A wireless communication method and system for performing dual mode paging over a wireless communication network having both a second-generation/third-generation (2G/3G) radio access network (RAN) and an evolved-universal mobile telecommunication system (UMTS) terrestrial radio access network (E-UTRAN). When a wireless transmit/receive unit (WTRU) registers or originates traffic with an evolved network, no additional signaling is required Otherwise, the WTRU is paged via both of the 2G/3G RAN and the E-UTRAN, depending on the response from the WTRU, data is forwarded to the WTRU via the 2G/3G RAN or the E-UTRAN.