Is Apple Watch is compatible with iPhone 6?
Is Apple Watch is compatible with iPhone 6
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Which most likely means the used Apple Watch market.
The limitations with used market, is that the previous own properly cleaned the Apple Watch before sale
What to do before you sell, give away, or trade in your Apple Watch, or buy one from someone else
https://support.apple.com/en-us/HT208855
There is also the risk that the previous owner upgraded the Apple Watch to watchOS 6 or 7, which would also make it not work with the iPhone 6.
It would be better to start thinking about upgrading your iPhone first to a 6s, SE, 7, 8, X, Xs, XR, 11 or 12
