Wirelessly posted (BlackBerry 9000: BlackBerry8300/4.2.2 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/102)
The unlock codes are specific to the IEMI that the code was issued for.
Sprint is CDMA and I have only used GSM carriers. I don't even know if you can unlock a CDMA phone for use on other carriers since they don't use SIM cards, do they? An unlocked GSM phone can be used on any GSM carrier...that's the advantage. Without it being unlocked it can only be used on its branded carrier.
BES 4.1.6 Exchange 2003 SP2