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are you asking for security code for your nokia 3100? if you forgot your security code then try default code "0000" or "1234" and if it does not work then go for master reset..try unlock-free to get master reset code for your mobile and reset your mobile..
It's generally a hardware problem, meanly on the RF IC or the Diplexer (they call it antenna switch) which a service guy would replace (a hit-and-miss process), but there's a lot of support components around it that can go wrong, which only a good service shop with proper equipment can do. If it's justifiable go to a Nokia Service Center
if handset is not able to recieve the signal means (no signal bar on the screen means)go to phone settings and search manaully even you didnt get any operators VCTCXO is the problem by replacing it you can solve this .
if you get the operators by manuall search and you couldnt access , problem with UEM or by PA(power amplifier)