Latest questions about "unlock error"

I have Samsung Galaxy Duos. Now it is locked in McAfee Security with a password. The password is both letters & numbers, but letters are not appearing in my phone so I can't unlock my phone.

I downloaded Kakasoft Folder protector from here and used it to protect folders in my thumb drive.

I am having a problem unlocking my Samsung Galaxy y Duos phone due to accidental simultaneous pattern unlocking when my phone was in my pocket.