Change Your iPhone to an Alphanumeric Passcode
By Leanne Hays
Touch ID and Face ID are great iPhone security features, but if you want the best protection for your device, you need an iPhone passcode. Apple's default six-digit numeric passcode is already pretty hard to crack, but you can change your iPhone passcode to one that's even more secure. You can change your iPhone's passcode to an alphanumeric code that's six digits or longer.