With a four digit PIN, there are a possible 10,000 combinations. But with a six digit code, there are 1 million possible combos, making it a lot tougher for someone to crack your security code.

Instead of 10,000 possible combinations, newer iOS devices will soon have one million. This change affects the iPhone 5S, 6, 6 Plus, iPad Air 2, and iPad Mini 3.

One developer found that nearly one in 10 numerical pass codes users choose to lock their phones are one of five common four-digit combinations to lock their phone.

Simply using a 6-digit PIN instead of a 4-digit one increases the number of possible combinations from 10,000 to 1,000,000. It's a good idea to apply the same logic not just to your phone, but to ...

If you have an Apple or Android phone and you probably do-you have got the option of locking your mobile phone through a PIN code with 10,000 possible combinations.

Though a six-digit PIN should be more secure, since there are more possible number combinations, it turns out it really isn't because we're so predictable with how we choose our PINs.

These are used as a proxy for users' four-digit PIN codes. There are 10,000 possible combinations of digits from 0000 through 9999, and each of those were represented in the dataset.

Regardless, opting for a 6-digit code is always going to be a safer bet, and it provides that little bit of extra peace of mind as you go about your day. How to switch to a 6-digit PIN on iPhone ...