Just a friendly reminder your devices are listening.
While anything with a mic can potentially be hacked, its known that cell phones are mandated to have surveillance capabilities. This can bypass the OS, as the cell modems have direct memory access, and its mandated that LE has a backdoor they can use to spy on people, even if the phone is off. A battery disconnect will kill the mic.
Just reminder to treat all microphones plugged into a power source as live, unless known otherwise.
1. make a fairday cage. Get a box that can fit your electronics. Get some radio reflective paint. Get a box. Paint the box inside and out. Connect your phone to cell tower, blue tooth and wifi, put the phone in the box, ensure the connections die.
PROTIP: STOCK microwave ovens do not work. It should work if you spray the inside of a microwave oven. untested though.http://www.all-spec.com/Catalog/Paints-Coatings/Coatings/Conductive-Coatings/841-340G-33018?gclid=CMG7neuQ7NECFYWCswodkfINrw
2. Step two - get a white noise generator. You can get these things at bed bath and beyond as well as target as well as the internet. They use these in doctors office to prevent people overhearing sensitive communications.
Put devices in painted box next to white noise generator.
Double pro-tip: remember security culture. If you use it like contraband, it is contraband. The entire point is to look non suspicious. If anyone asks about the items, you need plausible stories about what you are doing with them.
White noise generator is to help you sleep. They are sold as sleep aids. the RF paint is for your radio project.
Triple pro-tip: bug detectors should find people's cell phones and anything else that needs to go in the box for the conversation. Any electronics that has a wireless data interface of any kind needs to go in the box.