Motorola Defy Mini XT320 Unlocked GSM Phone with Android 2.3 OS, Touchscreen, Wi-Fi, GPS and Bluetooth - Black Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20, Straight Talk, and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin.