Hi tysotaru
Welcome to BlackBerry Support Forums
Have you tried your SIM on another Device or you can try another SIM on your Curve 8520 it will let you know if it a Network problem or the problem is within your device .Please go through this Knowledge Base :
KB03448 : Network status indicator shows " SOS " on the BlackBerry smartphone
Prince
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If Problem Resolves mark the post(s) as " Solution ", so that other can make use of it.
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Click " Like " if you want to Thank someone.
If Problem Resolves mark the post(s) as " Solution ", so that other can make use of it.
