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Mobile operators nowadays have plenty of data services, since the introduction of GPRS and this number is increasing towards future 3G LTE mobile networks. There are IP-based services which were migrated from wired to mobile networks, such as HTTP, FTP and E-mail. But, also mobile specific services were created such as WAP and MMS. On the other side, behavior of mobile services is influenced from the environment, the terrain, interference, from protocols on different OSI layers, from user behavior, etc. Therefore, mobile operators need to examine their network and be assured that services are performing well. In this paper we describe an applicative solution for Service Quality Testing System (SQTS), which provides efficient way for testing of all data services, including bearer as well as IP-based services in mobile networks from the user point of view, through a defined set of Key Performance Indicators. We define all SQTS functionalities as well as all needed networks nodes for its functioning. The proposed system is robust and scalable regarding definition of new services that will appear in future.