I lost my security code of nokia 1600................my imei code no. is 358370001569842............plz give me the way 2 unlock my phone

You can get the Nokia 1600 Master Reset Code from this site
Unlocking4u.com and Reset from security Lock.

SECURITY CODE:

If you are talking about the security lock code to enter into the phone then once it is lost nothing can be done except flashing the mobile . Because if anybody can give the security code created then who ever who steals your phone can get into it and get your valuable information.

So as safety precaution to avoid that they have designed it such that if you forget the security lock you have to reset the mobile memory by flashing the mobile at an authorized service center.So while flashing the mobile all the data in the mobile memory will be lost and you can again start using the mobile.