Sony Xperia X F5122 64GB Black, 5.0", Dual Sim, GSM Unlocked International Model, No Warranty Screen: 5.0 inches, IPS LCD capacitive touchscreen, 16M colors, Sim: Dual SIM (Nano-SIM, dual stand-by), Memory: 64 GB, 3 GB RAM, Card slot: microSD, up to 256 GB (uses SIM 2 slot) OS:Android 6.0.1 (Marshmallow), upgradable to 7.1.1 (Nougat), Chipset: Qualcomm MSM8956 Snapdragon 650, CPU: Hexa-core (4x1.4 GHz Cortex-A53 & 2x1.8 GHz Cortex-A72), Camera: 23 MP, f/2.0, 24mm, phase detection autofocus, LED flash, Secondary: 13 MP, f/2.0, 22mm, 1/3" sensor size, 1080p. Unlocked cell phones are compatible with GSM carrier such as AT&T and T-Mobile, but are not compatible with CDMA carriers such as Verizon and Sprint. Please check if your GSM cellular carrier supports the bands for this model before purchasing, LTE may not be available in all regions: 2G bands: GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2, 3G bands: HSDPA 800 / 850 / 900 / 1700(AWS) / 1900 / 2100, 4G bands: LTE band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 12(700), 17(700), 19(800), 20(800), 26(850), 28(700), 38(2600), 39(1900), 40(2300), 41(2500).