I figured it would be a good idea to post this as it can help justify why devices have the numbers they have on the device. Most are GSM and that is where it becomes confusing because there are three models for GSM devices.
Also posted by Shadow.xXx
xx00 are GSM devices (can have WiFi and GPS)
xx10 are GSM, with GPS (only)
xx20 are GSM with WiFi (only)
xx30 are CDMA devices
xx50 iDEN Direct Connect + GPS + WiFi
Also keep in mind while unlocking. When you unlock your device, it is letting you move to another carrier. Your device comes locked to your carrier. CDMA (phones that end with xx30) can be unlocked to work on GSM and CDMA carriers, GSM (phones that end with xx00, xx10 or xx20) are not able to work on CDMA networks only GSM. I hope this helps members some up a few things, and more less for the new users.
Stated by tavella81:
The only CDMA Blackberry that can work on a GSM network in North America is the 9530 (Storm). The 8830 is the only other CDMA Blackberry with a SIM card slot and does not support any North American GSM frequency bands.
The 8130 (Pearl), 8230 (Pearl Flip), and 8330 (Curve) do not have SIM card slots and will only run on a CDMA network.