48 month contract with 1GB 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. Built to push boundaries, Galaxy Watch Ultra withstands up to 55°C heat, 9,000m altitude, 10 ATM water pressure and runs smoothly through it all with a new, powerful 3nm processor. Trek further with battery that lasts up to 100 hours in Power saving mode.