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"No Internet Connection" in The Garmin Connect App for iOS
The Garmin Connect™ App can operate from wi-fi alone when available, however outside of wi-fi, it will require cellular data. If you see the following banner appear for "No internet connection" at the top of your iOS device's Garmin Connect App, you may need to enable cellular data for the app.
Enable Cellular Data
Select your iOS device's Settings.
In the list of apps, select Connect.
Toggle Cellular Data on.