Refurbished Tech Buying Guides UK » Apple Watch Ultra 3

Which Apple Watches support watchOS 27? See the full compatibility list, learn which older Series, SE and Ultra models miss the update, understand Apple Intelligence requirements and compare the best refurbished Apple Watches to buy in 2026.

Apple Watch Ultra 4 brings longer battery life, the S11 chip, new health sensing, Readiness and Siri AI — but Ultra 3 already offers the same rugged 49mm titanium design, bright display, 5G, satellite connectivity and serious sports features. Here’s which offers better value in 2026.