Blackberry 8520 I can not call or write sms

I can not call or write sms, mobile network signal and my phone shows sim card is fine in another phone works

Hi and Welcome to the Community!
Is it possible that your BB remains locked to another carrier? If so, that would explain this behavior...refer:
http://supportforums.blackberry.com/t5/General-BlackBerry-Functions-and/Unlocking-your-BlackBerry-Gu...
Otherwise, your SIM could be incompatible with your BB...for which you would need to talk to your SIM provider.
Good luck!
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.
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