watchOS 27 Supports Only Five Apple Watch Models

TL;DR
Apple confirms watchOS 27 will run on just five Apple Watch models—SE 3, Series 11, Series 10, Ultra 3, and Ultra 2—while requiring an iPhone 11 or newer (or the second-gen iPhone SE or newer) running iOS 27, leaving many older watches without official support.
- watchOS 27 supported by just five Apple Watch models AppleInsider
- Apple drops support for a long list of Apple Watches with latest OS updates The Verge
- WatchOS 27 Fixes Siri at Last, but You May Need to Buy a New Apple Watch to Get It CNET
- Apple confirms watchOS 27 will run on Apple Watch Series 9 9to5Mac
- Apple just made about a million Apple Watches obsolete Macworld
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