[wurzeltrick]

This is not correct, eventhough sometimes falsly claimed even by police officers. You are obliged to posess an ID card once you turn 16 years old (§1 PersAuswG). But you don't have to carry it with you, eventhough it might complicate things e.g. should you be cought comitting a small crime. You need to have it on you, or another valid ID, when crossing the border though.

[Semaphor]

Uh, you agreed with me.