Cheap prepaid Internet for short stay in Germany? [merged]

[siskiou]

Originally Posted by inquisitor

So if you run out of coverage with an O2 SIM that's really bad luck.

I was very surprised to not get a connection at my friend's house, who lives very close to Koeln.
There were many not covered areas along the train route from Duesseldorf toward the coast (Norddeich), but it *is* a very thinly populated area along the way.

Frankfurt should be no problem at all!