https://www.vice.com/en_us/article/pkgbpn/how-the-fbi-wiretapped-the-world

For years criminal organizations around the world were buying a special phone called Anom. The pitch was that it was completely anonymous and secure, a way for criminals to do business without authorities watching over their shoulder. 

It turned out that the whole thing was an elaborate honeypot and that the FBI and law enforcement agencies around the world were listening in. They’d help develop the phones themselves.