Caterpillar B100 Unlocked GSM Military Grade + IP67 Certified Smartphone - Black MIL SPEC 810G: Extreme temperatures, Thermal shock, Vibration, Drop tested up to 6 feet (1.8M) on concrete, Salt Mist IP67 CERTIFIED: Dust, water proof DISPLAY: 2.2" QVGA DURABLE CONSTRUCTION: Internal frame and angled edges reduce drop impact FULL - FEATURED: Noice Cancelling Microphone, High Quality Speaker, 3MP Camera, GPS, WIFI, Bluetooth 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.