Apple A11 Bionic chip with M11 motion coprocessorDelivers outstanding overall performance for opening and running applications, flipping through menus, running home screens and more. iOS 11A powerful operating system that gets the job done securely and efficiently. Compatible with GSM carriers, including AT&T and T-MobileAlso compatible with GSM SIM Kits, including Cricket Wireless, Tracfone, Net10, H2O, AT&T Prepaid and Simple Mobile. 4G LTE speedProvides fast Web connection for downloading apps, streaming content and staying connected with social media. 5.5" Retina touch screen with IPS technologyExtra-large screen is matched with a slim body to comfortably fit in your hand. Offers 16:9 cinema-like screen ratio that's perfect for viewing of videos, photos and games. Dual 12.0MP rear-facing cameraRecord your favorite memories with good resolutions, with enough detail for print. Also includes a front-facing 7.0MP camera for self-portraits and video. 64GB internal memoryExtensive storage space for your contacts, music, photos, apps and more.