The Cellular version of Series 9, pairing the new S9 chip's on-device Siri with always-connected LTE — the familiar antenna-embedded back crystal repair from prior Cellular generations, now alongside faster on-watch processing.
| Chip | Apple S9 (dual-core, 64-bit) |
| Case sizes | 41mm / 45mm |
| Connectivity | Built-in GPS + LTE Cellular, Wi-Fi + Bluetooth |
| Cellular | eSIM |
| New | Double Tap gesture, on-device Siri |