Hi

My BlackBerry 8520 intermittently shows no signal and onlu SOS calls available... When i reboot the phone it is fine for a day again...

I upgraded to V5.0.0.592 and still have the same problem.

Does anyone know how to solve this issue, my dad has exactly the same phone with the same carrier and he does not have this issue.

Thanks in advance.

Welcome to the forums.

Perhaps your SIM card is going bad...have you tried removing and re-inserting the SIM card?

Thank you.

Yes i have tried that. The sim worked 100% in my previous nokia.