I have a serie 3 watch and can’t get it to connect to an iphone

If its on iOS16 make sure it is on ios16.2

Many people have found series 3 impossible to pair but keep trying

First check you have no other sports watches like Fitbit that are paired to your iPhone 

Then force restart the watch. i.e. press and hold both the side button and Digital Crown for at least 10 seconds, then release both buttons when you see the Apple logo.

Then Force Restart the paired iphone 

Force restart iPhone – Apple Support (UK)

Then in the iphone, Settings, General, Transfer or reset iphone, Reset, Reset network settings.

Make sure you have no VPN or VPN based adblocker

Then reset the router to factory settings which usually involves a paperclip on a little hole.

Try again.

Then I recommend reviewing the steps in the articles below

How to pair an Apple Watch with your iPhone

 Click: How to pair your Apple Watch with a new iPhone - Apple Support or

Can’t pair an Apple Watch with your iPhone

Click:  If you can't pair an Apple Watch with your iPhone - Apple Support  or

Apple Watch not paired with your iPhone

Click:  If your Apple Watch isn't connected or paired with your iPhone - Apple Support

Try pairing it as a New Watch not from backup.

Series 3,2,1 are increasingly more difficult to pair to iOS 16. The memory is only 8GB.