This feature will allow you to lock your number to the carrier. This feature prevents SIM swapping which is a legitimate concern. With that said, during the ordering process, the customer will be able to choose to lock their number.
If the customer chooses to unlock their number, they will be required to provide a code through their authenticator app. If this is not possible, then an OTP code will be sent via SMS or email. If you choose the email option, it will be best to use an email address that isn’t public. This will prevent the hacker from getting a hold of the appropriate address. Your number must be unlocked to move it to another carrier or a new device.