Document:

<PAGE>   1
                   AMENDMENT TO THE 1998 STOCK INCENTIVE PLAN

                              OF NETWORK PLUS CORP.

         Subsection 4(a) of the 1998 Stock Incentive Plan (the "Plan") of
Network Plus Corp. is hereby amended, subject to stockholder approval, to
increase from 9,000,000 to 18,000,000 the number of shares of Common Stock, $.01
par value per share, authorized for issuance under the Plan.

                                            Adopted by the Board of Directors on
                                            April 17, 2001

                                            Approved by the Stockholders on
                                            May 7, 2001<PAGE>

                                                                     Exhibit 4.1
                                                                     -----------

NUMBER                                                          SHARES
XXXX                                                            XXXX

                                  SPECIMEN
                          ALAMOSA (DELAWARE), INC.
                           a Delaware Corporation
       The Corporation is authorized to issue 1,000 Common Shares --
                            Par Value $0.01 each

          This Certifies that XXXX_______________________________________
is the registered holder of X X X X X (XXX)______________________________
Shares of Common Stock, par value $0.01 per share, of Alamosa (Delaware),
Inc. transferable only on the books of the Corporation by the holder hereof
in person or by Attorney upon surrender of this Certificate properly
endorsed.

          In Witness Whereof, the said Corporation has caused this
Certificate to be signed by its duly authorized officers and its Corporate
Seal to be hereunto affixed this XXXX day of XXXXXX A.D. XXX.

_________________________            SEAL           ___________________________

          For Value Received, _____ hereby sell, assign and transfer unto
_______________ __________ Shares represented by the within Certificate,
and do hereby irrevocably constitute and appoint ________________________
Attorney to transfer the said Shares on the books of the within named
Corporation with full power of substitution in the premises.

         Dated _________________________________________

         In presence of  _______________________________

         _______________________________________________

                  NOTICE. THE SIGNATURE OF THIS ASSIGNMENT
             MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE
               FACE OF THE CERTIFICATE, IN EVERY PARTICULAR,
                     WITHOUT ALTERATION OR ENLARGEMENT,
                          OR ANY CHANGE WHATEVER.

                                     Page 1<PAGE>

                                                                    Exhibit 4.10
                                                                    ------------

                        THIRD SUPPLEMENTAL INDENTURE

                   THIRD SUPPLEMENTAL INDENTURE (this "Supplemental
          Indenture"), dated as of March 30, 2001, among SWLP,
          L.L.C., an Oklahoma limited liability company, SWGP,
          L.L.C., an Oklahoma limited liability company, SOUTHWEST
          PCS, L.P., an Oklahoma limited partnership, SOUTHWEST PCS
          PROPERTIES, LLC, a Delaware limited liability company,
          SOUTHWEST PCS LICENSES, LLC, a Delaware limited liability
          company (collectively, the "New Subsidiary Guarantors"),
          each a subsidiary of ALAMOSA (DELAWARE), INC., a Delaware
          corporation (the "Company"), on behalf of itself and the
          Subsidiary Guarantors (the "Existing Subsidiary
          Guarantors") under the indenture referred to below, and
          WELLS FARGO BANK MINNESOTA, N.A., a national banking
          association, as trustee under the indenture referred to
          below (the "Trustee").

                            W I T N E S S E T H:

          WHEREAS, the Company and the Existing Subsidiary Guarantors have
heretofore executed and delivered to the Trustee an Indenture dated as of
February 8, 2000, as amended by a Supplemental Indenture dated January 31,
2001 and a Second Supplemental Indenture dated February 14, 2001 (the
"Indenture"), providing for the issuance of an aggregate principal amount
at maturity of up to $350,000,000 of 127/8% Senior Discount Notes due 2010
(the "Securities");

          WHEREAS Section 4.15 of the Indenture provides that under certain
circumstances the Company is required to cause the New Subsidiary
Guarantors to execute and deliver to the Trustee a supplemental indenture
pursuant to which the New Subsidiary Guarantors shall unconditionally
guarantee all the Company's obligations under the Securities pursuant to a
Subsidiary Guaranty on the terms and conditions set forth herein; and

          WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee,
the Company and the Existing Subsidiary Guarantors are authorized to
execute and deliver this Supplemental Indenture;

          NOW THEREFORE, in consideration of the foregoing and for other
good and valuable consideration, the receipt of which is hereby
acknowledged, the New Subsidiary Guarantors, the Company, the Existing
Subsidiary Guarantors and the Trustee mutually covenant and agree for the
equal and ratable benefit of the holders of the Securities as follows:

          1. Agreement to Guarantee. The New Subsidiary Guarantors hereby
agree, jointly and severally with all other existing Subsidiary Guarantors,
to unconditionally guarantee the Company's obligations under the Securities
on the terms and subject to the conditions set forth in Articles X and XI
of the Indenture and to be bound by all other applicable provisions of the
Indenture.

          2. Ratification of Indenture; Supplemental Indentures Part of
Indenture. Except as expressly amended hereby, the Indenture is in all
respects ratified and confirmed and all the terms, conditions and
provisions thereof shall remain in full force and effect. This Supplemental
Indenture shall form a part of the Indenture for all purposes, and every
holder of Securities heretofore or hereafter authenticated and delivered
shall be bound hereby.

         3. Governing Law. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED
BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK BUT
WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE
EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE
REQUIRED THEREBY.

          4. Trustee Makes No Representation. The Trustee makes no
representation as to the validity or sufficiency of this Supplemental
Indenture.

                                     Page 1

<PAGE>

          5. Counterparts. The parties may sign any number of copies of
this Supplemental Indenture. Each signed copy shall be an original, but all
of them together represent the same agreement.

          6. Effect of Headings. The Section headings herein are for
convenience only and shall not affect the construction thereof.

          IN WITNESS WHEREOF, the parties hereto have caused this
Supplemental Indenture to be duly executed as of the date first above
written.

                         SWLP, L.L.C.

                         By:

                         /s/ David E. Sharbutt
                         -------------------------------
                         Name: David E. Sharbutt
                         Title: President

                         SWGP, L.L.C.

                         By:

                         /s/ David E. Sharbutt
                         -------------------------------
                         Name: David E. Sharbutt
                         Title: President

                         SOUTHWEST PCS, L.P.

                         By:

                         /s/ David E. Sharbutt
                         ------------------------------
                         Name: David E. Sharbutt
                         Title: President

                         SOUTHWEST PCS PROPERTIES, LLC

                         By:

                         /s/ David E. Sharbutt
                         ------------------------------
                         Name: David E. Sharbutt
                         Title: President

                         SOUTHWEST PCS LICENSES, LLC

                         By:

                         /s/ David E. Sharbutt
                         ------------------------------
                         Name: David E. Sharbutt
                         Title: President

                         ALAMOSA (DELAWARE), INC., on behalf of itself
                         and the Existing Subsidiary Guarantors

                         By:

                         /s/ David E. Sharbutt
                         ------------------------------
                         Name: David E. Sharbutt
                         Title: Chairman of the Board and
                                Chief Executive Officer

                         WELLS FARGO BANK MINNESOTA, N.A.,
                         as Trustee

                         By:

                         /s/ Timothy P. Mowdy
                         ------------------------------
                         Name: Timothy P. Mowdy
                         Title: Corporate Trust Officer

                                     Page 2<PAGE>

                                                               Exhibit 4.11
                                                               ------------

                          SECOND SUPPLEMENTAL INDENTURE

                    SECOND SUPPLEMENTAL INDENTURE (this
           "Supplemental Indenture"), dated as of March 30, 2001,
           among SWLP, L.L.C., an Oklahoma limited liability
           company, SWGP, L.L.C., an Oklahoma limited liability
           company, SOUTHWEST PCS, L.P., an Oklahoma limited
           partnership, SOUTHWEST PCS PROPERTIES, LLC, a Delaware
           limited liability company, SOUTHWEST PCS LICENSES, LLC, a
           Delaware limited liability company (collectively, the
           "New Subsidiary Guarantors"), each a subsidiary of
           ALAMOSA (DELAWARE), INC., a Delaware corporation (the
           "Company"), on behalf of itself and the Subsidiary
           Guarantors (the "Existing Subsidiary Guarantors") under
           the indenture referred to below, and WELLS FARGO BANK
           MINNESOTA, N.A., a national banking association, as
           trustee under the indenture referred to below (the
           "Trustee").

                              W I T N E S S E T H:

          WHEREAS, the Company and the Existing Subsidiary Guarantors have
heretofore executed and delivered to the Trustee an Indenture dated as of
January 31, 2001, as amended by a First Supplemental Indenture dated
February 14, 2001 (the "Indenture"), providing for the issuance of an
aggregate principal amount of up to $250,000,000 of 12-1/2% Senior Notes
due 2011 (the "Securities");

          WHEREAS Section 4.15 of the Indenture provides that under certain
circumstances the Company is required to cause the New Subsidiary
Guarantors to execute and deliver to the Trustee a supplemental indenture
pursuant to which the New Subsidiary Guarantors shall unconditionally
guarantee all the Company's obligations under the Securities pursuant to a
Subsidiary Guaranty on the terms and conditions set forth herein; and

          WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee,
the Company and the Existing Subsidiary Guarantors are authorized to
execute and deliver this Supplemental Indenture;

          NOW THEREFORE, in consideration of the foregoing and for other
good and valuable consideration, the receipt of which is hereby
acknowledged, the New Subsidiary Guarantors, the Company, the Existing
Subsidiary Guarantors and the Trustee mutually covenant and agree for the
equal and ratable benefit of the holders of the Securities as follows:

          1. Agreement to Guarantee. The New Subsidiary Guarantors hereby
agree, jointly and severally with all other existing Subsidiary Guarantors,
to unconditionally guarantee the Company's obligations under the Securities
on the terms and subject to the conditions set forth in Articles X and XI
of the Indenture and to be bound by all other applicable provisions of the
Indenture.

                                     Page 1
<PAGE>

          2. Ratification of Indenture; Supplemental Indentures Part of
Indenture. Except as expressly amended hereby, the Indenture is in all
respects ratified and confirmed and all the terms, conditions and
provisions thereof shall remain in full force and effect. This Supplemental
Indenture shall form a part of the Indenture for all purposes, and every
holder of Securities heretofore or hereafter authenticated and delivered
shall be bound hereby.

          3. Governing Law. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED
BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK BUT
WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE
EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE
REQUIRED THEREBY.

          4. Trustee Makes No Representation. The Trustee makes no
representation as to the validity or sufficiency of this Supplemental
Indenture.

          5. Counterparts. The parties may sign any number of copies of
this Supplemental Indenture. Each signed copy shall be an original, but all
of them together represent the same agreement.

          6. Effect of Headings. The Section headings herein are for
convenience only and shall not affect the construction thereof.

          IN WITNESS WHEREOF, the parties hereto have caused this
Supplemental Indenture to be duly executed as of the date first above
written.

                              SWLP, L.L.C.

                                By:

                                    /s/ David E. Sharbutt
                                    --------------------------------------
                                    Name:   David E. Sharbutt
                                    Title:  President

                              SWGP, L.L.C.

                                By:

                                    /s/ David E. Sharbutt
                                    --------------------------------------
                                    Name:   David E. Sharbutt
                                    Title:  President

                              SOUTHWEST PCS, L.P.

                                By:

                                    /s/ David E. Sharbutt
                                    --------------------------------------
                                    Name:   David E. Sharbutt
                                    Title:  President

                                     Page 2
<PAGE>

                              SOUTHWEST PCS PROPERTIES, LLC

                                By:

                                    /s/ David E. Sharbutt
                                    --------------------------------------
                                    Name:   David E. Sharbutt
                                    Title:  President

                              SOUTHWEST PCS LICENSES, LLC

                                By:

                                    /s/ David E. Sharbutt
                                    --------------------------------------
                                    Name:   David E. Sharbutt
                                    Title:  President

                              ALAMOSA (DELAWARE), INC., on behalf of itself
                              and the Existing Subsidiary Guarantors

                                By:

                                    /s/ David E. Sharbutt
                                    --------------------------------------
                                    Name:   David E. Sharbutt
                                    Title:  Chairman of the Board and
                                            Chief Executive Officer

                               WELLS FARGO BANK MINNESOTA, N.A.,
                                   as Trustee

                                By:

                                    /s/ Timothy P. Mowdy
                                    --------------------------------------
                                    Name:   Timothy P. Mowdy
                                    Title:  Corporate Trust Officer
                                            Chief Executive Officer

                                     Page 3

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