The mobile communication industry has experienced huge growth in recent years, which amplified the competition among telecommunication companies. This inspired the search for new means of GSM network optimization that would bring better signal coverage and thus competitive advantage. One of the possibilities is active tracking of inroamer location in order to find where they disappear to a rival network. Data collected in this way can then be analyzed to detect weak points of network or traffic anomalies. This paper presents our implementation of active tracking of inroamer location within a live GSM network and the subsequent analysis and visualization of collected data, together with future plans for our platform called SS7Tracker. Keywords GSM, mobile networks, active tracking, inroamer, SS7