Technically, there is no such thing as a CDMA nor GSM SIM card. There are SIM cards, and there are not. CDMA or GSM is a function of the radio that is physically built into the device, not a function of the SIM card.
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.