Tap Change Passcode (in blue text in the third ... From the menu that pops up, select 4-Digit Numeric Code, and the number of blanks in your new passcode will drop from six to four.

Here's how to change it to keep your iPhone data safe by changing your lock ... digit passcode. It's done so since iOS 9 in 2015. You may just have missed that fact if you use a four-digit code ...

Having an unlocked iPhone–without so much as a four-digit barrier between you and some ... the privacy of your personal information. This code is no mere PIN, but a genuine password complete ...

You can then switch your passcode among 4-Digit Numeric Code, 6-Digit Numeric Code, Custom Numeric Code, and Custom Alphanumeric Code. Make your choice, then type your new passcode .