How to unlock Nokia s40 Mobile when it is locked

This is simple trick to unlock your phone when locked, but this type of trick only works on old Nokia models. Just follow the procedures below

HOW ?
1. Assuming the phone is locked.
2. Dial 112. (you assume the fact that nothing will come up after typing). It will show up after dialing.
3. Wait for a maximum of 3 seconds (you can wait for long as 5 seconds but you know why to avoid that).
4. After the 3 seconds cut or end the call using the right soft key on your keypad and "immediately" press  the  menu button.
Note:
Press the button as soon you cut the call to navigate or select through the menu. Or else you will be struck again on the standby screen.
5. The phone menu will appear. But you will noticed your phone is locked again. But that's normal just repeat the previous 2,3,4 step until you reached where automatic key guard is in the settings menu.
6. When you're on (Automatic key guard) just turn it on, and set the delay time as you wish e.g. i set up to 50 minutes on my own phone.
Notice:
On each and every procedure, you should be using the call and dial method.
Why not longer than 3 seconds? if you tried it you may have noticed that navigating through was a bit slow, may be the phone taking long time to respond.
7. Now press or hit the back button because your phone keypad is now unlocked.
Working perfectly on Nokia 2700. It only works on phone that have center button and others, and it might not work on the Nokia devices like c1-01, c2 e.t.c