this is exactly what i did and now is recognizing an at&t (old desactivated) and a tmobile sim(old desactivated) card but i need to test with an activated one. i noticed with the tmobile one a gsm networks setting appeared on my menu.
see post 29 & 30
by the way the razr needs to be running gb i was on ics leak but i didnt find any charge only mode or pc mode.
i went back to ics leak and seem to still working but like i said i need to test and activated sim card
before people start to flame im not taking credit and im not interested on any im just sharing what i did.
one more thing this is radiocomn software link:
Sent from my DROID RAZR using xda premium