NOKIA i cant unlock my nokia phone the security keyguard.

Hi,What is your Nokia Mobile Model?
Try Nokia default security code like 0000 or 1234 or 12345.
If it does not work you can reset your phone easily by using Master Reset Code.You can get this code at free of cost from the site Unlock-free.com here they are providing this code for some old model Nokia DCT Mobile Phones and reset it.

Get Master Reset Code and unlock the security lock . Many site provide this code .Google it and use the code.