That actually isn’t a way to prove anything, unfortunately.
A powered off or “powered off” phone wouldn’t need to transmit anything. It would be just waking one of the receivers periodically (or even the NFC could be hit by some radio energy as a trigger) to listen for the “secret” activation code. Listening for radio energy doesn’t generate any.
If the phone was “powered off” - tracing power draw between battery/phone would probably show something, but likely, the phone’s power draw while off is always constant if this were the case and it isn’t a new state the phone goes into.
Even if the phone was being used as an offline bug, the user would still not know because it can record audio/whatever and store it internally without ever transmitting. It’d likely be rigged up to just transmit the next time the user “turns it on” - so they’d be unaware, as the transmission would look like normal traffic.
The only case where it would be traceable from a radio perspective is if it were being used as an online bug, which means it would already have to have been put in the online bug state, which means someone has a reason to monitor you.
I mean shoot, if one really wants to go full tinfoil hat, recording audio to temporary storage at voice quality could go on for days with a phone “powered off” - periodically dumped to somewhere in flash. Hours of conversation could be fit in megabytes. The phone could just always be recording while turned off for every user, and when turned back on, that audio file is sent through the ML processor to convert to text, and then compress the text, further reducing the size. That data could be transmitted during normal usage as voice or compressed data, or just stored in the phone as compressed data for years.
Every phone could be doing this right now, and could have been doing this for a decade, although on-device text transcription is a relatively new feature.
Then, let us go next level: phone recycling/exchange processes also harvest IMEI+that compressed data before being shipped off for resale in the event it was never transmitted. Finally, we know why the NSA has the Utah data center.
I keep asking them to send me copies of recordings of old phone calls, but they never humor me.
DISCLAIMER: This is all non-serious but based on what is technically possible right now.
That actually isn’t a way to prove anything, unfortunately.
A powered off or “powered off” phone wouldn’t need to transmit anything. It would be just waking one of the receivers periodically (or even the NFC could be hit by some radio energy as a trigger) to listen for the “secret” activation code. Listening for radio energy doesn’t generate any.
If the phone was “powered off” - tracing power draw between battery/phone would probably show something, but likely, the phone’s power draw while off is always constant if this were the case and it isn’t a new state the phone goes into.
Even if the phone was being used as an offline bug, the user would still not know because it can record audio/whatever and store it internally without ever transmitting. It’d likely be rigged up to just transmit the next time the user “turns it on” - so they’d be unaware, as the transmission would look like normal traffic.
The only case where it would be traceable from a radio perspective is if it were being used as an online bug, which means it would already have to have been put in the online bug state, which means someone has a reason to monitor you.
I mean shoot, if one really wants to go full tinfoil hat, recording audio to temporary storage at voice quality could go on for days with a phone “powered off” - periodically dumped to somewhere in flash. Hours of conversation could be fit in megabytes. The phone could just always be recording while turned off for every user, and when turned back on, that audio file is sent through the ML processor to convert to text, and then compress the text, further reducing the size. That data could be transmitted during normal usage as voice or compressed data, or just stored in the phone as compressed data for years.
Every phone could be doing this right now, and could have been doing this for a decade, although on-device text transcription is a relatively new feature.
Then, let us go next level: phone recycling/exchange processes also harvest IMEI+that compressed data before being shipped off for resale in the event it was never transmitted. Finally, we know why the NSA has the Utah data center.
I keep asking them to send me copies of recordings of old phone calls, but they never humor me.
DISCLAIMER: This is all non-serious but based on what is technically possible right now.