How do you find out your cell phone's PIN?

The answer would depend on what type of pin you are looking for ... If its a Voice Mail pin to your phone that you can't remember you would have to call your service provider ... If it a security pin for the phone to unlock the phone your would have to do the same thing call your service provider ... NOW if it a security pin for you phone settings and you did not set one more then likely its 0000 or 1111 ... But if you had set a pin for your phone's settings and can't remember it ... You would have to call the phones manufacturer ...