Phones can be used to eavesdrop even if turned off, as revealed in court proceedings against the Genovese family in the mid-2000's. Called "roving bugs" I think

Phones can be used to eavesdrop even if turned off, as revealed in court proceedings against the Genovese family in the mid-2000's. Called "roving bugs" I think. https://arstechnica.com/tech-policy/2006/12/8343/ https://arstechnica.com/tech-policy/2006/12/8343/