I need to add my son Jon Vigil onto my account to be able to make changes to his phone. (second one on my account)
Set up line permissions
If you want to give him the ability to to manage the account just as you do (with the exception of canceling lines) you can call us and request his name be added as a authorized user.
Retrieving data ...
Manage your T-Mobile account
Use the T-Mobile App or your My T-Mobile account
We're here to help