What Apple Watch to buy?

Apple Watch series 4 or earlier running watchOS 5 or earlier will work with an iPhone 6.

Its important its running watchOS 5 or earlier because watchOS 6 requires iOS 13 and watchOS 7 requires iOS 14 which the iPhone 6 cannot run.

If you buy a brand new Apple Watch Series 3 today from Apple it will have at least watchOS 6 which will not work with an iPhone 6.

• Not sure if you get the Apple watch. Apple Watch Series 3 requires an iPhone 6s or later with iOS 14 or later.