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. Android OS, v6.0 (Marshmallow), Dual SIM (Nano-SIM, dual stand-by), 6.0 inches IPS-NEO LCD capacitive touchscreen, 16M colors, HiSilicon Kirin 950,32 GB, 3 GB RAM, microSD, up to 128 GB (uses SIM 2 slot), 16 MP Camera, Fingerprint, accelerometer, gyro, proximity, compass.