Hi,

There is typically more than one CPU on the phone, one for PDA stuff, the other provides the 3G/2G/GSM etc. stack, and is often connected together via serial lines.

It would not be running Linux, more likely a real time operating system like Nucleus, etc.

The IMSI is stored on the SIM card, but the IMEI is hard coded number used like the phone's MAC address.

I would be impressed if you could somehow figure out how to do it, maybe trying with:
- sending a "special" SMS, like the unlockers do
- fuzzing the 3G stack
- JTAG pads
- use the ARM chip to fuzz the serial line or syscalls.
- etc


Ciao!

Justina B.