Samsung Galaxy S2 Skyrocket I727 16GB Unlocked GSM 4G LTE Smartphone w/ 8MP Camera - White Android 4.1.2 (Jellybean) update available with 1.5 GHz dual-core processor and 4.5-inch Super AMOLED Plus multi-touch display GSM 850 / 900 / 1800 / 1900 3G HSDPA 850 / 1900 / 2100 LTE 700 / 1700 / 2100 8-MP camera with Full HD 1080p video capture; 16 GB internal memory; microSD memroy expansion; Wirelss-N Wi-Fi networking (with optional Mobile Hotspot capabilities) Up to 7 hours of talk time, up to 250 hours (10.4 days) of standby time; released in November, 2011 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.