The inreach has no data capabilities as you describe. It uses satellite for SOS and short message/email communications only. You can link it via Bluetooth to your phone and use the garmin Earthmate app for more advanced gps and easier messaging but that is pretty much it. Phone works the same as usual when linked. Great tool for its intended purpose though.
The Garmin Earthmate app is included with the purchase of an inreach. You can use the app for navigation and the inreach for communication. If you pair the two with bluetooth, you can use your phone normally