How can i open my samsung galaxy y if i forgot its screen lock?
You can open your Samsung Galaxy Y if you have forgotten the screen lock by attempting 5 times. After this maximum limit of attempts, you will be asked to reset your password. You can also try using a Screen Lock Bypass, which allows you to unlock the patterns or PIN. Go to http://androidadvices.com/unlock-android-phone-forgot-pin-password-screen-lock/ for details.
reformat the os via computer
you need to flash the phone, factory reset