Can I pair my Apple Watch Series 3 with iPhone 16?

Are you moving the watch to a new phone? If yes and didn't unpair it from the previous phone, read the section in this link which explains what to do if you don't have the previous phone with you anymore --> If you can't pair your Apple Watch with a new iPhone - Apple Support

BaldEagle69 wrote:

Hi do you know how? I have tried several times, every time it says Unable to connect to watch.

Take a look at this Support Article:

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

Yes.

(260498)

Yes. The minimum it requires to pair is an iPhone 6s or later.