You probably know that your iPhone features a simple passcode functionality that secures the device by requiring, by default, a 4-digit PIN to unlock your phone. But as you also probably know, a 4-digit PIN isn't the most secure. To address this, Apple allows you to enter a longer, more secure alphanumeric password (that is, a password with letters and numbers), but, compared to the considerably easier to tap numeric keyboard, the alphanumeric keyboard is a pain to type into every time you unlock. Luckily Apple built in a simple compromise. More »