HTC Amaze T-Mobile GSM Unlocked 4G 16GB Android Smartphone - Black Weight - 6.1 oz (173 g) Dimensions - 5.12" x 2.58" x 0.46" Talk: 6 hours max Standby: 264 hours max. Resolution: 540 x 960 pixels 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.