JIAKE Rugged GSM Cell Phone - Shockproof Dustproof Dual SIM Unlocked Mini Cell Phone A8 (Army Green) Mini size: 100mm*40mm*15mm Super shockprof Dual SIM, dual standby 2.0" HD Display; Back camera: 1.0MP Network frequency: GSM 850/900/1800/1900MHz 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.