4 ms·

They could turn off cellular and turn on bluetooth.

• Phlarp 7y ago
  The baseband radio still communicates with the tower in airplane mode.
  • fwn 7y ago
    That's interesting. Does anyone have a further source or description of that behaviour?
    • zaarn 7y ago
      It's required for emergency calls to quickly enable routing of said emergency call. They work even with no SIM or IMEI in the phone in some countries, though most western countries are starting to require SIM cards due to abuse (SWATting).
      • rladd 7y ago
        Any Links / docs discussing that? I didn’t find anything about this in a bit of searching.