Apple Watch Series 5
Hello!
I’m thinking about buying the Series 5 Apple Watch for a friend of mine and I wanted to know if it will be compatible with their iPhone 6/6s or would they need a newer version of the iPhone?
Apple Watch
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iPhone 6s is the current minimum.
From the bottom of this Apple Watch page
https://www.apple.com/apple-watch-series-5
Apple Watch Series 5 and Apple Watch Series 3 require an iPhone 6s or later with iOS 13 or later.