Having written about my iPhone 6S Plus connecting to 4G problems.
So the issue I have is I have been at home on the Wi-Fi, I leave the house and then wherever I am I check the phone as find that it says.
Could not activate mobile data network Turn on mobile data or use Wi-Fi to access data.
The only solution was to go into airplane mode and then turn that off. At which point all works fine. Even if you turn off mobile data and turn it back on again, that doesn’t work. It’s airplane mode or nothing!
I said that I was going to upgrade my iPhone to the latest iOS, 13.5.1 which I did and went fine.
Since then has it worked?
Well I have been out a couple of times and I think it’s being fine, but watch this space!