I would love to have something like this. When I call an Uber/Lyft as I am walking out of my apartment, it always takes forever for the WiFi to disconnect, long after it has lost internet connection. So I constantly get the "Unable to Connect to Network" error, and I have to turn off WiFi and restart the app to actually call a ride.
If anyone knows of a solution to this problem on a Galaxy S8 I would love to hear it.