Try rigorously cleaning the sim card and phone connections (also battery connections - after reading forums the batteries on V3's are often to blame for their problems) with a cotton bud then leave the phone off without the sim card in it and charge it overnight. Then put in the sim card and turn the phone on. This might help. My V3 often says Insert SIM and it is very annoying so i'm getting rid of it but those methods have worked for me.
Hope this helps
Mowcius
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