HOW TO UNLOCK ANY PHONE WITHOUT KNOWING THE SECURITY CODE

Before I explain how you can unlock a phone without knowing the security code, I will like to share this short experience of mine with you. 

I could remember a particular time which I got a phone from one of my brothers after he got another new phone. Way back then, (before giving me the phone) he used to lock the phone with a security code. The security code gets activated automatically each time the phone keypad is locked. On a particular day I decided to lock the phone keypad before keeping it in my pocket to avoid dialing any number by mistake. As I locked the keypad, the phone displayed "keypad locked with security code" I knew I would have to give the phone to my brother to unlock for me as he doesn't like sharing his codes with anyone. When he unlocked the phone, I told him to tell me the security code in case of next time but he refused. This made me unhappy because I saw it as a stupid thing to own a phone whose security code you don't know. Infact, It's really absurd! This made me embark on a research on how to unlock a phone locked with security code without having to know the code. My research was successful, If not, I wouldn't be sharing this with you because you may find yourself in a similar situation as this. From my research, I discovered two methods of unlocking a phone without the security code, the first method works on some old models (not all) of small nokia phones. You just have to try it first and see if it'll work on the model of the nokia phone you are dealing with. The second method works on any type of nokia phone.

Now the first method.

Take the phone locked with security code

press and hold the unlock button for a while without releasing it.

the phone will display now press * 

quickly press the star button and the phone will be unlocked

Second method 
This method deals with the serial or imei number of the phone.

while the phone is not yet locked, dial *#06# to get the imei or serial number of the phone. Write down the 15 digit imei number somewhere 

Go to www.unlockitfree.com

When the page loads, select, free remote master code

In the area provided for imei/serial number, insert the serial/imei number of the phone. 

Click on generate.
Once done, a number will be generated, that's the master code for the phone, copy and keep the number. When ever that particular phone is locked with security code and you want to unlock it, even though you don't know the phone's security code, just enter that number, i.e. Master code and it'll be unlocked! 
please note that This is for educational purpose only, do not misuse it on your friends' phone.
your comments will be highly appreciated.