T-Mobile's Port Out Protection was created as a security tool designed to prevent a criminal from moving your T-Mobile phone number to another wireless firm without your permission. This would be attempted as part of a more ambitious plot to take over your mobile account, change all of your passwords, and rifle through your financial apps cleaning you out. Obviously, the Port Out Protection tool is important and is one of several features offered by T-Mobile that can keep a criminal from taking over your account.