Methods and systems of communication using a mobile device include communicating with other mobile devices over an initial communication channel, detecting a first motion of the mobile device moving from a first position to a second position, establishing a second communication channel with the other mobile devices in response to the detected first motion, and communicating with the other mobile devices over the second communication channel. In an example, the initial communication may be a half-duplex communication channel, and the second communication channel may be a full-duplex communication channel. In another example, the initial communication may be a full-duplex communication channel, and the second communication channel may be a half-duplex communication channel.