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I'm going to show you something that could potentually....
Save you recieving a very large bill from the App Store....
Go Settings, General, scroll down to Resrictions...
Then 'Click' on Enable Restrictions add a PIN-Code
You'll need to do it twice on your first attempt....
Two things to remember there....
First use a more complicated PIN-Code...
Than the one I've just added and I stongly recommend....
You do not use the PIN-Code on your 'Lock Screen'....
Towards the bottom you'll see 'In-App Purchases....
Turn the green button off...
Just go up to the top General, Settings....
Then back out to your 'Lock Screen' that is how....
Save a very large bill from the App Store.