Yesterday morning I could not remember the password for the home screen. If you enter the wrong numbers it lets you wait 30s and then can try again. I finally remembered my passcode and got in, but it does worry me that you do not have the option of using your puk code to reset the passcode. The only option was bringing it to a service center and they reset the phone by reflashing it? I suppose it's a good security measure but annoying at the same time. So write down your code just in case it happens to you.