Is your phone Network locked or Security locked?
If Network locked,You can use unlock code to unlock the network lock of your Nokia . If it is Security Locked, then to unlock security lock try the default security code like 1234 or 0000 or 12345 . If those didn't work then you can use master reset code to reset your Nokia . It will reset your phone, removing any security locks(except network locks) .
If your phone is old model Nokia phone then you can get the Network Unlock code and Master Reset Code for free from
Unlock-Free.com .
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