EXHIBIT 12 PACIFIC BELL COMPUTATION OF RATIOS OF EARNINGS TO FIXED CHARGES Dollars in Millions NINE MONTHS ENDED SEPTEMBER 30, YEAR ENDED DECEMBER 31, ------------------ --------------------------------------------------- 1997 1996 1996 1995 1994 1993 1992 --------- --------- --------------------------------------------------- Income (Loss) From Continuing Operations Before Income Taxes, Extraordinary Loss and Cumulative Effect of Accounting Changes $ (74) $ 1,491 $ 1,945 $ 1,538 $ 1,692 $ (39) $ 1,738 Add: Interest Expense 336 277 363 410 439 429 460 1/3 Rental Expense 52 37 46 28 40 37 35 --------- --------- -------- --------- -------- -------- --------- Adjusted Earnings $ 314 $ 1,805 $ 2,354 $ 1,976 $ 2,171 $ 427 $ 2,233 ========= ========= ======== ========= ======== ======== ========= Total Interest Charges $ 373 $ 306 $ 411 $ 410 $ 439 $ 429 $ 460 1/3 Rental Expense 52 37 46 28 40 37 35 --------- --------- -------- --------- -------- -------- --------- Adjusted Fixed Charges $ 425 $ 343 $ 457 $ 438 $ 479 $ 466 $ 495 ========= ========= ========= ========= ======== ======== ========= Ratio of Earnings to Fixed Charges 0.74 5.26 5.15 4.51 4.53 0.92 4.51