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. Not too long ago, Apple changed from having a four-digit code as the default to an even-harder-to-crack, six-digit code as the default. Better yet, you can set an alphanumeric code that's six digits or longer as your iPhone passcode. If you're looking for the best security code possible, an alphanumeric code is your best bet. Let's get started learning how to set a new passcode on your iPhone now.