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