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You seem to be using an iPhone?
If so then it's almost certainly this issue due to the stupid way that Apple do things:
iPhone abroad issue
This problem hits many iPhone users who try to roam abroad.
You may need to try that setting several times before it works.
It may help to toggle airplane mode on and then off again and then quicly try to "catch" the local network so that you can make the configuration change.
Hope this helps.
Did that help at all?