<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS OF WORLDCOM, INC. AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000,000
<S> <C> <C> <C>
<PERIOD-TYPE> 3-MOS 6-MOS 9-MOS
<FISCAL-YEAR-END> DEC-31-2000 DEC-31-2000 DEC-31-2000
<PERIOD-START> JAN-01-2000 JAN-01-2000 JAN-01-2000
<PERIOD-END> MAR-31-2000 JUN-30-2000 SEP-30-2000
<CASH> 601 664 916
<SECURITIES> 0 0 0
<RECEIVABLES> 7,368 8,294 8,512
<ALLOWANCES> 1,242 1,285 1,867
<INVENTORY> 0 0 0
<CURRENT-ASSETS> 11,110 12,069 12,084
<PP&E> 36,654 38,916 42,011
<DEPRECIATION> (5,745) (6,104) (6,707)
<TOTAL-ASSETS> 94,512 97,373 99,893
<CURRENT-LIABILITIES> 17,654 14,048 15,686
<BONDS> 13,514 18,705 18,700
798 798 798
0 0 0
<COMMON> 29 29 29
<OTHER-SE> 53,023 54,173 55,248
<TOTAL-LIABILITY-AND-EQUITY> 94,512 97,373 99,893
<SALES> 0 0 0
<TOTAL-REVENUES> 9,619 19,436 29,483
<CGS> 3,733 7,509 11,376
<TOTAL-COSTS> 7,179 14,583 22,756
<OTHER-EXPENSES> (111) (220) (327)
<LOSS-PROVISION> 269 548 1,515
<INTEREST-EXPENSE> 218 454 699
<INCOME-PRETAX> 2,333 4,619 6,355
<INCOME-TAX> 953 1,883 2,580
<INCOME-CONTINUING> 1,301 2,592 3,559
<DISCONTINUED> 0 0 0
<EXTRAORDINARY> 0 0 0
<CHANGES> 0 0 0
<NET-INCOME> 1,284 2,559 3,510
<EPS-BASIC> 0.45 0.90 1.23
<EPS-DILUTED> 0.44 0.88 1.20
</TABLE>