A system and a method are disclosed for controlling voice communications through a mobile computing device. In one embodiment, a mobile computing device enabled for telephony communications establishes a telephone call to transmit voice signals and mutes the established telephone call. When ready to transmit voice signals, a control switch configured on the mobile computing device is depressed and held for a duration in which to transmit those voice signals in the established telephone call. Once transmission of the voice signals is completed, the control switch is released to re-mute the established telephone call.