Samsung Galaxy S4 SGH-i337 4G Cell Phone, 16GB, Red, AT&T GSM 850 / 900 / 1800 / 1900, 3G Network: HSDPA 850 / 900 / 1900 / 2100, 4G Network: LTE 700 MHz Class 17 / 1700 / 2100 5" Super AMOLED Capacitive Multi-Touchscreen w/ Protective Corning Gorilla Glass 3 Android v4.2.2 (Jelly Bean), upgradable to v4.4.2 (KitKat), Quad-Core 1.9 GHz Krait 300 Processor, Chipset: Qualcomm APQ864T Snapdragon 6, Adreno 320 Graphics 13 Megapixel Camera (4128 x 3096 pixels) w/ Autofocus, LED Flash + Front-Facing 2 Megapixel Camera, 1080p@30fps, dual video call + Video 1080p@30fps, dual-video rec. Internal Memory: 16GB storage, 2GB RAM + microSD Slot Expandable up to 64GB For AT&T Wireless Only, AT&T SIM Card Required.