If you are talking about a screen lock password, then after a fixed number of incorrect entries your phone should prompt you for the password for the gmail account the phone is registered to. If that doesn't work, shut off the phone, log into the gmail account on a website and change the password using Google's password recovery. Once the new password is confirmed, turn on the phone and try using the new password.
If you do not have either enabled, then I'm afraid you would have to factory reset the device, which would mean that you loose all user data from the phone and have to set up from scratch.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.