<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                              ---------------------

   
                                    FORM 10-Q/A
                                  Amendment No. 1
    

     [X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
                              EXCHANGE ACT OF 1934

                  For the quarterly period ended March 31, 1999

                                       OR

    [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
                              EXCHANGE ACT OF 1934

            For the transition period from             to 
                                           -----------    -----------

                        Commission file number 333-64717

                               US XCHANGE, L.L.C.
             (Exact name of registrant as specified in its charter)


          MICHIGAN                                     38-33505418
(State or Other Jurisdiction of             (I.R.S. Employer Identification No.)
Incorporation or Organization)

   20 MONROE AVENUE NW, SUITE 450, GRAND RAPIDS, MICHIGAN              49503
         (Address of Principal Executive Offices)                    (Zip Code)

       Registrant's telephone number, including area code: (616) 493-7000



     Indicate by check mark whether the registrant: (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes |X| No |_|

     At May 13, 1999, all of the membership interests of the registrant were
held by two affiliates of the registrant.



<PAGE>   2


                               US XCHANGE, L.L.C.

                          QUARTERLY REPORT ON FORM 10-Q

                                TABLE OF CONTENTS
<TABLE>
<CAPTION>

                                                                                                              Page No.


<S>                                                                                                                 <C>
PART I  FINANCIAL INFORMATION........................................................................................3


Item 1. Financial Statements.........................................................................................3

   Consolidated Balance Sheets.......................................................................................3
   Consolidated Statements Of Operations.............................................................................4
   Consolidated Statements Of Cash Flows.............................................................................5
   Notes To Consolidated Financial Statements........................................................................6

Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations........................9


Item 3. Quantitative and Qualitative Disclosures About Market Risk..................................................14


PART II  OTHER INFORMATION..........................................................................................15


Item 6. Exhibits and Reports on Form 8-K............................................................................15


SIGNATURES..........................................................................................................16


INDEX TO EXHIBITS...................................................................................................17
</TABLE>




                                      -2-
<PAGE>   3
                                     PART I

                              FINANCIAL INFORMATION

ITEM 1.  FINANCIAL STATEMENTS.
                               US XCHANGE, L.L.C.
                           CONSOLIDATED BALANCE SHEETS

   
<TABLE>
<CAPTION>
                                                                                     MARCH 31,           DECEMBER 31,
                                                                                       1999                 1998
                                                                                  ---------------       ---------------
                                                                                    (UNAUDITED)
ASSETS
<S>                                                                                <C>                   <C>
Current Assets
     Cash and equivalents..................................................         $10,463,257           40,018,552
     Restricted investments................................................          27,406,656           28,525,109
     Accounts Receivable, less allowance for doubtful accounts
        of $259,000 and $174,000...........................................           2,773,748            1,865,503
     Other current assets..................................................             944,382              700,411
                                                                                   ---------------------------------
                                                                                 
          TOTAL CURRENT ASSETS.............................................          41,588,043           71,109,575
                                                                                   ---------------------------------
NETWORKS AND EQUIPMENT
     Networks and networks in process (cost to complete of $19,053,000)....          96,648,069           85,821,872
                                                                                     
     Furniture and equipment...............................................          15,966,088           14,017,604
     Leasehold improvements................................................           5,666,057            3,937,223
                                                                                   ---------------------------------
                                                                                    118,280,214          103,776,699
     Less accumulated depreciation and amortization........................           5,474,308            3,432,193
                                                                                   ---------------------------------
NET NETWORKS AND EQUIPMENT.................................................         112,805,906          100,344,506
                                                                                   ---------------------------------
OTHER ASSETS
     Restricted investments................................................          42,782,486           56,206,738
     Debt issuance costs, net..............................................           6,967,734            6,793,770
     Miscellaneous.........................................................             509,179              261,328
                                                                                   ---------------------------------
     TOTAL OTHER ASSETS....................................................          50,259,399           63,261,836
                                                                                   =================================
     TOTAL ASSETS..........................................................        $204,653,348         $234,715,917
                                                                                   =================================
LIABILITIES AND MEMBERS' CAPITAL (DEFICIT)
CURRENT LIABILITIES
     Accounts payable......................................................          $8,533,613           11,264,241
     Accrued interest......................................................           7,521,257           15,521,634
     Accrued other liabilities.............................................           2,795,834            1,185,820
     Current maturities of long-term debt..................................             800,000              800,000
                                                                                   ---------------------------------
         TOTAL CURRENT LIABILITIES.........................................          19,650,704           28,771,695
     LONG-TERM DEBT, LESS CURRENT MATURITIES...............................
     15% Senior Notes......................................................         200,000,000          200,000,000
     Notes payable.........................................................           2,400,000            2,533,333
                                                                                   ---------------------------------
         TOTAL LIABILITIES.................................................         222,050,704          231,305,028
MEMBERS' CAPITAL (DEFICIT)
     Capital contributions.................................................          60,000,000           60,000,000
     Accumulated deficit...................................................         (77,397,356)         (56,589,111)
                                                                                   ---------------------------------
         TOTAL MEMBERS' CAPITAL (DEFICIT)..................................         (17,397,356)           3,410,889
                                                                                   =================================
                                                                                   $204,653,348         $234,715,917
                                                                                   ==================================
</TABLE>
    

     See accompanying notes to unaudited consolidated financial statements.

                                      -3-
<PAGE>   4


                                   SIGNATURES

   
     Pursuant to the requirements of the Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this Amendment No. 1 to the
report to be signed on its behalf by the undersigned thereunto duly authorized.
    

                                      US XCHANGE, L.L.C.


May 18, 1999                   By:/s/ Richard Postma
                                  ----------------------------------------------
                                  Richard Postma
                                  Co-Chairman and Chief Executive Officer


   
May 18, 1999                   By:/s/ Donald Offringa
                                  ----------------------------------------------
    
                                  Donald Offringa
                                  Vice President of Finance (Principal Financial
                                  Officer and Principal Accounting Officer)




                                       16