Method and device for managing simultaneous connections of a mobile telecommunications device to at least a wireless local area network and a mobile telephone network via a single terminal of the mobile telecommunications device, the method including the steps of: (a) establishing a first wireless connection of the terminal with the wireless local area network, (b) establishing a second wireless connection of the terminal with the mobile telephone network, (c) responding to each network at predetermined times, such that the first and second wireless connections are maintained, and (d) preventing simultaneous transmittals of data from the terminal to both networks over the first and second wireless connections.