Mobile communications with quality of service

An electronic communications system comprising:

• a mobile network to provide communications between a plurality of mobile communications devices and a wide-area internet protocol (IP) network, wherein mobile directory numbers are associated with the plurality of mobile communications devices;
• a wireless local-area network (WLAN) to provide communications between the plurality of mobile communications devices and a wide-area IP network;
• a Voice over Internet Protocol (VoIP) service coupled to the mobile network and the WLAN via the wide-area IP network, wherein the plurality of mobile communications devices are associated with VoIP telephone numbers;
• a public switched telephone network (PSTN) coupled to the plurality of mobile communications devices and coupled to the VoIP service;
• and
• a quality of service (QoS) server coupled to the plurality of mobile communications devices via the wide-area IP network for determining quality of a data channel to a mobile communications device via the WLAN;
• a communications routing system coupled to (i) the mobile network, (ii) the WLAN via the wide area IP network, and (iii) the QoS server, the communications routing system configured to:
• obtain, from the QoS server, a quality of the data channel to the mobile communications device via the WLAN;
• and
• when the quality of the data channel exceeds a threshold quality, route a voice call over the data channel.