Apple Watch can only connect to the LTE network in Canada. Your watch can’t independently connect to cellular networks when you’re outside the country.
To synchronize messages between your phone and watch, you must have enough free storage space in your iCloud account. If there isn’t enough space or if iCloud is not activated, the watch can still send and receive messages, but they will not be synched with your iPhone.
Before updating your devices, plug the Apple Watch into its charger and place it close to your Wi-Fi-connected iPhone. The Apple Watch must be charged to 50% or higher for the installation to begin.
Good to know
If your Apple Watch won’t turn off or the problem persists, you can force restart. Hold down the side button and Digital Crown at the same time for at least ten seconds until the Apple logo appears. Learn more.