Mobile data usage with turned off roaming
Hello Apple Community,
I am from Germany but have been in the USA for a little over 2 weeks. I have turned off roaming on my iPhone 11 since I flew here and have also completely disabled my mobile data.
However, my mobile data costs now already show €2.12 for this month. I also incurred mobile data charges last month, even though I actually had them turned off on my iPhone.
Since I'm staying in the U.S. for a while, I want to avoid further costs for mobile data, which I don't even use here!
I use internet exclusively with wifi.
Where do the costs for mobile data usage come from when I have completely turned off the use of mobile data and roaming in the settings on my iPhone for more than 2 weeks?
How can I avoid further costs?
I would like to add that I have been to the US several times before, but this is the first time the problem has occurred. Otherwise, with mobile data & roaming turned off, I never had a problem or extra charges.
Many thanks in advance!