In the past it was not uncommon to get a €100 bill if you used your phone on vacation like you do at home. But it has become cheap enough that you do not really

In the past it was not uncommon to get a €100 bill if you used your phone on vacation like you do at home. But it has become cheap enough that you do not really have to worry about it when you are on holiday for a week or two. I normally only update apps over wifi.