48 month contract with Unlimited 4G Data. O2 Priority, Charge to mobile, Recommend a Friend and Earn Rewards, 5G-ready, O2 Wi-Fi Hotspots, No speed caps, Wi-Fi Calling, eSIM Compatible. The Apple Watch Ultra 3 pushes endurance and precision further with a lightweight 49mm titanium case, upgraded OLED LTPO3 display with slimmer bezels, and dual-frequency GPS for elite tracking. Now featuring 5G connectivity, two-way satellite SOS, and up to 72-hour battery life in Low Power Mode, it’s built for extreme sports, diving (WR100), and remote adventures. Apple Intelligence powers new health tools including hypertension alerts and sleep scoring.