Disable Passcode

After downloading iOS 7 I am prompted to enter a passcode, this wasn't present on previous iOS 6 etc version. I have followed the instructions General-Settings-Enter passcode-Tap Turn Passcode Off. This doesn't work. I haven't a MS Exchange account as some have noted. I am an individual home not a corporate user. I have read that many users have had this difficulty I have had no success at all. Apart from downgrading the iOS which seems so complicated does anyone have a solution. My thanks in advance

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