Malware found preinstalled in classic push-button phones sold in Russia
Presume any phone you own has malware in it, and adjust your behavior accordingly. This means putting the phone in a Faraday sleeve when not using it, so it can't communicate with a C2, putting black nail varnish on the camera, keeping the phone in another room when having a sensitive conversation, etcFor doing the crimes, use a desktop PC with a TailsOS flash drive and communicate with XMPP with OTR preferably with Intel Management Engine neutered and removed. Do Not use a smartphone or dumbphone for criminal dealings.