Does this only work over 2.4Ghz? It is the frequency that affects water / human tissue. If it doesn't work over 5ghz, does turning off 2.4Ghz close this door?installing multiple 5Ghz access points to cover a house only prevents it from being done over your network. It doesn't prevent getting scanned by all of your neighbors' routers/access points in surrounding houses. Cyber operators have been carrying their phones in metal fabric bags/cases for over a decade to prevent the devices from sending/receiving signal or being tracked while in the case. Disabling sensors (dev options) and turning off location on Android devices would prevent it from your own device, but AFAIK, it's impossible on iPhone. Turning off an iPhone just turns it into an airtag for all other Apple devices.