There have been some question about the supported bands and availability
of SIM cards in the matrix chat, so let's add at least that kind of
basic information.

The B96 is closed behind Oranienburg due to construction work between
Nassenheide und Teschendorf.

https://oranienburg.de/index.php?object=tx,2967.5&ModID=7&FID=2967.4046.1