Suddenly asking for security code, 12345 doesn't work

If you do not or have not ever put a security code on the phone I would suggest entering the default for Nokia which is 12345 also to get your IMEI # you can enter # 0 6 # to get simlock info enter # 9 2 7 0 2 6 8 9 # to get software version enter # 0 0 0 0 # these codes do work on the nokia 6110 but not sure if they work on other versions of Nokia phones except the security code is always 12345 if it is default and has not been changed of course you have to get past the security code first.

I was also having the same security code problem. i went to a mobile repairer, he took only 2 minutes and solved the problem:) and demanded only Rs.50