I bought a KPN SIM card (the 1GB one) for my uncle who was visiting, and we were promised he would be able to use that to access internet in Europe. While he was in NL it was fine, but now he is in Belgium and it doesn't work anymore. Data Roaming is on. We tried to change the network provider (already tried all of them) and also to changed the APN to portalmmm.nl. And rebooted the phone after each change. But nothing worked so far. Can you help us?
Beste antwoord door Marina_
Open the Settings app on your iPhone.
Go to Mobile network> Mobile data options.
Tap Turn on 4G and choose the option Off.
I hope that this solves the problem.