I was writing last month about some options for a wifi only "phone" that
could be locked down as a unix device (hardened in typical ways) and
completely free from meddling from the over the air updates and fiddling
(and in some cases, DMA access!) that providers have via the mobile
radio...
The best guess, and I think a very good option is:
So the question ... what is the handset ?
If a handheld linux computer (archos ? old compaq ipaq ?) wasn't
designed as a mobile phone, it won't have speaker at the ear and
mic at the mouth as you would expect, so that's difficult. OTOH,
if you use a handheld computer that was designed as a phone, you
have a problem with the tight integration of the mobile modem with
the device, and you lose some control over the modem and its attack
vectors (although if you are running a completely open OS, perhaps
not ?)
Hi John,
The Samsung Galaxy Player is essentially an Android phone without GSM
hardware. It's phone sized and has a microphone and speaker suitable
for making VoIP calls.
I believe it's possible to install CyanogenMod on it to get a
completely free software stack. I don't know whether anyone's tried
connecting a USB GSM modem.
Ok, fine. But out of curiousity, how much risk does a mobile phone with
no sim card add to a solution like that ?
GSM, and 3G, are designed around the sim card, so I understand that
basically nothing can happen at all without it - I feel relatively certain
that a typical carrier deployed base station, etc., is "powerless" against
my phone with no sim card inserted.
But what if I was very tinfoilhat-crazy-paranoid - what kind of scenario
or attack could I be susceptible to if I had an actual *phone* with no sim
card installed (as opposed to a device like samsung galaxy player that has
no mobile radio installed AT ALL) ?
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