Samsung Focus Flash I677 8GB Unlocked GSM Phone with Windows 7.5 OS, 5MP Camera, GPS, Wi-Fi, Bluetooth and FM Radio  - Black Affordable, 4G-enabled Windows Phone 7 smartphone with large 3.7-inch Super AMOLED Plus touchscreen Runs Windows Phone 7.5 (Mango) OS; 1.4 GHz processor; 8 GB memory 5-MP camera with HD 720p video; 1.3-MP front cam for video chat; Bluetooth stereo music; GPS navigation Up to 6.5 hours of talk time, up to 240 hours (10 days) of standby time; released in November, 2011 What's in the Box: handset, rechargeable battery, charger, stereo headset, quick start guide 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.