Samsung Galaxy Mega 6.3 I527 16GB Unlocked GSM 4G LTE Smartphone w/ 8MP Camera - Black (Certified Refurbished) Unlocked cell phones are compatible with GSM carriers like ATT 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. 6.3-inch SC-LCD Capacitive Multi-Touchscreen w/ TouchWiz UI Android v4.2.2 JellyBean (upgradable), Dual-Core 1.7 GHz Krait 300 Processor, Chipset: Qualcomm Snapdragon 4, Adreno 305 Graphics