A 4-digit iPhone passcode is about as insecure as it gets, and this black box can figure yours out in just a few days. So it's time to consider better security.

iOS asks for 6-digit passcodes by default when setting up a new iPhone or iPad. Here's how to go back to 4 digits ...

While a six-digit passcode is always more secure compared to a four-digit passcode, it's also more frustrating to remember and enter whenever prompted. Thankfully, there's a way to revert to using ...

Interestingly, if you put a 4 digit numeric passcode in in the non-simple passcode mechanism, it helpfully switches simple passcode back on for you.

Six-digit passcodes offer 1 million possible combinations instead of 10,000, making a passcode harder to crack.

Head to "Settings" to set up a 4-digit password on PS4. Taylor Lyles/Business Insider 3. Scroll down and then click on "Login Settings." 4. Once the next page loads, select "Login Passcode ...

With this enabled, you'll only need to enter a shorter, simpler four-digit number to authorize iTunes and App Store purchases, rather than your full iTunes account password.

Apple puts two factors front and center to secure accounts in iOS and OS X, while suggesting a longer passcode in iOS 9.