Document:

<PAGE>

                                    SH98298

Exhibit 10.45
-------------

                                ADDENDUM VI
                                     TO
                      SPRINT PCS MANAGEMENT AGREEMENT

                         Dated as of March 30, 2001

Manager: ALAMOSA WISCONSIN LIMITED PARTNERSHIP

Service Area BTAs:

Appleton-Oshkosh # 18,
Eau Claire # 123,
Fond du Lac # 148,
Green Bay # 173,
La Crosse-Winona # 234,
Madison # 272 (Only Columbia, Juneau, Marquette, Sauk Counties and those
portions of Dane County where Manager will meet Sprint PCS coverage along
Highway 151 and I- 90/94 north of Madison),
Manitowoc # 276,
Milwaukee #297 (Only those portions of Dodge County not currently covered by
SprintPCS along Highway 41 and the City of Watertown),
Minneapolis-St. Paul # 298 (Only Barron County and those portions of Polk
County not currently covered by Sprint PCS along Highway 8 near the city of
St. Croix Falls),
Sheboygan # 417,
Stevens Point-Marshfield-Wisconsin Rapids # 432,
Wausau-Rhinelander # 466.

         This Addendum VI (this "Addendum") contains certain additional and
supplemental terms and provisions of that certain Sprint PCS Management
Agreement entered into as of December 6, 1999 by the same parties as this
Addendum, which Management Agreement was further amended by that certain
Addendum I entered into as of December 6, 1999, that certain Addendum II
entered into as of February 3, 2000, that certain Addendum III entered into
as of April 25, 2000, that certain Addendum IV entered into as of June 23,
2000, and that certain Addendum V entered into as of February 14, 2001 (the
"Management Agreement").

         The terms and provisions of the Addendum control, supersede and
amend any conflicting terms and provisions contained in the Management
Agreement. Except for express modifications made in this Addendum, the
Management Agreement and all prior addenda continue in full force and
effect.

         Capitalized terms used and not otherwise defined in this Addendum
have the meaning ascribed to them in the Schedule of Definitions. Section
and Exhibit references are to Sections and Exhibits of the Management
Agreement unless otherwise noted.

         The Management Agreement is modified as follows:

1. Use of Loan Proceeds. Sprint PCS is entering into that certain Amended
and Restated Consent and Agreement with Citicorp USA, Inc., dated as of
March 30, 2001 ("Citicorp") (which Amended and Restated Consent and
Agreement, as amended and modified from time to time, is referred to as the
"Consent and Agreement") to enable Manager to obtain a loan (the "Loan")
from Citicorp, its successors, and other lenders who from time to time are
parties to the Consent and Agreement (collectively, the "Lenders"). Manager
agrees that notwithstanding the permitted uses of the proceeds of the Loan,
it will not use the proceeds from the Loan or any other loan, extension of
credit or other obligation to which the Consent and Agreement relates, for
any purpose other than to (a) construct and operate the Service Area
Network within the Service Area (as may be amended from time to time) as
contemplated under the Management Agreement, (b) pay the cash portion of
the merger consideration to the Target (as defined in that certain
Commitment Letter dated March 9, 2001, between Citicorp North America,
Inc., Salomon Smith Barney, Inc., TD Securities (USA) Inc., Export
Development Corporation and Alamosa Holdings, Inc. (the "Commitment
Letter")), (c) refinance existing indebtedness under the Southwest Facility
(as that term is defined in the Commitment Letter), and (d) pay the
Transaction Costs (as that term is defined in the Commitment Letter).

                                     Page 1
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2. Definition of "Other Parties". The parties agree to amend the definition
of "Other Parties" to include Southwest PCS, L.P., an Oklahoma limited
partnership.

3. Revised Financing Plan. Exhibit 1.7 attached to this Addendum supersedes
and replaces in it entirety Exhibit 1.7 attached to the Management
Agreement.

4. Reaffirmation of Sprint Agreements. Each of the undersigned reaffirms in
their entirety, together with the respective rights and obligations
thereunder, the Management Agreement, the Services Agreement and the
License Agreements.

5. Counterparts. This Addendum may be executed in two or more counterparts,
each of which shall constitute an original but all which when taken
together shall constitute but one agreement.

         [the remainder of this page is intentionally left blank]

         IN WITNESS WHEREOF, the parties have caused this Addendum VI to be
executed as of the date first above written.

                              SPRINT SPECTRUM L.P.

                              By:  /s/  Thomas E. Mateer
                                   ------------------------------
                                    Thomas E. Mateer
                                    Vice President - Affiliations

                              WIRELESSCO, L.P.

                              By:  /s/  Thomas E. Mateer
                                   ------------------------------
                                    Thomas E. Mateer
                                    Vice President - Affiliations

                              SPRINT COMMUNICATIONS
                              COMPANY, L.P.

                              By:  /s/  Ed Mattix
                                   ------------------------------
                                    Ed Mattix,
                                    Senior Vice President - Public Affairs

                              ALAMOSA WISCONSIN LIMITED  PARTNERSHIP
                              a Wisconsin limited partnership

                              By:      ALAMOSA WISCONSIN GP, L.L.C.
                                       a Delaware limited liability company,
                                       as the sole general partner

                                       By:  /s/  David E. Sharbutt
                                            ------------------------------------
                                            David E. Sharbutt,
                                            President

                                     Page 2<PAGE>

                                                                  Exhibit 10.46
                                                                  -------------

                                ADDENDUM VII
                                     TO
                      SPRINT PCS MANAGEMENT AGREEMENT

                         Dated as of March 30, 2001

Manager: TEXAS TELECOMMUNICATIONS, LP

Service Area BTAs:

Flagstaff, AZ # 144                                  Abilene, TX # 3
Phoenix, AZ # 347 (Navajo County, AZ)                Amarillo, TX # 13
Prescott, AZ # 362                                   Eagle Pass, TX #121
Grand Junction, CO # 168                             El Paso, TX # 128
Pueblo, CO # 366                                     Laredo, TX #242
Albuquerque, NM # 8                                  Lubbock, TX # 264
Carlsbad, NM # 68                                    Midland, TX # 296
Farmington, NM-Durango, CO # 139                     Odessa, TX # 327
Gallup, NM # 162                                     San Angelo, TX # 400
Las Cruces, NM # 244
Roswell, NM #386
Santa Fe, NM # 407

Expansion Service Area BTAs:

Las Vegas, AZ # 245 (portion of Mohave County)
Colorado Springs, CO # 89 (portion of El Paso County)
Phoenix, AZ # 347 (portion of Maricopa and Pinal County)
Clovis, NM #87
Sierra Vista-Douglas, AZ # 420
Hobbs, NM # 191
Tucson, AZ # 447 (portion of Pima County)
Big Spring, TX # 40
Yuma, AZ #486
El Centro-Calexico, CA # 124
San Diego, CA # 402 (portion of San Diego County)

         This Addendum VII (this "Addendum") contains certain additional
and supplemental terms and provisions of that certain Sprint PCS Management
Agreement entered into as of December 23, 1999 by the same parties as this
Addendum, which Management Agreement was further amended by that certain
Addendum I entered into as of December 23, 1999, that certain Addendum II
entered into as of February 3, 2000, that certain Addendum III entered into
as of April 25, 2000, that certain Addendum IV entered into as of June 23,
2000, that certain Addendum V entered into as of January 31, 2001, and that
certain Addendum VI entered into as of February 14, 2001 (the "Management
Agreement").

         The terms and provisions of the Addendum control, supersede and
amend any conflicting terms and provisions contained in the Management
Agreement. Except for express modifications made in this Addendum, the
Management Agreement and all prior addenda continue in full force and
effect.

         Capitalized terms used and not otherwise defined in this Addendum
have the meaning ascribed to them in the Schedule of Definitions. Section
and Exhibit references are to Sections and Exhibits of the Management
Agreement unless otherwise noted.

                                     Page 1

<PAGE>

         The Management Agreement is modified as follows:

1. Use of Loan Proceeds. Sprint PCS is entering into that certain Amended
and Restated Consent and Agreement with Citicorp USA, Inc., dated as of
March 30, 2001 ("Citicorp") (which Amended and Restated Consent and
Agreement, as amended and modified from time to time, is referred to as the
"Consent and Agreement") to enable Manager to obtain a loan (the "Loan")
from Citicorp, its successors, and other lenders who from time to time are
parties to the Consent and Agreement (collectively, the "Lenders"). Manager
agrees that notwithstanding the permitted uses of the proceeds of the Loan,
it will not use the proceeds from the Loan or any other loan, extension of
credit or other obligation to which the Consent and Agreement relates, for
any purpose other than to (a) construct and operate the Service Area
Network within the Service Area (as may be amended from time to time) as
contemplated under the Management Agreement, (b) pay the cash portion of
the merger consideration to the Target (as defined in that certain
Commitment Letter dated March 9, 2001, between Citicorp North America,
Inc., Salomon Smith Barney, Inc., TD Securities (USA) Inc., Export
Development Corporation and Alamosa Holdings, Inc. (the "Commitment
Letter")), (c) refinance existing indebtedness under the Southwest Facility
(as that term is defined in the Commitment Letter), and (d) pay the
Transaction Costs (as that term is defined in the Commitment Letter).

2. Definition of "Other Parties". The parties agree to amend the definition
of "Other Parties" to include Southwest PCS, L.P., an Oklahoma limited
partnership.

3. Revised Financing Plan. Exhibit 1.7 attached to this Addendum supersedes
and replaces in it entirety Exhibit 1.7 attached to the Management
Agreement.

4. Reaffirmation of Sprint Agreements. Each of the undersigned reaffirms in
their entirety, together with the respective rights and obligations
thereunder, the Management Agreement, the Services Agreement and the
License Agreements.

5. Counterparts. This Addendum may be executed in two or more counterparts,
each of which shall constitute an original but all which when taken
together shall constitute but one agreement.

         [the remainder of this page was intentionally left blank]

                                     Page 2

<PAGE>

         IN WITNESS WHEREOF, the parties have caused this Addendum VII to
be executed as of the date first above written.

                           SPRINT SPECTRUM L.P.

                           By:  /s/  Thomas E. Mateer
                           -----------------------------------
                                     Thomas E. Mateer
                                     Vice President - Affiliations

                           WIRELESSCO, L.P.

                           By:  /s/  Thomas E. Mateer
                           -----------------------------------
                                     Thomas E. Mateer
                                     Vice President - Affiliations

                           SPRINT COMMUNICATIONS
                           COMPANY, L.P.

                           By:  /s/  Ed Mattix
                           -----------------------------------------
                                     Ed Mattix,
                                     Senior Vice President - Public Affairs

                           TEXAS TELECOMMUNICATIONS, LP
                           a Texas limited partnership

                           By:      ALAMOSA DELAWARE GP, L.L.C.
                                    a Delaware limited liability company,
                                    as the sole general partner

                                    By:        /s/  David E. Sharbutt
                                             ----------------------------
                                             David E. Sharbutt
                                             President

                                     Page 3

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