Not in Germany, but i’d check whether “unlimited data” is really unlimited. My provider (in 🇳🇱) translates unlimited into 25 GB per day, which is enough on most days but not always

That happened to me once in Sweden, when I ran all the updates my then Windows laptop wanted after not using it for a few months 😅 But generally, I cannot think of any situation in which I would need 25 GB in one day