My friend switched to Plusnet 3 days ago from BT. I setup his router for port forwarding for his CCTV setup exactly same as with the BT router. He now has a very strange issue that he cannot view his CCTV remotely while on 4G with o2, I tested with my Three mobile and also a Vodafone one and this works absolutely fine. We then tried another mobile that was on o2 and the same issue occurred. This used to work flawlessly while with BT. Anybody else experienced this or any ideas?!?