Can only access live view on wifi, not cellular data

Hi. I see many aged posts on issues with live streaming but looking for advice on a current one.I can no longer access live view when not on WiFi. It simply won’t work on cellular data.It did a year ago when I last used it.Same phone and setting (ie cellular data switched on)replaced all the kit so all brand new and firmware up to date.This used to work fine.Has Ring changed something to disable our ability to access live feeds on cellular data?Thanks in advance.