or sent by reputable overnight
courier service (charges prepaid) to the recipient at the address below
indicated:

          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:

              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

              WITH COPIES TO:

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

                                        8
<Page>

          IF TO PURCHASER:

              Christian Schiller
              c/o Cook Associates, Inc.
              212 West Kinzie Street
              Chicago, Illinois 60610
              Telephone: (312) 755-5633
              Facsimile: (312) 329-1528

          IF TO THE INVESTORS:

              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

          WITH A COPY TO:

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

or such other address or to the attention of such other person as the recipient
party shall have specified by prior written notice to the sending party. Any
notice under this Agreement will be deemed to have been given when so delivered
or sent or, if mailed, five days after deposit in the U.S. mail.

          8.  GENERAL PROVISIONS.

          (a) TRANSFERS IN VIOLATION OF AGREEMENT. Any Transfer or attempted
Transfer of any Carried Units in violation of any provision of this Agreement
shall be void, and the Company shall not record such Transfer on its books or
treat any purported transferee of such Carried Units as the owner of such equity
for any purpose.

          (b) SEVERABILITY. Whenever possible, each provision of this Agreement
will 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 invalid, illegal or
unenforceable in any respect under any applicable law or rule in any
jurisdiction, such invalidity, illegality or unenforceability will

                                        9
<Page>

not affect any other provision or any other jurisdiction, but this Agreement
will be reformed, construed and enforced in such jurisdiction as if such
invalid, illegal or unenforceable provision had never been contained herein.

          (c) COMPLETE 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.

          (d) COUNTERPARTS. This Agreement may be executed in separate
counterparts (including by means of telecopied signature pages), each of which
is deemed to be an original and all of which taken together constitute one and
the same agreement.

          (e) SUCCESSORS AND ASSIGNS. Except as otherwise provided herein, this
Agreement shall bind and inure to the benefit of and be enforceable by the
Purchasers, the Company, the Investors and their respective successors and
assigns (including subsequent holders of Carried Units); PROVIDED that the
rights and obligations of the Purchasers under this Agreement shall not be
assignable except in connection with a permitted transfer of Carried Units
hereunder.

          (f) CHOICE OF LAW. The limited liability company law of the State of
Delaware will govern all questions concerning the relative rights of the Company
and its securityholders. All other questions concerning the construction,
validity and interpretation of this Agreement and the exhibits hereto will 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.

          (g) REMEDIES. Each of the parties to this Agreement (including the
Investors) will be entitled to enforce its rights under this Agreement
specifically, to recover damages and costs (including attorney's fees) caused by
any breach of any provision of this Agreement and to exercise all other rights
existing in its favor.

          (h) AMENDMENT AND WAIVER. The provisions of this Agreement may be
amended and waived only with the prior written consent of the Company, the
Purchasers holding a majority of the Carried Units held by Purchasers and the
Majority Holders (as defined in the Investor Purchase Agreement).

          (i) BUSINESS DAYS. If any time period for giving notice or taking
action hereunder expires on a day which is a Saturday, Sunday or holiday in the
state in which the Company's chief executive office is located, the time period
shall be automatically extended to the business day immediately following such
Saturday, Sunday or holiday.

          (j) ADJUSTMENTS OF NUMBERS. All numbers set forth herein which refer
to unit prices or amounts will be appropriately adjusted to reflect unit splits,
unit dividends, combinations of units and other recapitalizations affecting the
subject class of equity.

                                       10
<Page>

          (k) DEEMED TRANSFER OF CARRIED UNITS. If the Company (and/or the
Investors and/or any other Person acquiring securities) shall make available, at
the time and place and in the amount and form provided in this Agreement, the
consideration for the Carried Units to be repurchased in accordance with the
provisions of this Agreement, then from and after such time, the person from
whom such units are to be repurchased shall no longer have any rights as a
holder of such units (other than the right to receive payment of such
consideration in accordance with this Agreement), and such units shall be deemed
purchased in accordance with the applicable provisions hereof and the Company
(and/or the Investors and/or any other Person acquiring securities) shall be
deemed the owner and holder of such units, whether or not the certificates
therefor have been delivered as required by this Agreement.

          (l) NO PLEDGE OR SECURITY INTEREST. The purpose of the Company's
retention of Purchaser's certificates and executed security powers is solely to
facilitate the repurchase provisions set forth in SECTION 4 herein and SECTION 6
of the Securityholders Agreement does not constitute a pledge by Purchaser of,
or the granting of a security interest in, the underlying equity.

          (m) RIGHTS GRANTED TO GTCR AND ITS AFFILIATES. Any rights granted to
GTCR VII, GTCR VII/A, GTCR Co-Invest and their Affiliates hereunder may also be
exercised (in whole or in part) by their designees (which may be Affiliates of
GTCR Fund VII, GTCR Fund VII/A and/or GTCR Co-Invest).

                                    * * * * *

                                       11
<Page>

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

                                             TSI TELECOMMUNICATION HOLDINGS, LLC

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

                                                  /s/ Christian Schiller
                                                  Christian Schiller

                                                  /s/ Arnis Kins
                                                  Arnis Kins

                                                  /s/ John Kins
                                                  John Kins
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 1 OF 1 TO TSI / COOK ASSOCIATES PURCHASE AGREEMENT

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