I can not turn off the Passcode Lock. If I go to General --> Passcode Lock ....... It keep on "On" position.
If I tap it the screen "Turn Passcode Off" is in Grey (passive)
Do you have an Exchange mail account? If so, this can enforce stricter security rules which, for example, force you to have a passcode and remove the option to turn off the passcode. It's a security thing.
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