I have been having the same issue. Network unstable and drop the call unless I am on wifi. That is unacceptable to me as I use the app to remain mobile and not tethered to a location with wifi. I called Ringcentral and they were as much help as a kick in the teeth. The guy wanted to have the sales rep call me back. Go figure, I had to explain it is a tech issue and specifically request tech support. After over an hour on hold waiting I decided to uninstall the app, clear the cache and reboot my phone to clear any memory of the settings. Then I reinstalled the app and now it works fine. Gotta tell you I was about to call Ooma office as I NEED the mobile app for my business.
By the way, when reinstalling the app, turn your wifi OFF. I think it is a setting in the app that it looks for wifi for whatever reason. My thinking is that if the app is installed without having the ability to see wifi it won't activate the setting. I don't know for sure the why bit it seemed to work for me at least for now.
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