The issue is reported to occur on all models of the Apple Watch and iPhone. Some users faced the issue after an update of the OS of the Apple Watch or iPhone while in others it started to occur after the replacement of the screen of the watch. Before moving on with the troubleshooting process to pair your Apple Watch with the iPhone, make sure the OS of your Apple Watch and iOS version of your phone is compatible. Moreover, try to manually pair your watch with the phone. Also, make sure there is no wireless/ Bluetooth interference near the watch or iPhone.
Solution 1: Restart the Watch and iPhone
The issue could be a temporary glitch in the communication/application modules of the devices. This can be cleared by restarting the Apple Watch and iPhone.
Solution 2: Try to Pair Devices without AppStore Login
The Apple AppStore login is known to create issues in the pairing of the devices. In this case, pairing the devices without AppStore may bypass any potential bugs and solve the connectivity problem.
Solution 3: Remove the Watch From the iCloud Devices
There is a bug that does not let a user pair the iPhone with an Apple Watch if the watch is already in the iCloud devices of the user. The same could be the reason for the current paring issue. In this context, removing the watch from the iCloud devices and then pairing the devices may solve the problem.
Solution 4: Disable iMessages
iMessages is a good Apple service but has a known history of creating pairing issues for Apple Watch. The same could be the reason for the current pairing issue. In this scenario, disabling iMessages and then pairing the devices again may solve the problem.
Solution 5: Reset the Network Settings of Your iPhone to Defaults
You may also encounter the error under discussion if the network settings of your phone are misconfigured/corrupt. Here, resetting the network settings to the default values may solve the problem. This step will reset cellular settings, Wi-Fi settings, VPN and APN settings
Solution 6: Forget the Bluetooth Devices and Restart the Bluetooth
The pairing issue could be a result of a temporary glitch of the software/communication modules of Bluetooth technology. In this context, forgetting all the Bluetooth devices in the settings of your phone and re-enabling the Bluetooth of your iPhone may solve the problem.
Solution 7: Remove the Beta Profile from iPhone
Apple releases the public beta to the beta testers to identify bugs in the iOS before launching a stable release of the iOS. You may encounter the error at hand if you are a beta tester of the iOS (most probably a bug is creating the issue). In this context, removing the beta profile of iOS may solve the problem.
Solution 8: Update the iOS
Apple updates the iOS to improve performance by patching known bugs and add new features. You may fail to pair your Apple Watch with the iPhone is the iOS of your phone is an outdated one. In this scenario, updating the iOS of your phone to the latest build may solve the problem because there will be no compatibility issues. Before proceeding, make sure your watch will be compatible with the updated OS of your iPhone. If not, we can try enabling Beta version (you can skip this part if you do not want to avail Beta services). Open the page of the Apple Beta program in a web browser and log in using your Apple ID. Proceed with caution because you are becoming a beta tester of the OS and the OS may be unstable/buggy for some users.
Solution 9: Update the WatchOS of Your Apple Watch
The OS of your Apple Watch is updated continuously to improve performance. You may encounter the error under discussion if the OS of your watch is outdated and is hence having issues when connecting to a latest iOS system in your iPhone. In this case, updating the OS of your watch to the latest build may solve the problem. Before proceeding, make sure your phone will support the updated OS of the Watch by looking at compatible devices.
Solution 10: Reset the OS of Your Apple Watch to Factory Defaults
This error might also occur if the OS of your Watch is corrupt or is missing modules that cannot be repaired. In this case, resetting the OS of your Apple Watch to the factory defaults may solve the problem. You may lose the un-synced data.
Solution 11: Reset iPhone to Factory Defaults
If nothing has helped you so far, then most probably, the OS of your iPhone is corrupt and is the root cause of the issue. In this scenario, resetting the iPhone to the factory defaults may solve the problem. If you are still encountering the issue, try to downgrade the iOS of your phone and OS of your watch (you may have to send your watch to Apple to downgrade its OS). Then check if the issue is resolved. If even then the Apple Watch is not pairing, then most probably the unit itself is faulty (especially if it cannot be paired with any other phone) and you should ask for a replacement of the watch from the vendor (if under warranty).
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