CATERPILLAR CAT B15 IP67 ULTRA RUGGED BLACK FACTORY UNLOCKED SINGLE SIM CELL PHONE(2G 850/900/1800/1900 & 3G 900/2100) GSM/GPRS/EDGE: 850/900/1800/1900 MHz 3G 850/1900 Main Camera 5 MP, Front VGA 4GB internal memory, 512 MB RAM Micro SD up to 32 GB Processor: Media Tek, MT6577 DUAL CORE 1GHz 4" WVGA (480x800) Capacitive Display, Gorilla Glass, Wet Finger Tracking 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.