How to connect my apple watch with my iphone

If your Apple Watch still can’t connect, un pair your devices, then pair them again:

On your Apple Watch, tap Settings > General > Reset > Erase All Content and Settings.
On your iPhone, open the Apple Watch app, tap the My Watch tab, then tap your watch at the top of the screen. …
Pair your Apple Watch and iPhone again.

Or

On your iPhone , go to Settings.
Tap Bluetooth.
Toggle the Bluetooth switch to turn it on or enable Bluetooth connectivity feature on your new iPhone.
Connect your iPhone to Wi-Fi or cellular network.
Turn on your Apple Watch. …
Hold your Apple Watch and iPhone 8 Plus close together.