[guardian-dev] signal without sim ?

Hans-Christoph Steiner hans at guardianproject.info
Thu Jan 9 11:17:21 EST 2014

Airplane mode is implemented in software, so there is no guarantee that it is
actually turning off any radios.  This is the same case as the power buttons
on phones: they don't physically cut power to the device, so many devices
don't really turn off at all when you "turn them off".

NSA whistleblower mentioned in one interview that the interviewer's phone
could be controlled by the NSA, even if he "turned it off".  If you are
concerned, remove the battery.


On 01/09/2014 10:57 AM, shmick at riseup.net wrote:
> how does the following make sense
> android phone *without* sim & aeroplane mode *on*
> network: unknown
> signal strength: -51dBm
> mobile network type: UNKNOWN:0
> service state: radio off
> android phone *without* sim & aeroplane mode *off*
> network: unknown
> signal strength: -81dBm (fluctuating strength; stationary phone)
> mobile network type: EDGE:2
> service state: out of service
> i thought in aeroplane mode all radios were off and you could, depending
> on the phone, enable wifi, bluetooth selectively, etc
> but where is the signal strength coming from - i thought a phone could
> not associate/ping a cell tower without a sim *unless* making an
> emergency call
> also why does a phone without a sim last immensely longer (in my case)
> than compared with aeroplane mode with a sim ?
> can/do phones ping/associate cell towers/base stations in aeroplane mode ?
> can/do phones ping/associate cell towers/base stations without a sim ?
> (probably, if your phone is ownd anything is likely)
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