The "off != off" is a good point, but that's still redefining Off a bit. The "capability in practice" you link to is slightly questionable because we have A Du

The "off != off" is a good point, but that's still redefining Off a bit. The "capability in practice" you link to is slightly questionable because we have A Dumb Bad Guy claiming they turned their phone off. We don't know the entire story. Regardless of everything here: you are right that phones are out of our control at this point. If you don't want to be found, don't keep anything capable of emitting RF around you (including, but not limited to: phones, laptops, tablets, anything with RFID/NFC embedded, toll collecting car passes, tires with embedded RF transmitters for authentication or tire pressure checks, bluetooth headsets, bluetooth speakers, wifi/bluetooth digital scales, bluetooth hearing aids, ...).