Samsung Galaxy S5 Active G870a 16GB Unlocked GSM Extremely Durable Smartphone w/ 16MP Camera - Ruby Red Unlocked cell phones are compatible with GSM carriers like AT&T 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. 2G: GSM 850 / 900 / 1800 / 1900, 3G: HSDPA 850 / 1900 / 2100l, 4G: LTE 700 / 850 / 1700 / 1800 / 1900 / 2100 / 2600 5.1" Super AMOLED Capacitive Multi-Touchscreen w/ Protective Corning Gorilla Glass 3 Android v4.4.2 (KitKat), Quad-Core 2.5 GHz Krait 400 Processor, Chipset: Qualcomm Snapdragon 81, Adreno 330 Graphics 16 Megapixel Camera (3456 x 4608 pixels) w/ Autofocus, LED Flash + Front-Facing 2 Megapixel Camera Internal Memory: 16GB (11.2GB user available), 2GB RAM + microSD Slot Expandable up to 128GB