Hi @JohnMac1. In this case, the issue is not with your Ring device, as the Live View works fine when your phone is connected to wifi. Live View not connecting when your phone is using cellular data indicates that there may not be enough data, or that the signal isn’t strong enough.

Streaming video on cellular data can use it up quicker than other activities, like browsing the web. Even plans with unlimited data may place restrictions on the data used after a certain amount. I’d suggest contacting your service provider to see if anything has changed with your plan that could prevent you from accessing Live View.