I forgot my phone lock cord because long time i did not use

What is Mobile Phone Model and Brand?Because if you don't know the code means you can reset it using the master reset code,You can get the master reset code from here
Unlocking4free.com/free-unlocking-tools and reset it, Before that use some default code.0000 or 1234 it's for Nokia Only It's not work means get the master reset code there...You can specify the Mobile Brand and Model that is Important..There You can get MASTER RESET code for Nokia DCT Phones and Alcatel OLD Phones Only...

Try calling the service provider get the master reset code and reset it.