The purpose of this paper is to identify and examine the determinants of service qualityrnand sati~faction of customers ofCDMA Ix. While modified SERVPERF model was usedrnto measure the service quality aspects and customer satisfaction with CDMA Ix servicernof Ethiopian Telecommunication Corporation was measured by using a separate item.rnThe modified SER VP ERF instrument maintained seven dimensions namely tangibles,rnreliability, responsiveness, empathy, assurance, network quality, and convenience with arntotal of 2 7 statements placed on a 5-point Likert type scale (l being strongly disagree torn5 being strongly agree). Furthermore, a sample of 240 respondents ' subscribers ofrnCDMA Ix users in Addis Ababa city was drawn using stratified random samplingrnapproach, and 206 completely .filled questionnaires were used in performing finalrnanalysis. The overall scale reliability (alpha) of the modified SERVPERF model wasrnfound to be 0.930. Additionally, findings support that three out of seven dimensions ofrnmodified SERVPERF were contributing significantly to determine overall customerrnsatisfaction. Among theses network quality was found to be the most critical determinantrnof customer satisfactionfollowed by empathy and assurance. The main limitations of thisrnstudy include small sample size and the geographical coverage to Addis Ababa city. Bothrnthe overall service quality and associated customer satisfaction were found to bernreported below average, therefore it can be conclude that ETC has to do a lot onrnattributes associated with network quality, empathy and assurance, in order to bringrnhigher the level of satisfaction of its customers.