Comment by aja12
3 days ago
Baseband SoC running their own OS independent from Android/iOS and staying asleep (while still listening for incoming signals) is very much no longer in conspiracy theory territory and more an established fact now. I don't have the source at hand but it's in one of the standards. And the purpose is very clear: LEA like Interpol must be able to locate any IMEI at any point if in tower range, regardless of the power state of the "main" OS
Even in airplane mode?
I dare you to do the following:
Charge phone to full 100%. Turn it off.
Put it into a faraday cage, e.g. a steel box, for 7 days.
Take it out again and wonder why the battery is empty.
(The faraday cage has the effect of making the modem have to switch bands constantly, which costs more electricity than sleep mode in LTE)