The phone lock code protects the contents of your phone from un-authorised use. When the phone lock code is turned on, it needs to be keyed in every time you turn on your phone and when it has been in sleep mode.
If you’ve enabled security code on your Nokia phone, you can turn it off by following the steps below:
==> Go to Settings
==> Scroll to Phone settings
==> Scroll to Security Keyguard settings and toggle it to “OFF”
==> Key in the phone lock code (default is 12345)
If you’ve forgotten your security code, read this tutorial to learn what to do.
This tutorial helped in turning off security code on Nokia Asha 210.