In a nutshell: To transfer the primary account holder on a T-Mobile family or business account, the current holder must contact T-Mobile customer service. Both the current and new account holders need to verify their identities by providing government ID photos and personal information. Before starting, check T-Mobile coverage in the
If you are the primary account controller of a family T-Mobile account and want someone else to take over that role, you need to learn how to change the primary contact for the account. That is to say, change the primary account holder. Same if you have sold your own business and need to transfer the T-Mobile business account over to the new owner with it. Fortunately, though the process may take some time, it should be relatively simple and easy.
T-Mobile will require you and the new account holder to verify your identities. You should therefore have photos of each of your government IDs, in case they are requested.You should also have personal information and contact information for both you and the new primary account holder.Make sure that you know the answers to your security questions, if any.
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Make sure that this will all work out before taking the process too far and finding all your effort was wasted.
There is no other way to change the primary account holder, because of security concerns. While it is true that you can manage account roles and user permissions with the T-Mobile app, it is not capable of switching primary account holders. That is a high security operation that requires human supervision.
If the new primary account holder is already on your account as a user, the process will be faster and easier. However, it shouldn't make too much of a difference if they are not.
This may include talking to the new primary account holder, so you should make sure they are standing by, just in case.
If any problems arise at any point in the process, call a T-Mobile customer service representative to get some help. The T-Mobile customer service center is open 7 days a week, 24 hours a day. You might want to call during business hours, however, as it is possible that people from other departments might need to be involved. Depending on the circumstances, the process may take days to complete.

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