Sony Xperia U ST25A-BP Unlocked Phone with Android 2.3 OS and 3.5-Inch Touchscreen--U.S. Warranty (Black/White) Networks: UMTS HSPA 850 (Band V), 1900 (Band II), 2100 (Band I); GSM GPRS/EDGE 850, 900, 1800, 1900 Google Android 2.3 (Gingerbread); 1 GHz STE U8500 Dual Core; Internal storage: 4 GB/RAM 512 MB Display: 3.5-Inch Capacitive touch screen, scratch-resistant, anti-reflection coating on mineral glass Camera: 5 megapixel with HD 720p video recording Black end cap can be replaced with the extra pink end cap included in the box. 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.