<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> 6-MOS 9-MOS 12-MOS
<FISCAL-YEAR-END> DEC-31-1999 DEC-31-1999 DEC-31-1999
<PERIOD-START> JAN-01-1999 JAN-01-1999 JAN-01-1999
<PERIOD-END> JUN-30-1999 SEP-30-1999 DEC-31-1999
<CASH> 617 318 876
<SECURITIES> 0 0 0
<RECEIVABLES> 6,800 6,428 6,868
<ALLOWANCES> 977 1,128 1,122
<INVENTORY> 0 0 0
<CURRENT-ASSETS> 10,188 9,784 10,324
<PP&E> 28,222 30,449 33,738
<DEPRECIATION> (3,412) (4,304) (5,110)
<TOTAL-ASSETS> 87,199 87,568 91,072
<CURRENT-LIABILITIES> 16,964 15,682 17,226
<BONDS> 13,877 13,561 13,128
798 798 798
0 0 0
<COMMON> 28 28 28
<OTHER-SE> 48,357 49,413 51,210
<TOTAL-LIABILITY-AND-EQUITY> 87,199 87,568 91,072
<SALES> 0 0 0
<TOTAL-REVENUES> 17,590 26,586 35,908
<CGS> 7,496 11,089 14,739
<TOTAL-COSTS> 14,298 21,095 28,020
<OTHER-EXPENSES> (22) (53) (242)
<LOSS-PROVISION> 458 674 951
<INTEREST-EXPENSE> 520 748 966
<INCOME-PRETAX> 2,794 4,796 7,164
<INCOME-TAX> 1,201 1,994 2,965
<INCOME-CONTINUING> 1,613 2,710 4,013
<DISCONTINUED> 0 0 0
<EXTRAORDINARY> 0 0 0
<CHANGES> 0 0 0
<NET-INCOME> 1,577 2,656 3,941
<EPS-BASIC> 0.56 0.94 1.40
<EPS-DILUTED> 0.54 0.91 1.35
</TABLE>