The purpose of this study is to determine customer satisfaction assessment at a selected telecommunication organization in Mongolia. The indicator to evaluate the customer’s perceptions of customer satisfaction is the SERVQUAL questionnaire. Previous researchers defined that service quality positive effects on attracting new customers, earn profit by increasing customers and loyalty of customer. Therefore, this study focused on to determine relationship of service quality factors that can affect customer satisfaction directly, satisfaction of customer and customer loyalty. Survey will be conducted to collect from 320 consumers of Mongolia in the city of Ulaanbaatar and SPSS 23 statistical software and Microsoft office EXCEL is used to analyses or conclude. The importance of the study is to provide suggestions and help to produce a strategic solution for Univision customer service managers.