Had no problems anywhere in the UK in recent years on 4G and I've been all over the place. 4G has been incredibly reliable for me. Even on a £10/month SIM only

Had no problems anywhere in the UK in recent years on 4G and I've been all over the place. 4G has been incredibly reliable for me. Even on a £10/month SIM only thing, I was up a volcano in the middle of nowhere in Iceland and able to make calls.