Security Code Problem for NOKIA C3-00

Nokia C3-00 :-Default Security Code & Troubleshooting!

Try the default security code 12345. If it is not accepted, your phone needs repair.

If you reset your phone, the code is set to not defined, or reset to 12345.

source: www.nokia.com/in-en/support/product/nokia-c3-00/faq/?action=singleTopic&topic=FA141370