As tempting as it might be, avoid using 0000 as your four-digit PIN code. Same goes for 1010, 1111, 1122, and 1212, which comprises the top five worst PIN codes, according to a list compiled by ...

In fact, a 4-digit code only has 10,000 possible combinations. Even if you did try to use a more complicated one, you'd inevitably use the same one as someone out there — or multiple someones.

Adopting longer PINs isn't without challenges. International travelers, for example, may find themselves unable to use ATMs that only accept 4-digit codes. In such cases, truncating a longer PIN to ...

Any airline passenger with the letters “SSSS” printed on their boarding pass has been selected by airport security for extra screening.

Apple does let people backslide. Tap Passcode Options, and you can pick the older 4-Digit Numeric Code. Most people never tap for options, however. Oh man, the @FBI is going to be pissed at this one.

Any airline passenger with the letters “SSSS” printed on their boarding pass has been selected by airport security for extra screening.