Live view not working on IOS data

Hi, Live view has not been working on my iphone data for a few weeks. I can access video and previous live view.
I recently installed 2 more cameras that would allow me to live view on data. Then after a few days these were not available on live view also.
Live view works on WIFI.
I have rebooted, uninstalled the ring app, reset network settings on the iphone still not working. Any ideas?