Samsung and MetroPCS today announced the Tint R420, a basic clamshell phone with user-changeable front and back covers. Other features include ChatLINK push-to-talk, Bluetooth, camera, color outer display, and GPS navigation. With tri-band CDMA, the Tint supports the AWS CDMA networks in MetroPCS’ newest covered cities. The Tint is available now in select locations for $129.