If unpairing doesn’t work, the last possible solution is resetting the Apple Watch to its factory settings. It is important to mention that this will erase all media, data, and settings from the device. On your Apple Watch, go to Settings > General > Reset, and hit “Erase All Content and Settings.” Go through the caution message, and at the bottom, select “Erase All.” Following this, you should see the Apple logo, which stays on for a few minutes.
Once your watch is reset, you’ll be asked to bring your iPhone closer to initiate the pairing sequence. When the pairing screen appears on your iPhone, tap “Continue.” Alternatively, head to the Watch app on your iPhone, hit the “Pair New Watch” button, and then select “Set Up for Myself.” Next, hold your iPhone to scan the pattern on the watch’s screen. Since a setting or a file in the backup could hinder the connection process, we recommend choosing the “Set Up as New Apple Watch” and following the on-screen instructions.
This should fix the connection issue on your Apple Watch, connecting it successfully with your iPhone. However, if it doesn’t, we recommend scheduling an appointment at your nearest Apple Service Center.
Be sure to check out our guide on the 15 most frustrating Apple Watch Issues and how to fix them.