When it comes to porting multiple numbers, T-Mobile's Porting Department typically allows customers to transfer more than one number at a time, but there are specific guidelines to follow. The number of lines you can port will depend on your current carrier's policies and the type of account you have. It is important to ensure that all the numbers you wish to port are listed under the same account with your current carrier. Additionally, each port request may need to be initiated individually, depending on the system in place by T-Mobile and the existing carrier. For the most accurate and personalized information, it may be helpful to refer to the official T-Mobile website or check the relevant sections regarding number portability. This way, you can find detailed instructions and any potential limitations that may affect your porting process.