The first thing you will notice about the T4 series is the revolutionary appearance. The screen is not only large but functional. By putting the most desired features at your fingertips the technical design of the phone is unparalleled. The T4 series is not only pleasurable and practical to use but also offers support for gigabit networks, plus USB Bluetooth support for easy Bluetooth earphone use. Enhanced sound quality is delivered by the Optima HD Voice system which meets TIA 920 certification standards.