There are two versions of the F3; the 850/1900 MHz variant works with any GSM carrier in the US (AT&T/T-Mobile/etc). I bought one for $40. The calls sound clea

There are two versions of the F3; the 850/1900 MHz variant works with any GSM carrier in the US (AT&T/T-Mobile/etc). I bought one for $40. The calls sound clear, the battery lasts for 5+ days, and you can run over it in a car without breaking it.