My Apple Watch is not pairing.
Apple Watch not working
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What series watch? What model iPhone? What iOS? Without knowing anything else, perhaps this article will help:
If you can't pair an Apple Watch with your iPhone - Apple Support
If you still have problems, your best option may be to make an appointment at the Genius Bar in an Apple Store near you and let them look at it. If that is not possible use the online Apple Support option. They have diagnostics that should be able to determine if it is a hardware or software problem. Either way:
Genius Bar Reservation and Apple Support Options - Apple