https://www.bleepingcomputer.com/news/security/hundreds-arrested-after-encrypted-messaging-network-takeover/

European law enforcement agencies arrested hundreds of suspects in several countries including France, Netherlands, the UK, Norway, and Sweden after infiltrating the EncroChat encrypted mobile communication network used by organized crime groups.

EncroChat phones used by international criminal networks around the world to exchange encrypted data and millions of messages came with dual operating systems (Android OS and the EncroChat OS).