Samsung Galaxy Mega 6.3 I527 16GB Unlocked GSM 4G LTE Smartphone w/ 8MP Camera - Black This cell phone is compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM need cards e.g. H20, Straight Talk, and select prepaid carriers need to contact the service provider to check fully compatibility of the phone This phone doesn't work with CDMA carrier like Verizon and Sprint. In order to get data with the phone it may be necessary to change the APN setting with service provider. Android v4.2.2 JellyBean (upgradable), Dual-Core 1.7 GHz Krait 300 Processor, Chipset: Qualcomm Snapdragon 4, Adreno 305 Graphics 8 Megapixel Camera 3264 x 2448 pixels w/ Autofocus & LED Flash + Front-Facing 1.9 Megapixel Camera. Battery, Standby 3G up to 460hrs;,4G up to 410hrs. Battery, Talk Time up to 18hrs. Music Play Time up to 87hrs. Video Play Time up to 10hrs. Internet Use Time 3G up to 10hrs,4G up to 10hrs.Wi-Fi up to 11 hrs Internal Memory 16GB, 1.5GB RAM + microSD Slot Expandable up to 64GB / 6.3-inch SC-LCD Capacitive Multi-Touchscreen w/ TouchWiz UI