another newbie question

[g.roelant at telenet.be]

I want to try to alter the mobile app (in gsm48_rr.c) to listen to all tmsi's. 
i changed the code and altered all if statements where in the else part was the log 'Not for us' 

i'm hoping the phone will start following the conversation with the immediate assignment packages... 
this way i can start logging the beginning of the encryption.... 

am i doing stupid things? or is there already an app that does this? 
thanks 
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