ConnectionIssues.com
I own and know how to operate a Iphone XS Max 512GB, old first Pebble watch, a Kronoz ZeTime, and a UWear UW80, that I just purchased.
This is an educational page to help people connect the smartwatch with their iphone smartphone.
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You Must turn off or delete all iPhone exiting health and fitness apps and Bluetooth connections and syncs
because the existing apps/connections/syncs will interfere with your new watches syncs.
Then
Reboot Iphone
Start Smartwatch app or Uwear App
Reboot Watch And It Should Start Syncing Data to get notifications and vibrate on the UWear watch UW80
The app must be running on the iphone before you turn the watch on and off again.
Last but not least, turn your smartwatch off and on again.
You need to do a test call to your phone from some other device, phone, Google voice, landline, to check to make sure your smartwatch is getting the
notifications and vibrating so you will
be notified when someone calls or text you.
I noticed that pressing the sync and weather buttons the smartwatch connect to the phone.
Also, pressing the connect and disconnect buttons makes it process notifications also.
If this fails the first time, try it again. Change what you did the first time.
Click on the buttons on the phone app to get it to sync.
On my UWear, you have to go the settings menu and click yes to accept the saved settings everytime
you close the app, or restart the phone, to get the notifications to start coming to the watch.
Then
Last but not least, turn the smartwatch off and on again.
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This educational information works for Garmin Smartwatch , UWear Smartwatch , etc.