How to connect my Apple Watch to my iPhone 13 Pro Max?

"To set up and use (a new) Apple Watch, you need an iPhone 6s or later with iOS 15 or later.

..Learn how to Identify your iPhone model and how to update your iPhone to the latest version of iOS."

• Set up your Apple Watch - Apple Support

//support.apple.com/en-us/HT204505

[An edit to this tread, may have also removed 'helpful' details.]

However please do not post other personal or system details

those may compromise your security or that of your devices.

These other items mentioned in above article may be useful.

What model of watch is it?.