off-topic apologies - how to unlock sim (not phone)

Marius Cirsta mforce2 at
Tue Feb 22 15:28:14 CET 2011

 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 <laforge at> 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

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