The new system will turn a cellphone into a multi-band walkie-talkie, allowing it to function even in areas with no cell service. The system will feature a sturdy case designed to protect the phone, since most people using walkie-talkies are moving around outside. It will work on VHF, UHF and 800Mhz, and the Radio-Over-IP repeater feature will allow it to use the cell signal to extend the communication distance from 25 miles to anywhere in the world. The internal battery will...