How to reset lock code on Samsung C3312 without using any box or software

This is a simple trick on how to reset lock code of Samsung C3312.

Here are the steps.
1. Make an SOS call, then immediately press the lock button on the side of the unit for 2 seconds until until such time that there will appear the keypad on the screen.

2. Press keypad immediately and will appear on the screen the numbers including the * and # sign.

3. And immediately type *2767*3855*.

4. Then restart the unit.

5. You are done.

NOTE: SOS call must not be ended while performing the operation.

100 PERCENT TESTED BY ME!!!