GSM Unlocked Phones are ONLY compatible with GSM carriers like AT&T and T-Mobile as well as other GSM networks around the world. They WILL NOT WORK with CDMA carriers like Sprint and Verizon (Search for "Fully Unlocked iPhones" for CDMA compatible iPhones).
12-megapixel primary camera on the rear and a 7-megapixel front shooter for selfies.
7 Megapixel FaceTime Camera with 1080p HD Video Recording, Retina Flash, f/2. 2 aperture.
5. 5-inch Retina HD LED-backlit Display with IPS Technology, 1920 x 1080 pixel resolution (~401ppi pixel density)