Samsung Galaxy S4 M919 16GB Unlocked GSM 4G LTE Quad-Core Smartphone - White Frost Android Smart Phone for T-mobile, GoSmart Mobile, Solavei or Simple Mobile OS : Android KitKat 4.4.2 Camera resolution (Front) 2.0MP Camera resolution (Rear) 13MP Internal Memory : 2 GB RAM, 16 GB ROM (Portion of memory occupied by existing content)