Besides using your phone for a HotSpot, you can install a Winegard Connect 2. You can use it as a HotSpot with AT&T, Verizon, T-Mobile and a couple other services that offer data only plans.
https://winegard.com/products/cellul.../connect-2-4g2
This can work better than your phone as a HotSpot because it has a much better antenna system (and also mounted on the roof) and can pick up weaker cell signals than your phone. You then connect to it via Wifi with your phone, tablet, laptop, etc. and it provides good coverage inside and around the outside of your coach with it's own private WiFi connection.
It can also be used to connect to the campground WiFi and provide better converage if / when you want to use it (such as when there is no cellular coverage in the area).
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