<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>
<RESTATED>
<MULTIPLIER> 1,000,000
<S> <C> <C> <C>
<PERIOD-TYPE> 12-MOS 12-MOS 3-MOS
<FISCAL-YEAR-END> DEC-31-1997 DEC-31-1998 DEC-31-1999
<PERIOD-START> JAN-01-1997 JAN-01-1999 JAN-01-1999
<PERIOD-END> DEC-31-1997 DEC-31-1998 MAR-31-1999
<CASH> 175 1,727 801
<SECURITIES> 54 0 0
<RECEIVABLES> 1,546 6,229 6,748
<ALLOWANCES> 223 920 955
<INVENTORY> 0 0 0
<CURRENT-ASSETS> 1,981 10,769 10,386
<PP&E> 8,015 26,843 26,750
<DEPRECIATION> (1,006) (2,275) (2,982)
<TOTAL-ASSETS> 24,400 87,092 86,553
<CURRENT-LIABILITIES> 2,187 16,180 18,173
<BONDS> 7,811 16,448 13,928
0 798 798
0 0 0
<COMMON> 15 28 28
<OTHER-SE> 14,072 45,213 46,552
<TOTAL-LIABILITY-AND-EQUITY> 24,400 87,092 86,553
<SALES> 0 0 0
<TOTAL-REVENUES> 7,643 17,646 8,817
<CGS> 3,741 8,011 3,832
<TOTAL-COSTS> 6,661 18,588 7,307
<OTHER-EXPENSES> (46) (44) 26
<LOSS-PROVISION> 132 395 228
<INTEREST-EXPENSE> 450 692 272
<INCOME-PRETAX> 578 (1,590) 1,212
<INCOME-TAX> 393 877 547
<INCOME-CONTINUING> 185 (2,560) 730
<DISCONTINUED> 0 0 0
<EXTRAORDINARY> (3) (129) 0
<CHANGES> 0 (36) 0
<NET-INCOME> 143 (2,767) 712
<EPS-BASIC> 0.10 (1.43) 0.25
<EPS-DILUTED> 0.09 (1.43) 0.24
</TABLE>