How to Use an Alphanumeric Passcode [iPhone]
Full Tutorial: http://gadgethacks.com/how-to/strengthen-security-with-alphanumeric-passcode-for-your-iphone-0160181/
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In this tutorial, I'll be showing you how to apply an alphanumeric passcode to your iPhone's lock screen. Using a password longer than four digits, including letters, helps to beef up your security.

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