Electronic messages such as pages are exchanged between a user device and a message service using one of multiple wireless communication networks. The wireless communication networks may include mobile and/or fixed wireless networks. The user device registers with the message service through at least one of the wireless communications networks. The user device may register through multiple wireless communication devices when available. The user device sends messages through the wireless network through which registration has been established and may apply rules to choose when registration has occurred via multiple wireless networks.