<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>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-START> JAN-01-1999
<PERIOD-END> JUN-30-1999
<CASH> 616
<SECURITIES> 0
<RECEIVABLES> 6,800
<ALLOWANCES> 977
<INVENTORY> 0
<CURRENT-ASSETS> 10,188
<PP&E> 28,222
<DEPRECIATION> (3,412)
<TOTAL-ASSETS> 87,199
<CURRENT-LIABILITIES> 16,964
<BONDS> 13,877
798
0
<COMMON> 28
<OTHER-SE> 48,357
<TOTAL-LIABILITY-AND-EQUITY> 87,199
<SALES> 0
<TOTAL-REVENUES> 18,187
<CGS> 8,093
<TOTAL-COSTS> 14,895
<OTHER-EXPENSES> (22)
<LOSS-PROVISION> 458
<INTEREST-EXPENSE> 520
<INCOME-PRETAX> 2,794
<INCOME-TAX> 1,201
<INCOME-CONTINUING> 1,613
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 1,577
<EPS-BASIC> 0.56
<EPS-DILUTED> 0.54
</TABLE>