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.

It appears the hackers set up two-factor authentication on O'Campo's account, so the 6-digit code O'Campo needs to get back into her personal account is going to the hackers, not to her.

Now, tap Passcode Options and select 6-Digit Numeric Code. Finally, enter your new PIN twice to confirm the setup. Simply using a 6-digit PIN instead of a 4-digit one increases the number of ...

Your credit card has a 16-digit number on the front, plus an expiration date, and another three-digit code on the back. We all know in a vague way that the code on the back (also known as the "CVC ...