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).
4.7-inch Retina HD display. 12-mexapixel iSight camera now includes Live Photos ? allowing you to capture a still photo, together with what happens before and after your picture. 5-megapixel FaceTime HD camera.