watchOS 27 narrows Apple Watch compatibility to newer models

TL;DR Summary
Apple announced watchOS 27 at WWDC26, bringing new features like Siri AI and workout insights, but it drops support for older Apple Watches. The models able to run watchOS 27 are the Apple Watch SE (3rd generation), Series 10, Series 11, Ultra 2, and Ultra 3; it requires an iPhone 11 or later, or iPhone SE (2nd generation or later) running iOS 27, with some features limited on older devices.
- watchOS 27 drops support for several Apple Watch models, here’s the full compatibility list 9to5Mac
- Apple drops support for a long list of iPads and Apple Watches with latest OS updates The Verge
- watchOS 27 for Apple Watch unveiled with these features 9to5Mac
- watchOS 27 Gets A Siri Upgrade And Perimenopause Features Engadget
- Coaching, wellness features & AI make the biggest impact in watchOS 27 AppleInsider
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