[guardian-dev] signal without sim ?

[shmick at riseup.net]

Hans-Christoph Steiner:
> 
> 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".

can the lay person test this with off-the-shelf products ?
can you recommend decent irc channels and/or mailing lists dedicated to
mobile networks ?

thanks for answering albeit off-topic to list

> 
> 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.
> 
> .hc
> 
> 
> 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)
>> _______________________________________________
>> Guardian-dev mailing list
>>
>> Post: Guardian-dev at lists.mayfirst.org
>> List info: https://lists.mayfirst.org/mailman/listinfo/guardian-dev
>>
>> To Unsubscribe
>>         Send email to:  Guardian-dev-unsubscribe at lists.mayfirst.org
>>         Or visit: https://lists.mayfirst.org/mailman/options/guardian-dev/hans%40guardianproject.info
>>
>> You are subscribed as: hans at guardianproject.info
>>
>