Ring Doorbell mobile data

I have recently brought a 2nd gen doorbell. All working great on WiFi, but I can't access via the app on mobile data, I'm on EE and my wife is on O2 and it works fine for her. I can access via the internet browser. I rang EE and they said to contact Ring. So I contacted Ring and they said call EE. EE reset all my mobile data settings etc and it still won't work. Anyone got any ideas