EXHIBIT 11.1 COMPUTATION OF EARNINGS PER SHARE CELLULAR TECHNICAL SERVICES COMPANY, INC. COMPUTATION OF EARNINGS PER SHARE (in 000's, except per share amounts) (unaudited) Three Months Ended March 31, ---------------------- 1997 1996 ------ ------ Primary earnings per share: Net income (loss) for calculation of primary earnings per share $ 4,414 $ (2,501) -------- -------- -------- -------- Weighted average number of shares outstanding 22,639 21,609 Dilutive effect of outstanding stock options - based upon the Treasury Stock Method using average market price1 1,072 -------- -------- Weighted average number of shares, as adjusted, for calculation of primary earnings per share 23,711 21,609 -------- -------- -------- -------- Primary earnings (loss) per share2 $ .19 $ (.12) -------- -------- -------- -------- - ----------------------------------- 1 Common Stock equivalent shares have not been considered in the calculations for the three month period ended March 31, 1996 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 12