This phone cannot be unlocked as its built in iDEN technology. Only phones on the GSM network can be unlocked. You cannot modify a CDMA/TDMA/iDEN phone to GSM.
hey thanks for getting back to me. so what you are saying is there is no way to swap in another sim card if it is not an boostmobile one.
What I am saying is eventhought your boostmobile has a simcard in it, it really isnt a true GSM simcard. You can use Nextel phones on Boost service from what I heard. What you cannot do is to use an ATT, cingular, tmobile simcard in your Nextel phone. THe simcards will fit in the slow but nothing will happen.