Is this a work phone? Do you have access to work email/contacts/calendar via an exchange server? If so, your exchange server's administrator has probably implemented a policy that requires a PIN, Pattern or Password lock. You cannot disable the lockscreen as long as you are connected to an exchange server with those requirements. Its one of the reasons I don't use exchange on my phone for work email. I just access via POP or IMAP. I don't want some moron in my IT department to be able to remote wipe my device just so I can delete emails.
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