SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549

                                  SCHEDULE 13G
                                 (Rule 13d-102)

           INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO
            RULES 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED
                            PURSUANT TO RULE 13d-2(b)




                               AGERE SYSTEMS INC.
--------------------------------------------------------------------------------
                                (Name of Issuer)


                      Class A Common Stock, $0.01 par value
--------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                    00845V100
--------------------------------------------------------------------------------
                                 (CUSIP Number)


                                December 31, 2002
--------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

     [X]          Rule 13d-1(b)

     [ ]          Rule 13d-1(c)

     [ ]          Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).



                                     1 of 9


---------------------                                   ------------------------
CUSIP No. 00845V100                   13G
---------------------                                   ------------------------

--------------------------------------------------------------------------------
      1        NAME OF REPORTING PERSONS
               I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

               Maverick Capital, Ltd. - 75-2482446
--------------------------------------------------------------------------------
      2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a)  [ ]
                                                                      (b)  [ ]
--------------------------------------------------------------------------------
      3        SEC USE ONLY

--------------------------------------------------------------------------------
      4        CITIZENSHIP OR PLACE OF ORGANIZATION

               Texas
--------------------------------------------------------------------------------
                                5        SOLE VOTING POWER

                                         48,531,800
       NUMBER OF              --------------------------------------------------
         SHARES                 6        SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                         0
          EACH                --------------------------------------------------
       REPORTING                7        SOLE DISPOSITIVE POWER
      PERSON WITH
                                         48,531,800
                              --------------------------------------------------
                                8        SHARED DISPOSITIVE POWER

                                         0
--------------------------------------------------------------------------------
      9        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

               48,531,800
--------------------------------------------------------------------------------
     10        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
               SHARES*
                                                                             [ ]
--------------------------------------------------------------------------------
     11        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

               6.5%
--------------------------------------------------------------------------------
     12        TYPE OF REPORTING PERSON*

               IA
--------------------------------------------------------------------------------

        * SEE INSTRUCTIONS BEFORE FILLING OUT

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---------------------                                   ------------------------
CUSIP No. 00845V100                   13G
---------------------                                   ------------------------

--------------------------------------------------------------------------------
      1        NAME OF REPORTING PERSONS
               I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

               Maverick Capital Management, LLC - 75-2686461
--------------------------------------------------------------------------------
      2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a)  [ ]
                                                                        (b)  [ ]
--------------------------------------------------------------------------------
      3        SEC USE ONLY

--------------------------------------------------------------------------------
      4        CITIZENSHIP OR PLACE OF ORGANIZATION

               Texas
--------------------------------------------------------------------------------
                                5        SOLE VOTING POWER

                                         48,531,800
       NUMBER OF              --------------------------------------------------
         SHARES                 6        SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                         0
          EACH                --------------------------------------------------
       REPORTING                7        SOLE DISPOSITIVE POWER
      PERSON WITH
                                         48,531,800
                              --------------------------------------------------
                                8        SHARED DISPOSITIVE POWER

                                         0
--------------------------------------------------------------------------------

      9        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

               48,531,800
--------------------------------------------------------------------------------
     10        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
               SHARES*
                                                                             [ ]
--------------------------------------------------------------------------------
     11        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

               6.5%
--------------------------------------------------------------------------------
     12        TYPE OF REPORTING PERSON*

               HC
--------------------------------------------------------------------------------

         *SEE INSTRUCTIONS BEFORE FILLING OUT




---------------------                                   ------------------------
CUSIP No. 00845V100                   13G
---------------------                                   ------------------------


--------------------------------------------------------------------------------
      1        NAME OF REPORTING PERSONS
               I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

               Lee S. Ainslie III
--------------------------------------------------------------------------------
      2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a)  [ ]
                                                                        (b)  [ ]
--------------------------------------------------------------------------------
      3        SEC USE ONLY

--------------------------------------------------------------------------------
      4        CITIZENSHIP OR PLACE OF ORGANIZATION

               United States
--------------------------------------------------------------------------------
                                5        SOLE VOTING POWER

                                         48,531,800
       NUMBER OF              --------------------------------------------------
         SHARES                 6        SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                         0
          EACH                --------------------------------------------------
       REPORTING                7        SOLE DISPOSITIVE POWER
      PERSON WITH
                                         48,531,800
                              --------------------------------------------------
                                8        SHARED DISPOSITIVE POWER

                                         0
--------------------------------------------------------------------------------
      9        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

               48,531,800
--------------------------------------------------------------------------------
     10        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
               SHARES*
                                                                             [ ]
--------------------------------------------------------------------------------
     11        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

               6.5%
--------------------------------------------------------------------------------
     12        TYPE OF REPORTING PERSON*

               HC
--------------------------------------------------------------------------------

         *SEE INSTRUCTIONS BEFORE FILLING OUT


                                     4 of 9





ITEM 1(a)         NAME OF ISSUER.

                  Agere Systems Inc.

ITEM 1(b)         ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES.

                  555 Union Blvd.
                  Allentown, Pennsylvania 18109

ITEM 2(a)         NAME OF PERSON FILING.

     This Schedule 13G (the "Schedule 13G") is being filed on behalf of each of
     the following persons (each, a "Reporting Person"):


                  (i)      Maverick Capital, Ltd.;

                  (ii)     Maverick Capital Management, LLC; and

                  (iii)    Lee S. Ainslie III ("Mr. Ainslie").

                  The Schedule 13G relates to Shares (as defined herein) held
                  for the accounts of Maverick Capital, Ltd.'s clients.

ITEM 2(b)         ADDRESS OF PRINCIPAL BUSINESS OFFICE, OR, IF NONE, RESIDENCE.

                  The address of the principal business office of (i) Maverick
                  Capital, Ltd. and Maverick Capital Management, LLC is 300
                  Crescent Court, 18th Floor, Dallas, Texas 75201, and (ii) Mr.
                  Ainslie is 767 Fifth Avenue, 11th Floor, New York, New York
                  10153.

ITEM 2(c)         CITIZENSHIP OR PLACE OF ORGANIZATION.

                  (i)      Maverick Capital, Ltd. is a Texas limited
                           partnership;

                  (ii)     Maverick Capital Management, LLC is a Texas limited
                           liability company; and

                  (iii)    Mr. Ainslie is a citizen of the United States.

ITEM 2(d)         TITLE OF CLASS OF SECURITIES.

                  Class A Common Stock, $0.01 par value (the "Shares").

ITEM 2(e)         CUSIP NUMBER.

                  00845V100



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ITEM 3.           IF THIS STATEMENT IS FILED PURSUANT TO SECTIONS 240.13d-1(b)
                  OR 240.13d-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A:

     (a)   [ ]    Broker or dealer registered under section 15 of the Act (15
                  U.S.C. 78o).

     (b)   [ ]    Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

     (c)   [ ]    Insurance company as defined in section 3(a)(19) of the Act
                  (15 U.S.C. 78c).

     (d)   [ ]    Investment company registered under section 8 of the
                  Investment Company Act of 1940 (15 U.S.C. 80a-8).

     (e)   [X]    An investment advisor in accordance with Section
                  240.13d-1(b)(1)(ii)(E).

     (f)   [ ]    An employee benefit plan or endowment fund in accordance with
                  Section 240.13d-1(b)(1)(ii)(F).

     (g)   [X]    A parent holding company or control person in accordance with
                  Section 240.13d-1(b)(1)(ii)(G).

     (h)   [ ]    A savings association as defined in Section 3(b) of the
                  Federal Deposit Insurance Act (12 U.S.C. 1813).

     (i)   [ ]    A church plan that is excluded from the definition of an
                  investment company under Section 3(c)(14) of the Investment
                  Company Act of 1940 (15 U.S.C. 80a-3).

     (j)   [ ]    Group, in accordance with Section 240.13d-1(b)(1)(ii)(J).

ITEM 4            OWNERSHIP.

     Ownership as of December 31, 2002 is incorporated by reference to items (5)
     - (9) and (11) of the cover page of the Reporting Person.


ITEM 5            OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.


                  Not applicable.

ITEM 6            OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER
                  PERSON.

                  Maverick Capital, Ltd. is an investment adviser registered
                  under Section 203 of the Investment Advisers Act of 1940 and,
                  as such, has beneficial ownership of the Shares which are the
                  subject of this filing through the investment discretion it
                  exercises over its clients' accounts. Maverick Capital
                  Management, LLC is the General Partner of Maverick Capital,
                  Ltd. Mr. Ainslie is a manager of Maverick Capital Management,
                  LLC and is granted sole investment discretion pursuant to
                  Maverick Capital Management, LLC's Regulations.

ITEM 7            IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
                  ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING
                  COMPANY.

                  Not applicable.


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ITEM 8            IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

                  Not applicable.

ITEM 9            NOTICE OF DISSOLUTION OF GROUP.

                  Not applicable.

ITEM 10           CERTIFICATION.

                  By signing below each of the Reporting Persons certifies that,
                  to the best of such person's knowledge and belief, the
                  securities referred to above were acquired and are held in the
                  ordinary course of business and were not acquired and are not
                  held for the purpose of or with the effect of changing or
                  influencing the control of the issuer of the securities and
                  were not acquired and are not held in connection with or as a
                  participant in any transaction having that purpose or effect.

                                   SIGNATURES

         After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.


Date:  February 13, 2003          MAVERICK CAPITAL, LTD.

                                  By:  Maverick Capital Management, LLC,
                                       Its General Partner

                                       By: Lee S. Ainslie III, Manager

                                           By:  /s/ John T. McCafferty
                                                --------------------------------
                                                John T. McCafferty
                                                Under Power of Attorney dated
                                                February 13, 2003, filed
                                                herewith as Exhibit B

Date:  February 13, 2003          MAVERICK CAPITAL MANAGEMENT, LLC

                                  By:     Lee S. Ainslie III, Manager

                                          By:    /s/ John T. McCafferty
                                                 -------------------------------
                                                 John T. McCafferty
                                                 Under Power of Attorney dated
                                                 February 13, 2003, filed
                                                 herewith as Exhibit B



                                     7 of 9


Date:  February 13, 2003          LEE S. AINSLIE III


                                  By: /s/ John T. McCafferty
                                      ----------------------------------------
                                      John T. McCafferty
                                      Under Power of Attorney dated February 13,
                                      2003, filed herewith as Exhibit B


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                                  EXHIBIT INDEX

A.       Joint Filing Agreement, dated as of February 13, 2003, by and among
         Maverick Capital, Ltd., Maverick Capital Management, LLC, and Lee S.
         Ainslie III.

B.       Power of Attorney, dated February 13, 2003, granted by Mr. Lee S.
         Ainslie III in favor of Mr. John T. McCafferty.



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