The purpose of this study was to build customer loyalty. The method used is survey with descriptive and explanatory analysis. The unit of analysis is the post-paid customers with the sample size of 80 people. Based on the analysis, found that the service process conducted by the positive response from postpaid customer. Service process effect of customer loyalty of Postpaid, so customers loyalty will be build, if  service process from registration until after sales service do the better.

kata kunci :
service process, customer loyalty