UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                 SCHEDULE 13D/A

                    Under the Securities Exchange Act of 1934
                                (Amendment No. 2)

                         SunCom Wireless Holdings, Inc.
                      (formerly, Triton PCS Holdings, Inc.)
                                (Name of Issuer)

                 Class A Common Stock, par value $0.01 per share

                         (Title of Class of Securities)

                                   86722Q 10 8

                                 (CUSIP Number)

                                 David D. Clark
                         SunCom Wireless Holdings, Inc.
                                1100 Cassatt Road
                    Berwyn, Pennsylvania 19312 (610) 651-5900

 (Name, Address and Telephone Number of Person Authorized to Receive Notices 
                              and Communications)

                                   May 4, 2005

             (Date of Event Which Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  that is the subject of this  Schedule  13D, and is filing this
schedule because of ss.  240.13d-1(e),  240.13d-1(f) or 240.13d-1(g),  check the
following  box.  

The  information  required in 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.

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1            NAMES OF REPORTING PERSONS
             I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) 

             Michael E. Kalogris
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2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP         (a) ____
                                                                      (b) ____
             Not Applicable
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3            SEC USE ONLY

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4            SOURCE OF FUNDS (See Instructions)

             PF
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5            CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
             ITEM 2(d) OR 2(e)

             Not Applicable                                  _________________
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6            CITIZENSHIP OR PLACE OF ORGANIZATION 

             United States of America
------------------------------------------------------------------------------
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                                7       SOLE VOTING POWER

                                        3,459,339 (*)(**)
                                        --------------------------------------
                                        --------------------------------------
    
    NUMBER OF                   8       SHARED VOTING POWER
     SHARES
  BENEFICIALLY                          - 0 -
    OWNED BY                            --------------------------------------
      EACH                              --------------------------------------
   REPORTING
    PERSON                      9       SOLE DISPOSITIVE POWER
     WITH
                                        3,396,162 *
                                        --------------------------------------
                                        --------------------------------------

                                10      SHARED DISPOSITIVE POWER

                                        63,177 **
------------------------------------------------------------------------------
------------------------------------------------------------------------------
11           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 

             3,459,339
------------ -----------------------------------------------------------------
------------ -----------------------------------------------------------------
12           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
             SHARES (See Instructions) 

             Not Applicable                                   ________________
------------ -----------------------------------------------------------------
------------ -----------------------------------------------------------------
13           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 

             5.6%***
------------ -----------------------------------------------------------------
------------ -----------------------------------------------------------------
14           TYPE OF REPORTING PERSON (See Instructions) 

             IN
------------ -----------------------------------------------------------------
------------ -----------------------------------------------------------------


*     Includes 682,500 shares that are subject to forfeiture.

**    Includes  63,177  shares held under an amended and  restated  common  
      stock trust agreement for management employees and independent directors,
      of which Mr. Kalogris is trustee.  Mr. Kalogris disclaims beneficial 
      ownership of the shares held by the trust.

***   Based on the 61,901,546 shares of Class A Common Stock outstanding as of 
      April 29, 2005, as stated on the facing page of the Form 10-Q of SunCom 
      Wireless Holdings, Inc. for the fiscal quarter ended March 31, 2005.


Item 1.      Security and Issuer.

     Michael E. Kalogris hereby files this Amendment No. 2 to Schedule 13D (this
"Amendment")  to amend the Schedule 13D (filed with the  Securities and Exchange
Commission (the "Commission") on May 28, 2004), as amended by Amendment No. 1 to
Schedule 13D (filed with the Commission on August 9, 2004) (the original  filing
on Schedule  13D,  together  with  Amendment  Nos. 1 and 2 to  Schedule  13D are
collectively referred to herein as the "Schedule 13D"). The Schedule 13D relates
to the Class A Common Stock, par value $0.01 per share (the "Common Stock"), of
SunCom  Wireless  Holdings,  Inc.  (the  "Issuer").  On May 4, 2005,  the Issuer
changed its  corporate  name from Triton PCS Holdings,  Inc. to SunCom  Wireless
Holdings,  Inc. The Issuer's principal offices are located at 1100 Cassatt Road,
Berwyn,  Pennsylvania  19312.  Except as modified  herein,  the  Schedule 13D is
unmodified.


                                     - 2 -


Item 2.      Identity and Background.

         (a)      Michael E. Kalogris

         (b)      Business address:
                  c/o SunCom Wireless Management Company, Inc.
                  1100 Cassatt Road
                  Berwyn, Pennsylvania 19312

         (c)      Mr. Kalogris is presently the Chairman of the Board of 
                  Directors and the Chief  Executive  Officer of SunCom 
                  Wireless Holdings, Inc. located at 1100 Cassatt Road, 
                  Berwyn, Pennsylvania 19312.

         (d)      Mr.  Kalogris  has not,  during the last five years,  been
                  convicted  of a criminal  proceeding  (excluding  traffic
                  violations or similar misdemeanors).

         (e)      Mr. Kalogris has not, during the last five years,  been a 
                  party to a civil proceeding of a judicial or administrative
                  body of competent  jurisdiction  and as a result of such  
                  proceeding  been  subjected to a judgment,  decree or final
                  order enjoining future violations of, or prohibiting or 
                  mandating  activities subject to, federal or state securities
                  laws upon the finding of any violation with respect to such 
                  laws.

         (f)      Mr. Kalogris is a citizen of the United States of America.


Item 3.      Source and Amount of Funds or Other Consideration.

     Mr. Kalogris  acquired his shares of Common Stock through a combination of:
(i)  purchases of shares in  connection  with the  founding,  formation and
initial  funding of the  Issuer and its  subsidiaries;  (ii)  limited  open
market purchases following the Issuer's initial public offering;  (iii) the
Issuer's  Employee Stock Purchase Plan; and (iv) awards of restricted stock.
Mr.  Kalogris  used  personal  funds to purchase the shares of Common Stock
described in clauses (i), (ii) and (iii).


Item 4.      Purpose of Transaction.

    Mr. Kalogris has no present plans or proposals that relate to or would
result in any of the actions specified in clauses (a) through (j) of Item 4
of Schedule 13D.  However,  Mr.  Kalogris  reserves the right to propose or 
participate in future  transactions which may result in one or more of such
actions,   including  but  not  limited  to,  an  extraordinary   corporate
transaction  such as a merger,  reorganization  or  liquidation,  sale of a
material  amount  of assets of the  Issuer  or its  subsidiaries,  or other
transactions  which  might have the effect of causing the  Issuer's  Common
Stock to cease to be listed on a national  securities  exchange  or causing
the Common Stock to become eligible for termination of registration,  under
Section 12(g) of the Exchange Act.


Item 5.      Interest in Securities of the Issuer.

    The aggregate number of shares of the Issuer's Common Stock beneficially
owned by Mr. Kalogris is 3,459,339, which represents 5.6% of the issued and
outstanding  shares of the Issuer's  Common Stock as of April 29, 2005. Mr.
Kalogris  has the power to vote  3,459,339  shares of the  Issuer's  Common
Stock and the power to dispose of 3,396,162  shares of the Issuer's  Common
Stock. He may be deemed to share  dispositive  power with respect to 63,177
shares  of the  Issuer's  Common  Stock  held in  trust,  but he  disclaims


                                     - 3 -



beneficial ownership of all such shares. More specifically, as trustee, Mr.
Kalogris  has sole  voting  power with  respect  to the shares  held by the
trust. However, disposition of shares from the trust is accomplished by the
Issuer delivering a distribution  schedule to Mr. Kalogris, in his capacity
as trustee,  setting  forth the  recipients of shares held by the trust and
the  number of shares to be  distributed  from the trust in respect of each
recipient.  Mr.  Kalogris,  as  Chairman  of the Board and Chief  Executive
Officer  of the  Issuer,  may be deemed to share  dispositive  power to the
extent  of  his  participation  in  determining  the  trust's  distribution
schedule.

    On May 25, 2005, the Compensation Committee of the Issuer's  Board of
Directors  approved  an award of  227,500  shares  of  Common  Stock to Mr.
Kalogris under the Issuer's  Amended and Restated Stock and Incentive Plan,
which shares vest  ratably  over three years and are subject to  forfeiture
under an employment agreement.

    No person other than Mr. Kalogris has the right to receive or the
power to direct the receipt of dividends from or the proceeds from the
sale of Common Stock owned beneficially by Mr. Kalogris.

Item 6.      Contracts, Arrangements, Understandings or Relationships With 
             Respect to Securities of the Issuer.

    The  disclosure  under this Item 6 in the  Schedule 13D is hereby
incorporated  by this  reference  and amended by adding the  following
paragraphs to the end of such disclosure.

    On July 7, 2004, the Issuer  entered into a definitive  agreement
with Cingular  Wireless LLC,  AT&T  Wireless  Services,  Inc. and AT&T
Wireless  PCS LLC (the  "Holdings  Agreement")  pursuant to which AT&T
Wireless  Services  agreed  to  surrender  to  the  Issuer  all of the
Issuer's stock owned by AT&T Wireless Services,  including  786,252.64
shares of the Issuer's Series A Preferred Stock and 543,683.47  shares
of the  Issuer's  Series D Preferred  Stock  (collectively,  the "AT&T
Owned Stock") upon and subject to the  consummation of the acquisition
of AT&T  Wireless  Services  by Cingular  Wireless  and subject to the
satisfaction of certain other closing conditions. On October 26, 2004,
Cingular  Wireless  consummated  its  acquisition  of  AT&T  Wireless
Services,  and AT&T Wireless Services surrendered to the Issuer all of
the AT&T Owned Stock.

    Upon the  surrender of the AT&T Owned Stock,  the Issuer's  First
Amended and Restated Stockholders' Agreement, as amended,  terminated.
Separately,   the  Investors  Stockholders'  Agreement,  dated  as  of
February 4, 1998, as amended,  by and among the Issuer's  initial cash
equity investors and certain of its management stockholders, including
Mr. Kalogris, terminated pursuant to its terms upon termination of the
First Amended and Restated Stockholders' Agreement, as amended.

    The   Holdings   Agreement,   the  First   Amended  and  Restated
Stockholders' Agreement, as amended, including all amendments thereto,
and the  Investors  Stockholders'  Agreement,  dated as of February 4,
1998, as amended, including all amendments thereto, were each filed as
exhibits to Amendment No. 1 to Schedule 13D.


                                     - 4 -



                                    SIGNATURE

     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.



  July 6, 2005                         By: /s/Michael E. Kalogris
---------------                            -----------------------------------
     Date                                  Michael E. Kalogris