The iPhone 6s 128GB features a 4.7-inch 3D Touch Retina display It is powered by the Apple A9 64-bit dual-core processor and 2GB of RAM The phone features a 12 MP primary camera and a 5 MP front-facing camera It has 128 GB of internal storage that is not expandable The iPhone 6s 128GB supports Wi-Fi, 4G, 3G, GPS and USB 2.0 connectivity The device runs the iOS 9 operating system It is backed by a 1,715 mAh battery