Data roaming charges to end in EU within two years
bbc.co.uk
bbc.co.uk
Canada did a similar thing a couple years ago. The CRTC imposed a law where an individual could only incur a maximum of $50 in data overage charges locally, and $100 when roaming.
I was ecstatic when this was announced. And then one month I went over on data by $50. And then my data was cut off until I bought a "pack".
So yes, your phone bill will be unsurprising at the end of the month, but now your carrier will expect you to purchase a bucket of "roaming data" in the form of an add-on or package to your regular phone plan so that you can post your selfies with the Eiffel Tower in real time.
I would say that cutting of the data would be "expected behavior" as far as I am concerned.