Re: off-topic apologies - how to unlock sim (not phone) - baseband-devel

22 Feb 2011

Hi,

the phone does not seem to be involved in this topic. It's only about the
SIM.

And you can't flash a sim like a baseband. That would be too easy.

Sebastien

On Tue, Feb 22, 2011 at 3:28 PM, Marius Cirsta &lt;mforce2(a)gmail.com&gt; wrote:

...
   A nicer fix would be to flash it with some open
source firmware :).
 That would be cool and I guess it's what this project is all about.

 On Tue, Feb 22, 2011 at 5:24 AM, Harald Welte &lt;laforge(a)gnumonks.org&gt;
 wrote:
  On 02/20/2011 02:07 AM, Scott Weisman wrote:

 I apologize for this in advance. I figure the collective GSM knowledge
 here might be able to help me. 
 Well, I think it is interesting from a 'scientific' point of view, i.e.
 understanding how such mechanism is implemented.

> I have a SIM card that can only be used on one phone. The phone itself  is
   unlocked.
But the SIM won't work on any other phone. Does anyone know
 anything about this or how to unlock a SIM to work on any phone? 
 I think the first step is to trace what is happening between phone and  sim
  card, possibly by using osmocom simtrace.

 Once you have a trace, you can look at the messages and try to identify  the
  mechanism the SIM uses to identify the phone. 
After that, you could
 possibly implement a small program for a proxy SIM like bladox or  RebelSIM
  which patches the messages to make the SIM card
happy.

 All in all not an easy undertaking, but it can definitely be solved.

 Regards,
  Harald