A method of operating a wireless access point, said wireless access point being in the form of a Wireless Local Area Network, WLAN, routing and modem device and being suitable for connecting to a public wide area network, the wireless access point being operated so as to manage access of at least one mobile device to a voice service located in a cellular network, in which the voice service being accessible via a base station of the cellular network and also via a gateway server, accessible to the wireless access point, said gateway server being located at a boundary between the cellular network and the public wide area network, the wireless access point having: a wireless network interface for communication with the at least one mobile device via a wireless local area network link; and a wide area network interface for communication with the public wide area network, and the at least one mobile device having: a cellular network interface and a wireless network interface, wherein the at least one mobile device is configured to connect to the voice service via a first path from the mobile device to the voice service via the base station and cellular network, and a second path from the mobile device via the wireless access point, public wide area network, the gateway server and the cellular network; the method, being performed by the wireless access point, comprising the steps of: monitoring whether the at least one mobile device is currently connected to the voice service via the second path; and characterised by the steps of: processing presence information, said presence information being received from a gateway presence monitor located in the public wide area network and relating to the accessibility of the gateway server via the public wide area network; and in dependence upon said monitoring and processing of presence information, if the at least one mobile device is connected to the voice service via the second path and the gateway server is not accessible via the public wide area network, the wireless access point instructing the at least one mobile device to connect to the voice service via the first path. a wireless network interface for communication with the at least one mobile device via a wireless local area network link; and a wide area network interface for communication with the public wide area network, and the at least one mobile device having: a cellular network interface and a wireless network interface, wherein the at least one mobile device is configured to connect to the voice service via a first path from the mobile device to the voice service via the base station and cellular network, and a second path from the mobile device via the wireless access point, public wide area network, the gateway server and the cellular network; the method, being performed by the wireless access point, comprising the steps of: monitoring whether the at least one mobile device is currently connected to the voice service via the second path; and characterised by the steps of: processing presence information, said presence information being received from a gateway presence monitor located in the public wide area network and relating to the accessibility of the gateway server via the public wide area network; and in dependence upon said monitoring and processing of presence information, if the at least one mobile device is connected to the voice service via the second path and the gateway server is not accessible via the public wide area network, the wireless access point instructing the at least one mobile device to connect to the voice service via the first path. a cellular network interface and a wireless network interface, wherein the at least one mobile device is configured to connect to the voice service via a first path from the mobile device to the voice service via the base station and cellular network, and a second path from the mobile device via the wireless access point, public wide area network, the gateway server and the cellular network; the method, being performed by the wireless access point, comprising the steps of: monitoring whether the at least one mobile device is currently connected to the voice service via the second path; and characterised by the steps of: processing presence information, said presence information being received from a gateway presence monitor located in the public wide area network and relating to the accessibility of the gateway server via the public wide area network; and in dependence upon said monitoring and processing of presence information, if the at least one mobile device is connected to the voice service via the second path and the gateway server is not accessible via the public wide area network, the wireless access point instructing the at least one mobile device to connect to the voice service via the first path. processing presence information, said presence information being received from a gateway presence monitor located in the public wide area network and relating to the accessibility of the gateway server via the public wide area network; and in dependence upon said monitoring and processing of presence information, if the at least one mobile device is connected to the voice service via the second path and the gateway server is not accessible via the public wide area network, the wireless access point instructing the at least one mobile device to connect to the voice service via the first path.