The main objective of the study is to analyze the service quality of CDMA mobile service in Coimbatore city of Tamil Nadu, India. One twenty respondents were randomly selected and they were personally interviewed. For collection of primary data from respondents (customers) separate well structured interview schedule was prepared based on the objectives of the study and pretested. Statistical tools like Percentage Analysis, Garrett’s Ranking Technique, Factor analysis, Chi-square test, Gap analysis and paired t test were used to analyze the data. The results showed that majority of the respondents switched over from other mobile services to CDMA mobile service because of good schemes, call rate, low price of mobiles, CDMA technology and tariff plan.