The T-Mobile portal is a self-service website and mobile app that allows T-Mobile customers to manage their accounts, view and pay their bills, check usage, change plans or add-ons, add a person, manage devices, data, and Internet, and get help.

To access the T-Mobile portal, customers need to log in with their T-Mobile ID and password. Once logged in, customers will be able to see a summary of their account information, including their plan details, usage data, and upcoming bill amount.