yeah i'm having some problems with my sim card .its not working on my blackberry but working on my nokia ..but sometimes when i use it on my nokia it says insert sim 'i have tried another type sim on blackberry and it works fine
Given what you describe, I would deduce that your Cell C sim card is damaged, defective, or otherwise unsuitable. Replacement would be advised.
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.