The first Apple Watch with built-in LTE cellular and an eSIM, letting it make calls and stay connected without a paired iPhone nearby — the added cellular antenna assembly behind the display makes screen and back-case repairs more involved than the GPS-only model.
| Chip | Apple S3 (dual-core) |
| Case sizes | 38mm / 42mm |
| Connectivity | Built-in GPS + LTE Cellular, Wi-Fi + Bluetooth |
| Cellular | eSIM, red Digital Crown marking |
| Sensor | Barometric altimeter (new) |