Reconnecting your Apple Watch to your iPhone
Deactivate/Unpairing Apple Watch before Pair Up Again
You must first unpair your Apple Watch from your old iPhone before you can pair it with a new iPhone. Here’s how:
Place your head on the charger of Apple Watch
Hold the side button until you see the Power Off slider.
Hold the Digital Crown and tap Reset when it displays on your watch.
Then From now, Your watch will also unpair completely After resetting.
How to Pair Apple Watch with new iPhone
After you have unpaired your Apple Watch, this is how to pair it with your new iPhone:
Switch your Apple Watch on and wear the it.
On your new iPhone, head to the Watch app, select “Add Watch” and go through the pairing process.
Enter the Apple ID and password that you used to set up the Apple Watch.pair apple watch with new iphone (ad)
Complete the pairing process as described on screen.
Once you pair your Apple Watch with your new iPhone, you can restore a backup to transfer over your settings and apps and data. In the world of wireless technology, devices like your earbuds should likely be as close to each other as possible when pairing and syncing for optimal connection.
Been having issues still, then perhaps the wise choice would be to reset your Apple Watch again and besides you can always contact with Apple Support.