” is turned off no matter what.”
Source?
But, consider...if big brother, in all their incarnations, have this power, why would they ever willingly relinquish it? For my best interests? Ha, I don't think so.
It's said the only way to stop the pings is to stop the signal, either by having a dead phone or shielding it, such as wrapping it in aluminum foil and placing in a closed jar.
Most phones no longer have a removable battery.