I am in France with a Danish SIM card from Oister and a subscription with EU data. I have activated roaming and set the phone to select the network automatically. Unfortunately, I have no mobile data. All networks are shown as forbidden if I try to choose a network manually.
My provider says there is no problem and that I should have data. Which settings should I check to make it work?
Assuming the various APNs of those networks are correct, and that Oister is authorized to roam on them, and that you’re set to 4G and/or 5G, if applicable… Private DNS settings maybe?
You might also dial *#*#INFO#*#* and check Phone Information. Try dropping down to GSM Only for a few minutes to see if you can get a connection of some kind, then rise to 4G.
(Even if there’s officially no 2G left, there might still be some kind of connection.)