While the best unlocked phones almost certainly support GSM carriers like AT&T and T-Mobile, it’s best to look for devices that work with all the major U.S. providers, including Verizon.

This device combines a Palm OS 5 PDA with a quad-band GSM world phone and a VGA camera, in a sleek new form factor. Additional key features include a QWERTY mini-keyboard, SDIO expansion slot ...

Audiovox's first GSM PDA phone. This compact device is powered by a 400 MHz XScale processor. Features are typical for a Windows Mobile 2003 PDA phone, including a large touchscreen, speakerphone ...

168g (5G Sub-6); 171g ( 5G Sub-6 and mmWave), 8.2mm thickness ...