Peterzahlt.de in German means “Peter Pays” and that he does. With Peterzahlt you get free phone to phone calls, though I’m not sure how many people can benefit from the fact that you can only make calls from a German phone to another German phone. Does it even work with German mobile phone? Probably not…

Overall?
I’d say this is a pretty useless service. Who needs German to German landline calls. Besides, these numbers are already free in Germany…