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.