Another news item today, as seen a long time ago in “Halting State” by @cstross. After an attack on a server used by the police in Mecklenburg-Vorpommern, a federal state in Germany, all special “patrol” mobile phones run via this server as well as the server itself have been shut down. Apparently, attackers were able to gain access to the server and the phones in a way that survives reboots.
https://www.heise.de/news/Polizei-Handys-seit-Cyberangriff-nicht-nutzbar-10456563.html