One way is to try default codes, try contacting phones tech support for default codes or try master reseting your phone, in case if yours is a nokia phone
try reseting it using master reset codes from http://www.simpleunlocking.com/nokia-dct-master-code-service/rs16wp10/
Try resetting it
This is copied directly from the manual - check out #5 at the bottom.
Hope it helps!
7.7 Security
The Security menu allows you to
secure the phone electronically.
1. Open the flip and press
[MENU]
2. Press Settings & Tools.
3. Press Phone Settings.
4. Press Security.
5. Enter the four-digit lock code.
The lock code is the last 4 digits
of your mobile phone number if
it is set. The lock code is the last
4 digits of your MEID if your
mobile phone number is not set.
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