| OS | iOS 8, upgradable to iOS 11.0.2iOS 8, upgradable to iOS 11.0.2 |
| Chipset | Apple A8 |
| CPU | Dual-core 1.4 GHz Typhoon (ARM v8-based) |
| GPU | PowerVR GX6450 (quad-core graphics) |
| 2G | Yes |
| 3G | Yes |
| 4G | Yes |
| Dimensions | 158.1 x 77.8 x 7.1 mm |
| Weight | 172 g |
| SIM | Nano-SIM |
| Colors | Space Gray, Silver, Gold |
| Technology | LED-backlit IPS LCD, capacitive touchscreen, 16M colors |
| Size | 5.5 inches, 83.4 cm2 (~67.8% screen-to-body ratio) |
| Resolution | 1080 x 1920 pixels, 16:9 ratio (~401 ppi density) |
| Multitouch | Yes |
| Built-in | 16/64/128 GB |
| Card | No |
| RAM | 1GB |
| Back | 8 MP, f/2.2, 29mm, phase detection autofocus, OIS, dual-LED (dual tone) flash |
| Front | 1.2 MP, f/2.2, 31mm, 720p@30fps, face detection, HDR, FaceTime over Wi-Fi or Cellular |
| Video | 1080p@60fps, 720p@240fps |
| Features | 1/3" sensor size, 1.5 µm pixel size, touch focus, geo-tagging, face/smile detection, HDR (photo/panorama) |
| Bluetooth | 4.0, A2DP, LE |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac, dual-band, hotspot |
| GPS | Yes, with A-GPS, GLONASS |
| Radio | No |
| USB | 2.0 |
| NFC | Yes (Apple Pay only) |
| Alert types | Vibration, proprietary ringtones |
| Loudspeaker | Yes |
| 3.5mm jack | Yes |
| Capacity | 2915 mAh |
| Standby | Up to 384 h (3G) |
| Talktime | Up to 24 h (3G) |
| Removable | No |
| Sensors | Fingerprint (front-mounted), accelerometer, gyro, proximity, compass, barometer |
| Browser | HTML5 (Safari) |
| Messaging | iMessage, SMS (threaded view), MMS, Email, Push Email |
| Torch | Yes |
| Games | Downloadable |
| Java | No |