Document:

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CINGULAR WIRELESS                                                    Exhibit 4.4
EXHIBITS

THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE
HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR A
NOMINEE THEREOF. THIS SECURITY MAY NOT BE EXCHANGED IN WHOLE OR IN PART FOR A
SECURITY REGISTERED, AND NO TRANSFER OF THIS SECURITY IN WHOLE OR IN PART MAY BE
REGISTERED, IN THE NAME OF ANY PERSON OTHER THAN SUCH DEPOSITARY OR A NOMINEE
THEREOF, EXCEPT IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE.

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO THE COMPANY OR ITS
AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE
ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO
CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER
HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

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CINGULAR WIRELESS                                                    Exhibit 4.4
EXHIBITS

                              Cingular Wireless LLC

                          7.125% Senior Notes Due 2031

                                                            CUSIP NO. 17248R AJ5
                                                             ISIN NO. US172RAJ59
No. R-2                                                      $249,750,000

Cingular Wireless LLC, a limited liability company duly organized and existing
under the laws of the State of Delaware (herein called the "Company", which term
includes any successor Person under the Indenture hereinafter referred to), for
value received, hereby promises to pay to Cede & Co., or registered assigns, the
principal sum of TWO HUNDRED FOURTY-NINE MILLION SEVEN HUNDRED FIFTY THOUSAND
($249,750,000) on December 15, 2031, and to pay interest thereon from June 15,
2002 or from the most recent Interest Payment Date to which interest has been
paid or as duly provided for, semi-annually on June 15 and December 15 in each
year, commencing December 15, 2002, at the rate of 7.125% per annum, until the
principal hereof is paid or made available for payment.

The interest so payable, and punctually paid or duly provided for, on any
Interest Payment Date shall, as provided in such Indenture, be paid to the
Person in whose name this Security (or one or more Predecessor Securities) is
registered at the close of business on the Regular Record Date for such
interest, which shall be the June 1 or December 1 (whether or not a Business
Day), as the case may be, next preceding such Interest Payment Date. Any such
interest not so punctually paid or duly provided for shall forthwith cease to be
payable to the Holder on such Regular Record Date and may either be paid to the
Person in whose name this Security (or one or more Predecessor Securities) is
registered at the close of business on a Special Record Date for the payment of
such Defaulted Interest to be fixed by the Trustee, notice whereof shall be
given to Holders of Securities of this series not less than 10 days prior to
such Special Record Date, or be paid at any time in any other lawful manner not
inconsistent with the requirements of any securities exchange on which the
Securities of this series may be listed, and upon such notice as may be required
by such exchange, all as more fully provided in said Indenture.

Payment of the principal of (and premium, if any) and interest on this Security
shall be made at the office or agency of the Company maintained for that purpose
in New York, New York, which is currently at 55 Water Street, 1st Floor, New
York, New York 10041, in such coin or currency of the United States of America
as at the time of payment is legal tender for payment of public and private
debts; provided, however, that at the option of the Company payment of interest
may be made by check mailed to the address of the Person entitled thereto as
such address shall appear in the Security Register.

Reference is hereby made to the further provisions of this Security set forth on
the reverse hereof, which further provisions shall for all purposes have the
same effect as if set forth at this place.

Unless the certificate of authentication hereon has been executed by the Trustee
referred to on the reverse hereof by manual signature, this Security shall not
be entitled to any benefit under the Indenture or be valid or obligatory for any
purpose.

                                      -2-
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CINGULAR WIRELESS                                                    Exhibit 4.4
EXHIBITS

IN WITNESS WHEREOF, Cingular Wireless Corporation, the manager of the Company,
has caused this instrument to be duly executed on behalf of the Company. Dated:
August 28, 2002

                                       CINGULAR WIRELESS LLC

                                       By: CINGULAR WIRELESS CORPORATION,
                                           as Manager

                                       By:   /s/  Sean Foley
                                           -------------------------------------
                                           Name:  Sean Foley
                                           Title: Vice President -Treasurer

Attest:

------------------------

This is one of the Securities of the series designated therein referred to in
the within-mentioned Indenture.

                                                   Bank One Trust Company, N.A.,
                                                   As Trustee

                                                   By:  /s/ David B. Knox
                                                      --------------------------
                                                           David B. Knox

                                      -3-
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CINGULAR WIRELESS                                                    Exhibit 4.4
EXHIBITS

This Security is one of a duly authorized issue of securities of the Company
(herein called the "Securities"), issued and to be issued in one or more series
under an Indenture, dated as of December 12, 2001 (herein called the
"Indenture", which term shall have the meaning assigned to it in such
instrument), between the Company and Bank One Trust Company, N.A., as Trustee
(herein called the "Trustee", which term includes any successor trustee under
the Indenture), and reference is hereby made to the Indenture for a statement of
the respective rights, limitations of rights, duties and immunities thereunder
of the Company, the Trustee and the Holders of the Securities and of the terms
upon which the Securities are, and are to be, authenticated and delivered. This
Security is one of the series designated on the face hereof, limited at the date
hereof in aggregate principal amount to $750,000,000; provided that the Company
may from time to time, without notice to or the consent of the Holders of
Securities, create and issue further Securities of this Series (the "Additional
Securities") having the same terms and ranking equally and ratably with the
Securities in all respects, or in all respects except for the payment of
interest accruing prior to the Issue Date or except for the first payment of
interest following the Issue Date of such Additional Securities. Any Additional
Securities will be consolidated and form a single series with the Securities and
shall have the same terms as to status, redemption or otherwise as the
Securities. Any Additional Securities may be issued pursuant to authorization
provided by a resolution of the Board of Directors of Cingular Wireless
Corporation, the manager of the Company, a supplement to the Indenture, or under
an Officers' Certificate pursuant to the Indenture.

The Securities of this series are subject to redemption upon not less than 30
days' but not more than 60 days' notice by mail, at any time, as a whole or in
part, at the election of the Company, at a redemption price equal to (i) 100% of
the principal amount of the Securities to be redeemed, together with accrued
interest (including Special Interest) to the Redemption Date, if any, but
interest installments whose Stated Maturity is on or prior to such Redemption
Date shall be payable to the Holders of such Securities, or one or more
Predecessor Securities, of record at the close of business on the relevant
Record Dates referred to on the face hereof, all as provided in the Indenture,
plus (ii) the Make-Whole Amount, if any.

The Redemption Price will be calculated assuming a 360-day year consisting of
twelve 30-day months. "Make-Whole Amount" means the excess, if any, of the
aggregate present value as of the Redemption Date of each dollar of principal
being redeemed and the amount of interest (exclusive of interest accrued to the
Redemption Date) that would have been payable in respect of such dollar if such
prepayment had not been made, determined by discounting, on a semiannual basis,
such principal and interest at the Treasury Rate, plus 0.30% from the date on
which such principal and interest would have been payable if the Security had
not been redeemed, over the principal amount of the Security being redeemed.

"Treasury Rate" means (i) the yield to maturity at the time of computation of
U.S. Treasury securities with a constant maturity, as compiled by and published
in the most recent Statistical Release that has become publicly available at
least two Business Days prior to the Redemption Date, equal to the then
remaining maturity of this Security; if no maturity exactly corresponds to such
maturity, yields for the two published maturities most closely corresponding to
such maturity shall be calculated pursuant to the immediately preceding clause
and the Treasury Rate shall be interpolated or extrapolated from such yields on
a straight-line basis, rounding in each of such relevant periods to the nearest
month; or (ii) if the Statistical Release is not published during the week
preceding the calculation date or does not contain such yields, the rate per
annum equal to the semi-annual equivalent yield to maturity of the Comparable
Treasury Issue, calculated using a price for the Comparable Treasury Issue
(expressed as a percentage of its principal amount) equal to the Comparable
Treasury Price for such Redemption Date. The Treasury Rate shall be calculated
on the third Business Day preceding the Redemption Date.

"Comparable Treasury Issue" means the U.S. Treasury security selected by an
Independent Investment Banker as having a maturity comparable to the remaining
term ("Remaining Life") of this Security that

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CINGULAR WIRELESS                                                    Exhibit 4.4
EXHIBITS

would be utilized, at the time of selection and in accordance with customary
financial practice, in pricing new issues of corporate debt securities of
comparable maturity to the remaining term of this Security. "Comparable Treasury
Price" means (i) the average of three out of five Reference Treasury Dealer
Quotations for such Redemption Date, after excluding the highest and lowest
Reference Treasury Dealer Quotations, or (ii) if the Independent Investment
Banker obtains fewer than five such Reference Treasury Dealer Quotations, the
average of all such quotations.

"Independent Investment Banker" means (i) any of Lehman Brothers Inc., Goldman,
Sachs & Co. or J.P. Morgan Securities Inc. and their respective successors, as
selected by the Company, or (ii) if all those firms are unwilling or unable to
select the Comparable Treasury Issue, an independent investment banking
institution of national standing appointed by the Company.

"Reference Treasury Dealer" means (i) Lehman Brothers Inc., Goldman, Sachs & Co.
and J.P. Morgan Securities Inc. and their respective successors, provided, that
if any of the foregoing shall cease to be a primary U.S. Government securities
dealer in New York City (a "Primary Treasury Dealer"), the Company will
substitute another Primary Treasury Dealer and (ii) any other Primary Treasury
Dealer selected by any Independent Investment Banker after consultation with the
Company.

"Reference Treasury Dealer Quotations" means, with respect to each Reference
Treasury Dealer and any Redemption Date, the average, as determined by the
Independent Investment Banker, of the bid and asked prices for the Comparable
Treasury Issue (expressed in each case as a percentage of its principal amount)
quoted in writing to the Independent Investment Banker at 5:00 p.m., New York
City time, on the third Business Day preceding such Redemption Date.

"Statistical Release" means the statistical release designated "H.15(519)" or
any successor publication which is published weekly by the Federal Reserve
System and which establishes yields on actively traded U.S. government
securities adjusted to constant maturities.

In the event of redemption of this Security in part only, a new Security or
Securities of this series and of like tenor for the unredeemed portion hereof
shall be issued in the name of the Holder hereof upon the cancellation hereof.

The Indenture contains provisions for defeasance at any time of the entire
indebtedness of this Security or certain restrictive covenants and Events of
Default with respect to this Security, in each case upon compliance with certain
conditions set forth in the Indenture.

If an Event of Default with respect to Securities of this series shall occur and
be continuing, the principal of the Securities of this series may be declared
due and payable in the manner and with the effect provided in the Indenture.

The Indenture permits, with certain exceptions as therein provided, the
amendment thereof and the modification of the rights and obligations of the
Company and the rights of the Holders of the Securities of each series to be
affected under the Indenture at any time by the Company and the Trustee with the
consent of the Holders of a majority in principal amount of the Securities at
the time Outstanding of each series to be affected. The Indenture also contains
provisions permitting the Holders of specified percentages in principal amount
of the Securities of each series at the time Outstanding, on behalf of the
Holders of all Securities of such series, to waive compliance by the Company
with certain provisions of the Indenture and certain past defaults under the
Indenture and their consequences. Any such consent or waiver by the Holder of
this Security shall be conclusive and binding upon such Holder and upon all
future Holders of this Security and of

                                      -5-
<PAGE>

CINGULAR WIRELESS                                                    Exhibit 4.4
EXHIBITS

any Security issued upon the registration of transfer hereof or in exchange
herefor or in lieu hereof, whether or not notation of such consent or waiver is
made upon this Security.

As provided in and subject to the provisions of the Indenture, the Holder of
this Security shall not have the right to institute any proceeding with respect
to the Indenture or for the appointment of a receiver or trustee or for any
other remedy thereunder, unless such Holder shall have previously given the
Trustee written notice of a continuing Event of Default with respect to the
Securities of this series, the Holders of not less than 25% in principal amount
of the Securities of this series at the time Outstanding shall have made written
request to the Trustee to institute proceedings in respect of such Event of
Default as Trustee and offered the Trustee reasonable indemnity, and the Trustee
shall not have received from the Holders of a majority in principal amount of
Securities of this series at the time Outstanding a direction inconsistent with
such request, and the Trustee shall have failed to institute any such
proceeding, for 60 days after receipt of such notice, request and offer of
indemnity. The foregoing shall not apply to any suit instituted by the Holder of
this Security for the enforcement of any payment of principal hereof or any
premium or interest hereon on or after the respective due dates expressed
herein.

No reference herein to the Indenture and no provision of this Security or of the
Indenture shall alter or impair the obligation of the Company, which is absolute
and unconditional, to pay the principal of and any premium and interest on this
Security at the times, place and rate, and in the coin or currency, herein
prescribed.

As provided in the Indenture and subject to certain limitations therein set
forth, the transfer of this Security is registrable in the Security Register,
upon surrender of this Security for registration of transfer at the office or
agency of the Company in any place where the principal of and any premium and
interest on this Security are payable, duly endorsed by, or accompanied by a
written instrument of transfer in form satisfactory to the Company and the
Security Registrar duly executed by, the Holder hereof or his attorney duly
authorized in writing, and thereupon one or more new Securities of this series
and of like tenor, of authorized denominations and for the same aggregate
principal amount, shall be issued to the designated transferee or transferees.

The Securities of this series are issuable only in registered form without
coupons in denominations of $1,000 and any integral multiple thereof. As
provided in the Indenture and subject to certain limitations therein set forth,
Securities of this series are exchangeable for a like aggregate principal amount
of Securities of this series and of like tenor of a different authorized
denomination, as requested by the Holder surrendering the same.

No service charge shall be made to a Holder for any such registration of
transfer or exchange, but the Company may require payment of a sum sufficient to
cover any tax or other governmental charge payable in connection therewith.

Prior to due presentment of this Security for registration of transfer, the
Company, the Trustee and any agent of the Company or the Trustee may treat the
Person in whose name this Security is registered as the owner hereof for all
purposes, whether or not this Security be overdue, and none of the Company, the
Trustee nor any such agent shall be affected by notice to the contrary.

All terms used in this Security which are defined in the Indenture shall have
the meanings assigned to them in the Indenture.

This Security shall be governed by and construed in accordance with the laws of
the State of New York, without regard to principles of conflicts of laws.

                                      -6-<PAGE>

CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

CAPITAL MARKETS DEBT SUBORDINATION AGREEMENT

            CAPITAL MARKETS DEBT SUBORDINATION AGREEMENT, dated as of November
21, 2000, among SBC COMMUNICATIONS INC., a Delaware corporation ("SBC"),
BELLSOUTH CORPORATION, a Georgia corporation ("BellSouth"), any subsidiary of
SBC or BellSouth that is or hereafter becomes bound to the terms of this
agreement in the manner described herein (a "Subsidiary Lender"; SBC, BellSouth
(for itself and as successor by merger to BellSouth Capital Funding Corporation)
and each Subsidiary Lender is referred to herein as a "Subordinated Creditor"
and, collectively, the "Subordinated Creditors"), and CINGULAR WIRELESS LLC, a
Delaware limited liability company (the "Borrower").

                              W I T N E S S E T H:

            WHEREAS, each of the Subordinated Creditors has extended credit, and
may in the future extend credit, to the Borrower and its Subsidiaries; and

            WHEREAS, by entering into, or agreeing to be bound by, the terms of
this Capital Markets Subordination Agreement each Subordinated Creditor desires
to agree, for the benefit of the holders of Senior Capital Markets Debt (as
defined herein), to certain subordination and related terms that shall apply to
any such credit, provided that such credit is identified on Schedule A hereto,
in the case of SBC or any Subsidiary of SBC, or Schedule B hereto, in the case
of BellSouth or any Subsidiary of BellSouth (all such indebtedness identified on
such schedules, as such schedules may from time to time be supplemented in
accordance with the terms hereof and as the original maturities of such
indebtedness may have been extended by the Initial Subordination Agreement (as
hereinafter defined), the "Shareholder Loans"); and

            WHEREAS, the Borrower has entered into a 364-day Credit Agreement,
dated as of November 20, 2000, among the Borrower, the Lenders party thereto,
and Morgan Guaranty Trust Company of New York, as Administrative Agent (as the
same may be amended, modified, supplemented or restated from time to time, and
any replacement, substitution, refunding or refinancing of all or any portion
thereof which by its terms is stated to be entitled to the benefits of the
Initial Subordination Agreement defined below, whether with the same or
different lenders, the "Credit Agreement"); and

            WHEREAS, in connection therewith the Borrower and the Subordinated
Creditors entered into a Subordination and Extension Agreement, dated as of
November 20, 2000, as amended or proposed to be amended by Amendment No. 1,
dated as of October 23, 2001 (the "Initial Subordination Agreement"); and

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CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

            WHEREAS, under the terms of the Initial Subordination Agreement, the
parties thereto contemplated that additional "Senior Pari Passu Debt" (as
defined therein) could be issued by the Borrower from time to time; and

            WHEREAS, the Borrower intends to issue Senior Capital Markets Debt
from time to time that qualifies as "Senior Pari Passu Debt" under the Initial
Subordination Agreement;

            NOW, THEREFORE, in consideration of the premises, the parties hereto
hereby agree as follows:

            SECTION 1. DEFINITIONS

            1.1 The following terms shall have the following meanings:

                  "Agreement": This Capital Markets Debt Subordination
            Agreement, as the same may be amended, supplemented or otherwise
            modified from time to time.

                  "interest": with respect to any Senior Capital Markets Debt
            shall also refer to any additional interest or liquidated damages
            payable under any registration rights agreement.

                  "Other Creditor": has the meaning specified in Section 2.5(a)
            of this Agreement.

                  "Person": any individual, entity or organization.

                  "Senior Bank Debt": all "Senior Debt" as defined in the
            Initial Subordination Agreement.

                  "Senior Capital Markets Debt": all obligations payable from
            time to time by the Borrower pursuant to (i) each commercial paper
            note issued from time to time by the Borrower pursuant to the terms
            of the Issuing and Paying Agent Agreement, dated as of November 15,
            2000, between the Borrower and Chase Manhattan Bank, as issuing and
            paying agent, as amended, modified, supplemented or restated from
            time to time, (ii) each other commercial paper note, commercial note
            or similar indebtedness for borrowed money having an original
            maturity of 390 days or less (but the maturity of which may be
            extendible, either automatically unless the holder elects to the
            contrary or on some other basis), and (iii) each other obligation of
            the Borrower to creditors other than the Subordinated Creditors (A)
            that each of SBC and BellSouth has approved

                                      -8-
<PAGE>

CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

            as Senior Capital Markets Debt by executing a notice substantially
            in the form of Exhibit B hereto and delivering a signed counterpart
            thereof to the Borrower and (B)(I) which by its terms is expressly
            stated to be "Senior Capital Markets Debt" under this Agreement or
            (II) which the Borrower from time to time after the issuance thereof
            has notified in writing the creditors for such obligation or their
            trustee, agent or other representative is "Senior Capital Markets
            Debt" under this Agreement, in each case with respect to obligations
            referred to in clauses (i) - (iii) above including, without
            limitation, all obligations for the payment of principal of and
            interest (including interest accruing on or after, or which would
            accrue but for, the filing of any petition in bankruptcy or for
            reorganization relating to the Borrower, whether or not a claim for
            post-petition interest is allowed in such proceeding) on any amounts
            due thereunder.

                  "Senior Pari Passu Debt": the Senior Capital Markets Debt and
            Senior Bank Debt, together with each other obligation of the
            Borrower to creditors other than the Subordinated Creditors the
            payment of which by its terms is expressly stated to be senior to
            payment of the Subordinated Obligations and which is expressly
            entitled by agreement of the Subordinated Creditors to pro rata
            payment by the Borrower (on the basis of then outstanding unpaid
            obligations) on a pari passu basis with all payments by the Borrower
            to the holders of Senior Capital Markets Debt, Senior Bank Debt and
            other Senior Pari Passu Debt required herein from payments that
            would otherwise be made to the Subordinated Creditors.

                  "Subordinated Obligations": the collective reference to the
            unpaid obligations with respect to the Shareholder Loans, whether
            direct or indirect, absolute or contingent, due or to become due, or
            now existing or hereafter incurred, which may arise under, out of,
            or in connection with the Shareholder Loans, in each case whether on
            account of principal, interest, reimbursement obligations, fees
            indemnities, costs, expenses or otherwise (including, without
            limitation, all fees and disbursements of counsel to the
            Subordinated Creditors that are required to be paid by the Borrower
            pursuant to the terms of any Shareholder Loans).

                  "Subsidiary": as to any Person, any corporation or other
            entity of which securities or other ownership interests having
            ordinary voting power to elect a majority of the board of directors
            or other persons performing

                                      -9-
<PAGE>

CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

            similar functions are at the time directly or indirectly owned by
            such Person.

            1.2 The words "hereof," "herein" and "hereunder" and words of
similar import when used in this Agreement shall refer to this Agreement as a
whole and not to any particular provision of this Agreement, and section and
paragraph references are to this Agreement unless otherwise specified.

            1.3 The meanings given to terms defined herein shall be equally
applicable to both the singular and plural forms of such terms.

            SECTION 2. TERMS OF SUBORDINATION

            2.1 Subordination. (a) Each Subordinated Creditor agrees, for itself
and each future holder of the Subordinated Obligations, that the Subordinated
Obligations are expressly subordinate and junior in right of payment to all
Senior Capital Markets Debt.

            (b) As used herein, "subordinate and junior in right of payment"
shall mean that:

            (i) No payment or prepayment of any principal, premium (if any) or
      interest on account of a Subordinated Obligation and no repurchase,
      redemption or other retirement (whether at the option of the holder or
      otherwise) of a Subordinated Obligation shall be made so long as this
      Agreement is effective; provided that payments of interest or premium or
      payments or prepayments of principal may be made from any source, if, at
      the time of such payment or prepayment and immediately after giving effect
      thereto, there shall not exist a default in the payment or prepayment of
      any principal of or interest on any Senior Capital Markets Debt;

            (ii) In the event of any insolvency or bankruptcy proceedings, or
      any receivership, liquidation, reorganization or other similar
      proceedings, relative to the Borrower or to its creditors, as such, or to
      its property, or in the event of any proceeding for voluntary liquidation,
      dissolution or other winding up of the Borrower, whether or not involving
      insolvency or bankruptcy, then the holders of all Senior Pari Passu Debt
      shall be entitled to receive payment in full in cash of all Senior Pari
      Passu Debt before the holders of the Subordinated Obligations are entitled
      to receive any payment on account of the Subordinated Obligations, and to

                                      -10-
<PAGE>

CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

      that end the holders of the Senior Pari Passu Debt shall be entitled to
      receive pro rata distributions of any kind or character, whether in cash
      or property or securities, which may be payable or deliverable in any such
      proceedings in respect of the Subordinated Obligations;

            (iii) If any Subordinated Obligation is declared or otherwise
      becomes due and payable (under circumstances when the provisions of the
      foregoing paragraphs (i) or (ii) are not applicable, whether as a result
      of the occurrence of an event of default under such Subordinated
      Obligations or otherwise), the holders of Senior Pari Passu Debt
      outstanding at the time such Subordinated Obligations so become due and
      payable shall be entitled to receive payment in full of all Senior Pari
      Passu Debt before the holders of the Subordinated Obligations are entitled
      to receive any payment on account of the Subordinated Obligations;

            (iv) If, notwithstanding the occurrence of any of the events
      described in paragraphs (i) (other than a payment permitted by the proviso
      thereto), (ii) and (iii), any such payment or distribution of assets of
      the Borrower of any kind or character, whether in cash, property or
      securities, shall be received by the holders of Subordinated Obligations
      before all Senior Pari Passu Debt is paid in full in cash, or provision
      made for such payment in a manner satisfactory to each holder of Senior
      Pari Passu Debt (or such holder's representative, which in the case of
      Senior Capital Markets Debt issued pursuant to an indenture shall be the
      trustee thereunder), such payment or distribution shall be held in trust
      for the benefit of, and shall be paid over or delivered to, the holders of
      Senior Pari Passu Debt or their representative or representatives, as
      their respective interests may appear, for application to the payment of
      all Senior Pari Passu Debt remaining unpaid to the extent necessary to pay
      such Senior Pari Passu Debt in full in cash, in accordance with its terms,
      after giving effect to any concurrent payment or distribution to all
      holders of such Senior Pari Passu Debt; and

            (v) No holder of Senior Capital Markets Debt shall be prejudiced in
      its right to enforce subordination of the Subordinated Obligations by any
      act or failure to act on the part of the Borrower; provided that the
      foregoing provisions are solely for the purpose of defining the relative
      rights of the holders of Senior Capital Markets Debt, on the one hand, and
      the holders of Subordinated Obligations, on the other hand, and that
      nothing herein

                                      -11-
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CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

      shall impair, as between the Borrower and the holders of the Subordinated
      Obligations, the obligation of the Borrower, which shall be unconditional
      and absolute, to pay to the holders of the Subordinated Obligations the
      principal and premium (if any) thereof and interest thereon in accordance
      with its terms, nor shall anything therein prevent the holders of the
      Subordinated Obligations from exercising all remedies otherwise permitted
      by applicable law or the instruments pursuant to which the Subordinated
      Obligations were issued upon default thereunder, subject to the rights
      under paragraphs (i), (ii), (iii), and (iv) above of the holders of Senior
      Pari Passu Debt to receive cash, property or securities otherwise payable
      or deliverable to the holders of the Subordinated Obligations.

            (c) The expressions "prior payment in full," "payment in full,"
"paid in full", "fully paid and satisfied" and any other similar terms or
phrases when used in this Agreement, with respect to the Senior Capital Markets
Debt, shall mean the full and final payment in cash, in immediately available
funds, of all of the Senior Capital Markets Debt.

            To the extent any payment of Senior Capital Markets Debt (whether by
or on behalf of the Borrower, as proceeds of security or enforcement of any
right of set-off or otherwise) is declared to be fraudulent or preferential, set
aside or required to be paid to a trustee, receiver or other similar party under
any bankruptcy, insolvency, receivership, fraudulent conveyance or similar laws,
then if such payment is recovered by, or paid over to, such trustee, receiver or
other similar party, the Senior Capital Markets Debt or part thereof originally
intended to be satisfied shall be deemed to be reinstated and outstanding as if
such payment had not occurred. To the extent the obligation to repay any Senior
Capital Markets Debt is declared to be fraudulent, invalid or otherwise set
aside under any bankruptcy, insolvency, receivership, fraudulent conveyance or
similar laws, then the obligations so declared fraudulent, invalid or otherwise
set aside (and all other amounts that would become due with respect thereto had
such obligations not been so affected) shall be deemed to be reinstated and
outstanding as Senior Capital Markets Debt for all purposes hereof as if such
declaration, invalidity or setting aside had not occurred.

            (d) Notwithstanding any other provision of this Agreement, the
Borrower shall have the right to make, and the Subordinated Creditors shall have
the right to receive and to retain, any payment or voluntary prepayment by the
Borrower of any Subordinated Obligation as contemplated by the proviso to
paragraph (i) of subsection 2.1(b) if, immediately after giving

                                      -12-
<PAGE>

CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

effect thereto, there shall not exist a default in the payment or prepayment of
any principal of or interest on any Senior Capital Markets Debt.

            2.2 Additional Subordinated Obligations. A Subordinated Creditor may
cause Schedule A or Schedule B hereto, as the case may be, to be supplemented
from time to time to add additional obligations of the Borrower to the
Subordinated Creditor (or its Subsidiary) as Subordinated Obligations by
executing a notice substantially in the form of Exhibit A hereto and delivering
a signed counterpart thereof to the Borrower. Schedule A and Schedule B, as the
case may be, will be deemed modified as of the date such signed notices have
been delivered.

            2.3 Agreement to Cooperate. Each Subordinated Creditor hereby
agrees, under the circumstances set forth in paragraph (ii) of subsection
2.1(b), duly and promptly to take such action as may be requested at any time
and from time to time by the holders of Senior Capital Markets Debt (or their
representative), to file appropriate proofs of claim in respect of the
Subordinated Obligations, and to execute and deliver such powers of attorney,
assignments of proofs of claim or other instruments as may be requested by the
holders of Senior Capital Markets Debt (or their representative), in order to
enable the holders of Senior Capital Markets Debt to enforce any and all claims
upon or in respect of the Subordinated Obligations and to collect and receive
any and all payments or distributions which may be payable or deliverable at any
time upon or in respect of the Subordinated Obligations.

            2.4 Subrogation. (a) No Subordinated Creditor shall be entitled to
enforce its rights of subrogation to receive payments or distributions of assets
of the Borrower on the Senior Capital Markets Debt until the Senior Capital
Markets Debt has been paid in full.

            (b) Subject to the payment in full of all Senior Capital Markets
Debt, until all amounts owing on the Subordinated Obligations shall be paid in
full the Subordinated Creditors shall be subrogated to the rights of the
holder(s) of the Senior Capital Markets Debt (to the extent of payments or
distributions previously made to such holders pursuant to the provisions of
subsection 2.1(b)).

            2.5 Additional Senior Obligations. (a) For purposes of this
Agreement, "Other Creditor" means a holder of Senior Pari Passu Debt or any
other creditor of the Borrower or a Subsidiary of the Borrower, but does not
include a holder of Senior Capital Markets Debt. No Subordinated Creditor shall
grant or permit to exist any contractual agreement with or for

                                      -13-
<PAGE>

CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

the benefit of any Other Creditor that provides for the subordination of the
payment of any Subordinated Obligation to the payment of obligations of the
Borrower to such Other Creditor unless payment of that Subordinated Obligation
is also subordinated to the payment in full of the Senior Capital Markets Debt
on terms and conditions that are at least as favorable, provided however, that
nothing herein shall (i) be deemed to limit or restrict (A) any Subordinated
Creditor's agreement with any Other Creditor that would prohibit or limit any
payments by the Borrower or any Subsidiary of the Borrower to the Subordinated
Creditor following the occurrence and during the continuance of a non-payment
default with respect to its obligations to the Other Creditor, or (B) any
Subordinated Creditor from undertaking with any Other Creditor to maintain all
or any portion of the Subordinated Obligations outstanding through any specified
minimum maturity date, or (ii) require the granting for the benefit of the
Senior Capital Markets Debt of a provision corresponding to clause (i)(A) or
(B).

            (b) Terms of any subordination of the obligations of the Borrower or
any Subsidiary of the Borrower to any Subordinated Creditor that may from time
to time be established for the benefit of the holders of Senior Capital Markets
Debt pursuant to the terms of subsection (a) of this Section may without the
consent of any holder of Senior Capital Markets Debt be amended on substantially
the same terms and conditions as any amendment of the terms provided to the
relevant Other Creditor or be eliminated to the extent such subordination is
eliminated with respect to the relevant Other Creditor.

                                      -14-
<PAGE>

CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

            2.6 Refinancing of Subordinated Obligations. Neither the Borrower
nor any Subsidiary of the Borrower shall incur or become liable with respect to
any indebtedness owed to any Subordinated Creditor or any Affiliate thereof if
the net proceeds of such indebtedness are used, directly or indirectly, to
refinance any Subordinated Obligations ("Refinancing Indebtedness"), unless such
Refinancing Indebtedness is subordinated to the Senior Capital Markets Debt at
least to the same extent as such refinanced Subordinated Obligations; provided,
however that an incurrence of indebtedness by the Borrower or any Subsidiary of
the Borrower shall not constitute Refinancing Indebtedness under this Agreement
if the Board of Directors of the Borrower makes a good faith determination that
such indebtedness is not Refinancing Indebtedness (such determination being
binding and conclusive for all purposes hereof).

            SECTION 3. REPRESENTATIONS.

            Each Subordinated Creditor represents and warrants as follows:

            3.1 Power and Authority; Authorization; No Violation. The
Subordinated Creditor has corporate power, authority and legal right to execute,
deliver and perform this Agreement, and the execution, delivery and performance
of this Agreement have been duly authorized by all necessary action on its part,
do not require any approval or consent of any trustee or holders of any
indebtedness or obligations of the Subordinated Creditor and will not violate
any provision of law, governmental regulation, order or decree or any provision
of any material indenture, mortgage, contract or other agreement entered into by
the Subordinated Creditor or by which the Subordinated Creditor is bound.

            3.2 Consents. No consent, license, approval or authorization of, or
registration or declaration with, any governmental instrumentality, domestic or
foreign, is required in connection with the execution, delivery and performance
by the Subordinated Creditor of this Agreement.

            3.3 Binding Obligation. This Agreement constitutes a legal, valid
and binding obligation of the Subordinated Creditor enforceable in accordance
with its terms, subject to bankruptcy, insolvency, reorganization, moratorium
and other similar laws affecting creditors' rights generally and to the
availability of equitable remedies.

                                      -15-
<PAGE>

CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

            SECTION 4. MODIFICATIONS OF SENIOR CAPITAL MARKETS DEBT; RELIANCE.

            Each Subordinated Creditor consents that, without the necessity of
any reservation of rights against the Subordinated Creditors, and without notice
to or further assent by the Subordinated Creditors, (a) any demand for payment
of any Senior Capital Markets Debt may be rescinded in whole or in part, and any
Senior Capital Markets Debt may be continued, and the Senior Capital Markets
Debt, or the liability of any other party upon or for any part thereof, or any
collateral security or guaranty therefor, or right of offset with respect
thereto, may, from time to time, in whole or in part, be renewed, extended,
modified, accelerated, compromised, waived, surrendered, or released and (b) any
document or instrument evidencing or governing the term of any Senior Capital
Markets Debt or any other collateral security documents or guaranties or
documents in connection with Senior Capital Markets Debt (other than this
Agreement) may be amended, modified, supplemented or terminated, in whole or in
part, as the holders of Senior Capital Markets Debt may deem advisable from time
to time, the manner, place or terms of payment or time of payment of the Senior
Capital Markets Debt may be amended or supplemented, any collateral security at
any time held by the holders of Senior Capital Markets Debt for the payment of
any of the Senior Capital Markets Debt may be sold, exchanged, waived,
surrendered or released, in each case, except as provided above, all without
notice to or further assent by any Subordinated Creditor, and all without
impairing, abridging, releasing or affecting the subordination provided for
herein, notwithstanding any such renewal, extension, modification, acceleration,
compromise, amendment, supplement, termination, sale, exchange, waiver,
surrender or release. Each Subordinated Creditor waives any and all notice of
the creation, modification, renewal, extension, alteration, supplement or
accrual of any of the Senior Capital Markets Debt and notice of or proof of
reliance by the holders of Senior Capital Markets Debt upon this agreement, and
the Senior Capital Markets Debt and any of them shall conclusively be deemed to
have been created, contracted or incurred in reliance upon this Agreement. Each
Subordinated Creditor acknowledges and agrees that the holders of Senior Capital
Markets Debt have relied upon the subordination provided for herein in making
funds available to the Borrower under the terms of such Senior Capital Markets
Debt. Except as otherwise provided in this Agreement, each Subordinated Creditor
waives notice or proof of reliance on this Agreement and protest, demand for
payment and notice of default.

            SECTION 5. MISCELLANEOUS.

                                      -16-
<PAGE>

CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

            5.1 Binding Effect. This Agreement shall be binding upon and inure
to the benefit of the successors and assigns of the parties hereto.

            5.2 Further Assurances. Each Subordinated Creditor, at its own
expense and at any time from time to time, upon the written request of Borrower
will promptly and duly execute and deliver such further instruments and
documents and take such further actions as the Borrower reasonably may request
for the purposes of assuring that the holders of Senior Capital Markets Debt
obtain or preserve the full benefits of this Agreement and of the rights and
powers herein granted.

            5.3 Provisions Define Relative Rights. This Agreement is intended
solely for the purpose of defining the relative rights of the Senior Capital
Markets Debt, on the one hand and the Subordinated Creditors on the other, and
no other Person shall have any right, benefit or other interest under this
Agreement.

            5.4 Notices. All notices, requests and demands hereunder to or upon
the holders of Senior Capital Markets Debt, the Subordinated Creditors or the
Borrower to be effective shall be in writing (or by fax or similar electronic
transfer confirmed in writing) and shall be deemed to have been duly given or
made (a) when delivered by hand or (b) if given by mail, when deposited in the
mails by certified mail, return receipt requested, or (c) if by fax or similar
electronic transfer, when sent and receipt has been confirmed, addressed as
follows:

         If to SBC or an
         SBC Subsidiary:         175 East Houston Street
                                 San Antonio Texas 78205
                                 Attention: Vice President-Treasurer
                                 Fax: 210-351-3849

         If to BellSouth or a
         BellSouth Subsidiary:   1155 Peachtree Street
                                 Atlanta, Georgia 30309-4599
                                 Attention: Vice President & Treasurer
                                 Fax: 404-249-2658

                                      -17-
<PAGE>

CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

         If to the Borrower:     5565 Glenridge Connector
                                 Suite 1200
                                 Atlanta, Georgia 30342
                                 Attention: Vice President & Treasurer
                                 Fax: 404-236-6008

            If to the holders of Senior Capital Markets Debt, to the addresses
specified in the instruments governing their terms (which in the case of Senior
Capital Markets Debt issued pursuant to an indenture shall be the address for
notices to the trustee thereof).

            The parties to this Agreement may change their addresses and
transmission numbers for notices by notice to the other parties in the manner
provided in this Section.

            5.5 Governing Law. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED
AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

            5.6 Severability. All rights, powers and remedies provided herein
may be exercised only to the extent that the exercise thereof does not violate
any applicable provisions of law and are intended to be limited to the extent
necessary so that they will not render this Agreement invalid or unenforceable.
If any term of this Agreement or any application thereof shall be invalid or
unenforceable, the remainder of this Agreement and any other application of such
term shall not be affected thereby.

            5.7 Controlling Agreement; Termination. Unless and until all Senior
Capital Markets Debt has been paid in full, notwithstanding the provisions in
the Subordinated Obligations, the provisions of this Agreement shall be
controlling as to the matters set forth herein. This Agreement shall terminate
and have no further force or effect on and as of the earlier of the date that
the Senior Capital Markets Debt has been paid in full or the date that the
Subordinated Obligations have been paid in full.

            5.8 Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be an original, but all of which together
shall constitute one instrument.

            5.9 Limitations on Amendment. So long as any Senior Capital Markets
Debt is outstanding, no modification, supplement or waiver of any provision of
this Agreement that would be materially adverse to any holder of Senior Capital
Markets Debt

                                      -18-
<PAGE>

CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

shall be effective with respect to the holder of any outstanding Senior Capital
Markets Debt so affected unless expressly agreed to in writing by such holder
(or such holder's representative, which in the case of any Senior Capital
Markets Debt issued pursuant to an indenture shall be the trustee thereunder),
provided, however, that no consent of any holder of outstanding Senior Capital
Markets Debt shall be required to permit (a) amendment or elimination of any
provision in accordance with Section 2.5(b), or (b) amendment of any provision
of this Agreement in a manner substantially identical to any amendment,
modification, supplement or waiver of a substantially identical provision
contained in the Initial Subordination Agreement that was made with the consent
of the Administrative Agent (acting with the approval of the Required Lenders
(as defined in the Credit Agreement)).

            5.10 Representatives. Each Subsidiary Lender that is a subsidiary of
SBC hereby appoints SBC as its agent and attorney-in-fact (a) for all purposes
under this Agreement, including agreement to waivers and amendments, and (b) to
execute and deliver other agreements pertaining to subordination of Shareholder
Loans. Each Subsidiary Lender that is a subsidiary of BellSouth hereby appoints
BellSouth as its agent and attorney-in-fact (a) for all purposes under this
Agreement, including agreement to waivers and amendments, and (b) to execute and
deliver other agreements pertaining to subordination of Shareholder Loans.

                                      -19-
<PAGE>

CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

            IN WITNESS WHEREOF, each party hereto has caused this Agreement to
be duly executed, all as of the date and year first above written.

                                                 CINGULAR WIRELESS LLC
                                                 By: Cingular Wireless
                                                       Management Corp.

                                                 By: /s/ Sean Foley
                                                    ----------------------------
                                                 Name: Sean Foley
                                                 Title: Vice President &
                                                        Treasurer

                                                 BELLSOUTH CORPORATION

                                                 By: /s/ Linda S. Harty
                                                    ----------------------------
                                                 Name: Linda S. Harty
                                                 Title: Vice President &
                                                        Treasurer

                                                 BELLSOUTH CELLULAR CORP.

                                                 By: /s/ Arthur B. Hillman
                                                    ----------------------------
                                                 Name: Arthur B. Hillman
                                                 Title: Vice President

                                                 CELLULAR CREDIT CORPORATION

                                                 By: /s/ Linda S. Bubacz
                                                    ----------------------------
                                                 Name: Linda S. Bubacz
                                                 Title: Vice President and
                                                        Treasurer

                                      -20-
<PAGE>

CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

                                                 SBC COMMUNICATIONS INC.

                                                 By: /s/ Michael J. Viola
                                                    ----------------------------
                                                 Name: Michael J. Viola
                                                 Title: Vice President-Treasurer

                                      -21-
<PAGE>

CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

                                                                      Schedule A

<TABLE>
<CAPTION>
                                                                                                   Original
                                                          Original Stated                          Stated
Debtor            Original Lender      Current Holder     Principal Amount       Date of Loan      Maturity Date
------            ---------------      --------------     ----------------       ------------      -------------
<S>               <C>                  <C>                <C>                    <C>               <C>
Alloy LLC         SBC                  SBC
                  Communications       Communications     $10,000,000,000        10/02/2000        payable on
                  Inc.                 Inc.                                                        demand

Alloy LLC         SBC                  SBC
                  Communications       Communications     $     1,200,000        06/01/2000        payable on
                  Inc.                 Inc.                                                        demand
</TABLE>

                                      A-1
<PAGE>

CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

                                                                      Schedule B

<TABLE>
<CAPTION>
                                                                                                       Original
                                                                Original Stated                         Stated
     Debtor             Original Lender      Current Holder     Principal Amount    Date of Loan     Maturity Date
     ------             ---------------      --------------     ----------------    ------------     -------------
<S>                     <C>                 <C>                 <C>                 <C>               <C>
BellSouth               BellSouth           Cellular Credit
Mobility Inc.           Cellular Corp.      Corporation         $    334,270,706      01/01/1998       12/31/2002

American Cellular
Communications          BellSouth           Cellular Credit
Corporation             Cellular Corp.      Corporation         $  1,200,726,948      01/01/1998       12/31/2002

Alabama Cellular        BellSouth           Cellular Credit
Service, Inc.           Mobility Inc.       Corporation         $    114,626,911      01/01/1998       12/31/2002

Florida Cellular        BellSouth           Cellular Credit
Service, Inc.           Mobility Inc.       Corporation         $    275,785,878      01/01/1998       12/31/2002

Kentucky CGSA, Inc.     BellSouth           Cellular Credit
                        Mobility Inc.       Corporation         $     75,160,458      01/01/1998       12/31/2002

Louisiana CGSA, Inc.    BellSouth           Cellular Credit
                        Mobility Inc.       Corporation         $     96,739,745      01/01/1998       12/31/2002

Jackson Cellular        Jackson             Cellular Credit
Corporation             Acquisition Corp.   Corporation         $     24,232,685      01/01/1998       12/31/2002

Orlando CGSA, Inc.      BellSouth           Cellular Credit
                        Mobility Inc.       Corporation         $    120,834,100      01/01/1998       12/31/2002

South Carolina          BellSouth           Cellular Credit
Cellular Service, Inc.  Mobility Inc.       Corporation         $     27,284,909      01/01/1998       12/31/2002

Anniston-Westel         American Cellular
Company, Inc.           Communications      Cellular Credit
                        Corp.               Corporation         $     44,142,555      01/01/1998       12/31/2002

Northeast Mississippi   BellSouth           Cellular Credit
Cellular, Inc.          Mobility Inc.       Corporation         $     17,225,359      01/01/1998       12/31/2002

Huntsville Cellular     BellSouth           Cellular Credit
Telephone Corp., Inc.   Cellular Corp.      Corporation         $      3,028,690      01/01/1998       12/31/2002
</TABLE>

                                      B-1
<PAGE>

CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

<TABLE>
<S>                     <C>                 <C>                 <C>                 <C>               <C>
Westel-Milwaukee        American Cellular
Company, Inc.           Communications      Cellular Credit
                        Corp.               Corporation         $    348,023,837      01/01/1998       12/31/2002

Westel Richmond, Inc.   American Cellular
                        Communications      Cellular Credit
                        Corp.               Corporation         $     22,249,316      01/01/1998       12/31/2002

Georgia Cellular        American Cellular
Corporation             Communications      Cellular Credit
                        Corp.               Corporation         $    123,974,362      01/01/1998       12/31/2002

Georgia Cellular        American Cellular
Holdings, Inc.          Communications      Cellular Credit
                        Corp.               Corporation         $      1,791,869      01/01/1998       12/31/2002

Gary Cellular           American Cellular
Corporation             Communications      Cellular Credit
                        Corp.               Corporation         $      1,840,302      01/01/1998       12/31/2002

Westel-Indianapolis     American Cellular
Company                 Communications      Cellular Credit
                        Corp.               Corporation         $     58,280,003      01/01/1998       12/31/2002

Indiana Cellular        American Cellular
Communications          Communications      Cellular Credit
                        Corp.               Corporation         $      5,164,717      01/01/1998       12/31/2002

BellSouth Personal      BellSouth           BellSouth                                                  payable on
Communications Inc.     Corporation         Corporation         $    886,706,000      09/27/2000       demand

Alloy LLC               BellSouth           BellSouth                                                  payable on
                        Corporation         Corporation         $        800,000      06/01/2000       demand
</TABLE>

                                      B-2
<PAGE>

CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

<TABLE>
<S>                     <C>                 <C>                 <C>                   <C>              <C>
BellSouth Personal      Cellular Credit     Cellular Credit                                            payable on
Communications Inc.     Corporation         Corporation         $   *                 01/14/2000       demand
</TABLE>

----------
*     No specific principal amount. The original stated principal amount of the
      note is for all working capital loans made by Cellular Credit Corporation.

                                      B-3
<PAGE>

CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

                                                                       Exhibit A

                [FORM OF NOTICE OF ADDITIONAL SUBORDINATED DEBT]

Cingular Wireless LLC
[Address]

Re: Designation of Additional Subordinated Obligation

Ladies and Gentlemen:

            The undersigned hereby designates the following loan which has been
extended by the undersigned to you or your Subsidiary as a Subordinated
Obligation under the Subordination and Extension Agreement, dated as of November
20, 2000, as amended [include reference to any similar subordination agreement
relating to Senior Pari Passu Debt], and the Capital Markets Debt Subordination
Agreement, dated as of November 21, 2000:

                                 [describe debt]

            The foregoing description is hereby deemed added to Schedule [A] [B]
of such Subordination and Extension Agreement and such Capital Markets Debt
Subordination Agreement. [The undersigned hereby agrees that it shall be deemed
a Subsidiary Lender under such Subordination and Extension Agreement and such
Capital Markets Debt Subordination Agreement with respect to the
above-referenced debt.]*

                                               Very truly yours,

                                               [SBC COMMUNICATIONS INC.]
                                               [BellSouth CORPORATION]
                                               [SUBSIDIARY LENDER]
cc: [Trustee]

----------
*     Insert if delivered with respect to loan by subsidiary of SBC or
      BellSouth.

<PAGE>

CINGULAR WIRELESS                                                  Exhibit 10.13
EXHIBITS

                                                                       Exhibit B

           [FORM OF NOTICE OF ADDITIONAL SENIOR CAPITAL MARKETS DEBT]

Cingular Wireless LLC
[Address]

Re: Approval of Additional Senior Capital Markets Debt

Ladies and Gentlemen:

            The undersigned hereby approves the following obligation that you
propose to issue or have issued as "Senior Capital Markets Debt" under the
Subordination and Extension Agreement, dated as of November 20, 2000, as amended
[include reference to any similar subordination agreement relating to Senior
Pari Passu Debt], and the Capital Markets Debt Subordination Agreement, dated as
of November 21, 2000:

                              [describe obligation]

                                                       Very truly yours,

                                                       [SBC COMMUNICATIONS INC.]
[BellSouth CORPORATION]

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