[guardian-dev] signal without sim ?

Michael Rogers michael at briarproject.org
Thu Jan 9 12:22:01 EST 2014


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On 09/01/14 16:51, Hans-Christoph Steiner wrote:
> This is definitely on-topic for this list!  We'd love to help you
> dig deeper in this topic since its largely a big question mark.
> 
> We've had a bunch of questions about airplane mode.  To start with,
> is it actually turning the GSM/CDMA/LTE radios off?

Some phones are quite chatty with their radio logs - for example
'logcat -b radio *:V' on the Galaxy Nexus shows what appear to be
dumps of packets exchanged with the phone network when
enabling/disabling airplane mode, mobile data, etc. But I don't know
enough about GSM and friends to know what I'm looking at.

This doesn't of course prove that the hardware isn't doing secret
things, but it may provide some clues about what the software *thinks*
the hardware's doing, for someone better able to understand those
clues than me.

Cheers,
Michael

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