I'm having great difficulty deleting my password off my phone, it's a real pain having to type it in all the time when I want to use my phone quickly, but when I go to lock screen options and type in the password like people tell me all of the other options are greyed out - what I want to press is 'none' but, like I said, it's greyed out and won't let me press it. I would appreciate any help you might be able to give me?