EXHIBIT 11.1 COMPUTATION OF EARNINGS PER SHARE CELLULAR TECHNICAL SERVICES COMPANY, INC. COMPUTATION OF EARNINGS PER SHARE (unaudited) THREE MONTHS ENDED SIX MONTHS ENDED JUNE 30, JUNE 30, ------------------------- ------------------------- 1997 1996 1997 1996 ---------- ---------- ---------- ---------- Primary earnings per share: Net income (loss) for calculation of primary earnings per share $(996) $(1,990) $ 3,418 $(4,491) ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- Weighted average number of shares outstanding 22,696,280 21,898,426 22,667,773 21,753,664 Dilutive effect of outstanding stock options - based upon the Treasury Stock Method using average market price(1) 535,995 ---------- ---------- ---------- ---------- Weighted average number of shares, as adjusted, for calculation of primary earnings per share 22,696,280 21,898,426 23,203,768 21,753,664 ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- Primary earnings (loss) per share (2) $ (.04) $ (.09) $ .15 $ (.21) ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- - ---------- (1) Common Stock equivalent shares have not been considered in the calculations for the three and six month periods ended June 30, 1996 and the three month period ended June 30, 1997 because the effect would be antidilutive. (2) Fully diluted earnings per share computations are not included since they would not materially change results presented on the primary earnings per share basis. Page 16