The objective of this paper is to propose a reliable and accurate positioning method, which provides location estimates for the mobile user in hybrid wireless network (IEEE802.11/WiFi, IEEE802.16/WiMAX and LTE technologies). The developed data fusion algorithm utilises measurements and features such as Time of Arrival (TOA) measurements and multiple input, multiple output (MIMO) antennas and wireless links between mobile users in order to enhance the mobile-centric positioning accuracy. Therefore, in this paper not only a new reliable concept of mobile user positioning is proposed, but also it is applied to case scenarios where various wireless networks are present. Results satisfy the FCC requirements for the mobile-centric positioning solution.