================================================================================

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

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                                (Amendment No. 7)


                                  TRINSIC, INC.
                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)

                                    988792107
                                 (CUSIP Number)

                               LAWRENCE C. TUCKER
                          Brown Brothers Harriman & Co.
                                  140 Broadway
                               New York, New York
                                 (212) 483-1818
                     (Name, Address and Telephone Number of
                      Person Authorized to Receive Notices
                               and Communications)

                               September 29, 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 which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].

*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).

================================================================================



CUSIP No. 988792107                SCHEDULE 13D              Page 2 of 9 Pages
--------------------------------------------------------------------------------

1    NAME OF REPORTING PERSON

     THE 1818 FUND III, L.P.
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP              (a)    [X]
                                                                   (b)    [_]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    SOURCE OF FUNDS

     OO
--------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEMS 2(D) OR 2(E)                                                   
                                                                          [_]
--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     DELAWARE
--------------------------------------------------------------------------------

              NUMBER OF                        
                                    7     SOLE VOTING POWER        
               SHARES       
                                          -0-                                 
            BENEFICIALLY        ------------------------------------------------
                                    8     SHARED VOTING POWER                  
              OWNED BY                                              
                                          2,699,395 See Item 5              
                EACH            ------------------------------------------------
                                    9     SOLE DISPOSITIVE POWER              
              REPORTING                                             
                                          -0-                              
               PERSON           ------------------------------------------------
                                    10    SHARED DISPOSITIVE POWER            
                WITH                                                
                                          2,699,395 See Item 5
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     2,699,395 See Item 5.
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES  

                                                                          [_]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     48.3%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON

     PN
--------------------------------------------------------------------------------



CUSIP No. 988792107                SCHEDULE 13D              Page 3 of 9 Pages
--------------------------------------------------------------------------------

1    NAME OF REPORTING PERSON

     BROWN BROTHERS HARRIMAN & CO.
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP              (a)    [X]
                                                                   (b)    [_]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    SOURCE OF FUNDS

     OO
--------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEMS 2(D) OR 2(E)                                                   
                                                                          [_]
--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     NEW YORK
--------------------------------------------------------------------------------

              NUMBER OF                        
                                    7     SOLE VOTING POWER        
               SHARES       
                                          -0-                                 
            BENEFICIALLY        ------------------------------------------------
                                    8     SHARED VOTING POWER                  
              OWNED BY                                              
                                          2,699,395 See Item 5              
                EACH            ------------------------------------------------
                                    9     SOLE DISPOSITIVE POWER              
              REPORTING                                             
                                          -0-                              
               PERSON           ------------------------------------------------
                                    10    SHARED DISPOSITIVE POWER   
                WITH                                                
                                          2,699,395 See Item 5  
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     2,699,395 See Item 5.
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES  

                                                                          [_]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     48.3%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON

     PN
--------------------------------------------------------------------------------



CUSIP No. 988792107                SCHEDULE 13D              Page 4 of 9 Pages
--------------------------------------------------------------------------------

1    NAME OF REPORTING PERSON

     T. MICHAEL LONG
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP              (a)    [X]
                                                                   (b)    [_]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    SOURCE OF FUNDS

     OO
--------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEMS 2(D) OR 2(E)                                                   
                                                                          [_]
--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     UNITED STATES
--------------------------------------------------------------------------------

              NUMBER OF                        
                                    7     SOLE VOTING POWER        
               SHARES       
                                          -0-                                 
            BENEFICIALLY        ------------------------------------------------
                                    8     SHARED VOTING POWER                  
              OWNED BY                                              
                                          2,699,395 See Item 5              
                EACH            ------------------------------------------------
                                    9     SOLE DISPOSITIVE POWER              
              REPORTING                                             
                                          -0-                              
               PERSON           ------------------------------------------------
                                    10    SHARED DISPOSITIVE POWER     
                WITH                                                
                                          2,699,395 See Item 5  
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     2,699,395 See Item 5.
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES  

                                                                          [_]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     48.3%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON

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



CUSIP No. 988792107                SCHEDULE 13D              Page 5 of 9 Pages
--------------------------------------------------------------------------------

1    NAME OF REPORTING PERSON

     LAWRENCE C. TUCKER
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP              (a)    [X]
                                                                   (b)    [_]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    SOURCE OF FUNDS

     OO
--------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEMS 2(D) OR 2(E)                                                   [_]

--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     UNITED STATES
--------------------------------------------------------------------------------

              NUMBER OF                        
                                    7     SOLE VOTING POWER        
               SHARES       
                                          1,960                          
            BENEFICIALLY        ------------------------------------------------
                                    8     SHARED VOTING POWER                  
              OWNED BY                                              
                                          2,699,395 See Item 5              
                EACH            ------------------------------------------------
                                    9     SOLE DISPOSITIVE POWER              
              REPORTING                                             
                                          1,960
               PERSON           ------------------------------------------------
                                    10    SHARED DISPOSITIVE POWER   
                WITH                                                
                                          2,699,395 See Item 5  
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     2,701,355 See Item 5.
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES  

                                                                          [_]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     48.3%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON

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



CUSIP No. 988792107                SCHEDULE 13D             Page 6 of 9 Pages
--------------------------------------------------------------------------------


            This Amendment No. 7 ("Amendment No. 7") to Schedule 13D is filed by
the undersigned to amend and supplement the Schedule 13D filed on November 20,
2000 (the "Original 13D"), as amended by Amendment No. 1 to Schedule 13D filed
on July 12, 2001 ("Amendment No. 1"), Amendment No. 2 to Schedule 13D filed on
August 9, 2001 ("Amendment No. 2"), Amendment No. 3 to Schedule 13D filed on
August 26, 2004 ("Amendment No. 3"), Amendment No. 4 to Schedule 13D filed on
December 3, 2004 ("Amendment No. 4"), Amendment No. 5 to Schedule 13D filed on
July 18, 2005 ("Amendment No. 5"), and Amendment No. 6 to Schedule 13D filed on
September 2, 2005 ("Amendment No. 6"), relating to the common stock (the "Common
Stock"), par value $.01 per share, issued by Trinsic, Inc., a Delaware
corporation (the "Company"). Unless otherwise indicated, all capitalized terms
shall have the same meaning as provided in the Original 13D as amended by
Amendment No.1, Amendment No. 2, Amendment No.3, Amendment No.4, Amendment No. 5
and Amendment No. 6.

Item 1.     Security and Issuer.

            No Change.

Item 2.     Identity and Background.

            No Change.

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

            No Change.

Item 4.     Purpose of Transaction.

            No Change.




CUSIP No. 988792107                SCHEDULE 13D             Page 7 of 9 Pages
--------------------------------------------------------------------------------


Item 5.     Interest in Securities of the Issuer.

            Item 5 is hereby amended and supplemented by the addition of the
following:

            On September 29, 2005 the Company informed the Fund that it was
unable that to enter into definitive agreements to acquire no less than 150,000
"UNE-P" subscriber lines (tested as of September 29, 2005). Pursuant to the
adjustment provisions of the Certificate of Designation of the Series H
Preferred Stock, the conversion price of the Series H Preferred Stock acquired
by the Fund in July 2005 was automatically adjusted to a predetermined price of
$0.20 and the shares of Series H Preferred Stock owned by the Fund became
convertible into 12,042,385 shares of Common Stock after giving effect to the
Company's one for ten reverse stock split (the "Stock Split") announced on
September 28, 2005.

            As of the date hereof, based on calculations made in accordance with
Rule 13d-3 promulgated under the Exchange Act and there being 5,590,560 shares
of Common Stock outstanding (as of September 2, 2005 according to the Schedule
14A filed by the Company with the Securities and Exchange Commission on such
date, and after giving effect to the Stock Split), not including for purposes
of this calculation the Common Stock issuable upon the conversion of the shares
of Series H Preferred Stock as such shares may not convertible within sixty days
of the date hereof, the number of shares of Common Stock the Fund, BBH, Long and
Tucker are deemed to own and the percent of the outstanding shares of Common
Stock after giving effect to the Stock Split are as follows:

                             Shares              Percentage
                          -----------            ----------
Fund                      2,699,395                 48.3%
BBH                       2,699,395                 48.3%
Long                      2,699,395                 48.3%
Tucker                    2,701,355                 48.3%



CUSIP No. 988792107                SCHEDULE 13D             Page 8 of 9 Pages
--------------------------------------------------------------------------------


            As of the date hereof, based on calculations made in accordance with
Rule 13d-3 promulgated under the Exchange Act and there being 5,590,560 shares
of Common Stock outstanding (as of September 2, 2005 according to the Schedule
14A filed by the Company with the Securities and Exchange Commission on such
date, and after giving effect to the Stock Split), including for purposes of
this calculation only the Common Stock issuable upon the conversion of the
shares of Series H Preferred Stock, the number of shares of Common Stock the
Fund, BBH, Long and Tucker would be deemed to own and the percent of the
outstanding shares of Common Stock after giving effect to the Stock Split are as
follows:

                            Shares                 Percentage
                        --------------             ----------
Fund                      14,741,780                 83.6%
BBH                       14,741,780                 83.6%
Long                      14,741,780                 83.6%
Tucker                    14,743,740                 83.6%


Item 6.           Contracts, Arrangements, Understandings or Relationships with
                  Respect to the Common Stock of the Issuer.

                  No Change.

Item 7.           Material To Be Filed as Exhibits.

                  No Change.



CUSIP No. 988792107                SCHEDULE 13D             Page 9 of 9 Pages
--------------------------------------------------------------------------------


                                    SIGNATURE

          After reasonable inquiry and to the best of its knowledge and belief,
each of the undersigned certifies that the information set forth in this
statement is true, complete and correct.

Dated:    October 3, 2005

                                         THE 1818 FUND III, L.P.

                                         By: Brown Brothers Harriman & Co.,
                                             General Partner


                                         By: /s/ Lawrence C. Tucker
                                             --------------------------------
                                             Name:  Lawrence C. Tucker
                                             Title: Partner



                                         BROWN BROTHERS HARRIMAN & CO.


                                         By: /s/ Lawrence C. Tucker
                                             --------------------------------
                                             Name:  Lawrence C. Tucker
                                             Title: Partner


                                         /s/ T. Michael Long
                                         ------------------------------------
                                                    T. Michael Long


                                         /s/ Lawrence C. Tucker
                                         ------------------------------------
                                                    Lawrence C. Tucker