How to unlock security code in nokia 3110c?

I am having Nokia 3110c phone and to unlock it phone asking for security code that i have forget previously it was 12345 but 12345 is not working now to unlock my phone. Please help me to unlock my phone.

You may contact your network provider…

Get the Security code from service provider.

Hi try default code 12345  or 0000 . It doesn’t work  You can use master reset code to unlock your nokia 3110c security lock. If you need master reset code you can visit this site Unlock-free.com here you can get the code and  unlock your nokia 3110c mobile easily.