Abstract: A smart phone includes VoIP circuitry that enables the smart phone to make and receive voice and video calls and text messages over a data network using VoIP. The smart phone also includes GSM circuitry that enables the smart phone to make and receive voice and text messages through a GSM network. A unified user experience is created for sending and receiving phone calls, video calls, text messages, and conferencing over VoIP, as well as for sending and receiving phone calls, enabling conferencing, and text messages over the GSM phone network.