Ques. i have forgotten my lumia phone password.
Ans. When the Phone is off, press and hold the VOLUME DOWN button, and then briefly press the POWER button.
Release the VOLUME DOWN button when you see an icon (!) on the screen. Then press the following hardware buttons in this sequence: VOLUME UP->VOLUME DOWN->POWER->VOLUME DOWN - the Phone will perform a hard reset.
You will need to set up all your accounts again, as it will put your phone as default settings.
If the above does not work then tell us the model number(520,620, 720 ...) of your phone and we will provide you with your phone specific instructions.