GSM Unlocked Samsung i847 Rugby Smart 4G 5MP Android 2.3.5 Military Standard MIL-STD 81F Touchscreen 4G LTE-enabled waterproof (1m for 30 min.), dustproof and shock resistant smartphone with Android 2.3 Gingerbread OS, 3.7-inch Super AMOLED Display with reinforced shock resistant glass, and a single-core 1.4 GHz processor Wireless-N Wi-Fi networking (with optional Wi-Fi Mobile Hotspot service) 5-MP camera; 720p camcorder; front-facing video chat camera; Bluetooth stereo music; 4 GB memory (expandable to 36GB with an optional 32GB microSD card); corporate and personal e-mail 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.