Re: Can my iPhone XR pair with my Apple Watch Series 8?
Seems an iPhone XR with iOS 16 or higher can pair with a Series 8 watch is if the watch has watchOS 9 or higher
About watchOS 9 Updates - Apple Support says watchOS 9.6.1 is the latest version.
Wondering too, whether or not this iPhone and this watch have been paired before.
If the iPhone is a new iPhone to the Watch, see: How to pair your Apple Watch with a new iPhone - Apple Support
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If the watch needs upgrading to Watch OS9 or higher in order to pair with the iPhone:
You may want to use the iPhone to update the watch :
Scroll to: ““Update your Apple Watch using your iPhone” in this article: Update your Apple Watch - Apple Support
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Else you may want to try the trouble-shooting tips in the article below:
What to do: If you can't pair an Apple Watch with your iPhone - Apple Support