Samsung i9506 16GB Black E330 S/K Galaxy S4 LTE-A Quad-core 2.3G Unlocked Smartphone Phone Samsung i9506 E330 S/K Galaxy S4 LTE-A Quad-core 2.3G Unlocked Smartphone Phone CPU & GPU: Snapdragon 800, Quad-core 2.3 GHz Krait 400, Adreno330 Memory: RAM 2GB , ROM 32GB Screen: 5.0 inches 1080 x 1920 pixels, 13 MP/ Auto Focus , LED flash Other: WCDMA /GSM , Android OS, v4.2.2 (Jelly Bean), battery 2600 mAh 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.