What an authorized user is and why you might add one

An authorized user on a T-Mobile account is someone you give permission to manage that line — they can check the bill, make changes to the plan, add features, or handle customer service calls on your behalf. T-Mobile doesn't require them to be a family member, though most people add spouses, adult children, or trusted friends.

The key thing: an authorized user can make decisions about the line, but they don't own it. You stay responsible for the bill. If you add someone as an authorized user and they rack up roaming charges or change the plan, you pay for it. That's why you should only add people you trust completely.

People add authorized users for practical reasons — a parent managing a teenager's line, a spouse handling family billing, an adult child helping an aging parent with their account. It saves you from having to be on every call or handle every small change yourself.

Key Takeaways

  • An authorized user can manage a T-Mobile line on your behalf, including talking to customer service and changing plan features, but you remain the account holder and responsible for all charges.
  • You can add an authorized user through the T-Mobile app, the website, or by calling 611 from a T-Mobile phone or 1-844-839-4644 from another phone.
  • T-Mobile will ask for the authorized user's name, phone number, and date of birth, and may ask security questions to confirm your identity before making the change.
  • You can remove an authorized user at any time through the same channels, and they will lose access to manage that line when ready.
  • An authorized user is different from adding someone to your family plan — that person would have their own line and their own charges, not just access to manage yours.

How to add an authorized user through the T-Mobile app

Open the T-Mobile app on your phone and sign in with your account credentials. Tap the menu icon (three horizontal lines) in the bottom right corner, then select "Account" or "My Account" depending on your app version. Look for a section labeled "Authorized Users" or "Manage Authorized Users."

Tap "Add Authorized User" and enter the person's full name, phone number, and date of birth. T-Mobile will ask you to confirm your identity — usually by answering security questions you set up when you created the account, or by verifying a code sent to your phone. Once you confirm, the authorized user is added and can start managing that line right away.

Adding an authorized user on T-Mobile's website

Go to t-mobile.com and sign in to your account. Click on "Account" in the top menu, then look for "Authorized Users" or "Manage Account Access." The exact wording shifts between redesigns, but it's always under account management.

Click "Add Authorized User" and fill in the same information: name, phone number, and date of birth. T-Mobile will verify your identity before saving the change. Once it's done, you'll see the authorized user listed on that page, and they can start using their access when ready.

Adding an authorized user by phone

Call T-Mobile customer service at 611 from any T-Mobile phone, or 1-844-839-4644 from another phone. Tell the representative you want to add an authorized user to your account. They'll ask for the person's name, phone number, and date of birth, and will verify your identity by asking security questions or sending a verification code to your phone.

The phone route takes longer than the app or website, but it's useful if you're not comfortable navigating the digital options or if you want to ask questions while you're doing it. The representative can also explain what the authorized user will and won't be able to do on your account.

What an authorized user can and cannot do

An authorized user can view your bill, change plan features, add services like international roaming or hotspot, make payments, and talk to T-Mobile customer service about your line. They can also authorize repairs or upgrades. Essentially, they have the same power to manage the line that you do.

What they cannot do: they cannot change the account holder (you), remove themselves as an authorized user, or change the account's security settings like the PIN or security questions. Those protections stay with you. They also cannot add new lines to your account or change your billing address — those are account-level changes that only the account holder can make.

Removing an authorized user

You can remove an authorized user anytime through the app, website, or phone. In the app or on the website, go back to the Authorized Users section, find the person's name, and select "Remove" or "Delete." Confirm the action, and they lose access when ready.

By phone, call the same numbers and tell the representative you want to remove an authorized user. They'll verify your identity and remove the person from your account. Once it's done, that person can no longer manage your line or see your bill.

Security and privacy considerations

Adding an authorized user means giving someone real access to your account information and the ability to make changes that affect your bill. Only add people you trust completely. If you're adding a teenager, remember they'll be able to see what you're paying and what services you have on your account.

If you think someone has unauthorized access to your account, change your security PIN and security questions when ready through the app or website, or call T-Mobile. You can also remove any authorized users you don't recognize. If you see charges you didn't authorize, report them to T-Mobile right away — they can investigate and may reverse fraudulent charges.

Frequently Asked Questions

Can an authorized user see my bill and payment history?

Yes. An authorized user can view your current bill, past bills, and payment history for that line. If you want to keep that information private, don't add them as an authorized user — instead, you can give them limited power to handle specific tasks by calling T-Mobile and asking about account restrictions.

What's the difference between an authorized user and adding someone to my family plan?

An authorized user manages your existing line but doesn't have their own line or their own charges. Adding someone to your family plan gives them their own phone number and line, with separate charges that appear on your bill. Choose authorized user if they just need to help manage your account; choose family plan if they need their own phone service.

Can I add an authorized user if I'm not the account holder?

No. Only the account holder can add or remove authorized users. If you're on someone else's account and need to manage it, ask them to add you as an authorized user.

Does adding an authorized user cost extra?

No. T-Mobile doesn't charge a fee to add an authorized user. The only charges are the regular ones on your line.

Can an authorized user change my plan or add new lines?

An authorized user can change features and services on your existing line, but they cannot add new lines to your account or change your plan type. Those account-level changes require the account holder to make them.