EXHIBIT 12 SOUTHWESTERN BELL CORPORATION COMPUTATION OF RATIOS OF EARNINGS TO FIXED CHARGES DOLLARS IN MILLIONS YEAR ENDED DECEMBER 31, 1993 1992 1991 1990 1989 Income Before Income Taxes, Extraordinary Loss and Cumulative Effect of Changes in Accounting Principles* $ 1,882.9 $ 1,701.2 $ 1,557.0 $1,541.4 $ 1,479.5 Add:Interest Expense 496.2 530.0 577.7 529.7 543.8 1/3 Rental Expense 41.0 45.1 37.5 43.4 42.5 Adjusted Earnings $ 2,420.1 $ 2,276.3 $ 2,172.2 $2,114.5 $ 2,065.8 Total Interest Charges $ 496.2 $ 530.0 $ 577.7 $ 529.7 $ 543.8 1/3 Rental Expense 41.0 45.1 37.5 43.4 42.5 Adjusted Fixed Charges $ 537.2 $ 575.1 $ 615.2 $ 573.1 $ 586.3 Ratio of Earnings to 4.51 3.96 3.53 3.69 3.52 Fixed Charges <FN> *Undistributed earnings on investments accounted for under the equity method have been excluded. NOTE:Prior year ratios have been restated to conform to current year methodology of computing undistributed earnings on investments accounted for under the equity method.