Apple Watch
I’m not able to connect my watch to my phone.
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Best reply
Which Apple Watch and iPhone do you have, and which software versions are installed?
You can only pair an Apple Watch having watchOS 9 installed, with an iPhone, running iOS 16, for example.
Older Apple Watch models and software may also need an iPhone with a previous iOS version.
Have a look at this article:
Set up and pair your Apple Watch with iPhone - Apple Support