T-Mobile: How to Add an Authorized User

Adding Authorized Users to Your T-Mobile Account: A Step-by-Step Guide

As you navigate the world of wireless communication, it’s not uncommon for friends or family members to rely on your cell phone plan for their own connectivity needs. As a responsible T-Mobile customer, adding authorized users (also known as “line adds”) is an excellent way to share your data allowance and produce managing multiple lines easier. In this article, we’ll explore the process of adding an authorized user to your T-Mobile account in detail.

Understanding Authorized Users

Before diving into the how-to section, it’s essential to grasp what authorized users are on a T-Mobile plan. An authorized user is someone who shares your line and has access to some or all of its features, such as data allocation, voice minutes, and text messaging. This individual can use their own device with the shared account details.


Before proceeding, make sure you:

  1. Have an active T-Mobile plan.
  2. Are aware of the monthly fees assocaited with each additional line add (see T-Mobile’s official website for pricing information).
  3. Know your current account password and are prepared to provide it during the authorization process.

Step 1: Log in to Your MyT-Mobile Account

Open a web browser on your device and navigate to myt-mobile.com. Sign in with your username (your T-Mobile phone number or email address) and password. If you’ve forgotten your password, reset it according to the prompts.

Step 2: Access Your MyT-Mobile Account Profile

After signing in, click on “My Profile” located at the top-right corner of the page. This will take you to a dashboard displaying information about your account.

Step 3: Add an Authorized User (Line Add)

Scroll down and locate the section labeled “Manage Plans.” Click on this option. In this menu, select “Add or edit lines.”

Here, you’ll be presented with three options:

  1. New Line: Create a new line add for another phone.
  2. Transfer Line: Transfer an existing line (e.g., from someone who is no longer using their account).
  3. Line Settings: Update the settings of your primary or current line.

Click on “New Line” to start the process of adding an authorized user.

Step 4: Enter Authorized User Information

Enter the necessary details for the new line add:

  1. First name, last name, and phone number (or email address).
  2. The desired account password and confirm it.
  3. Choose whether this line will be a Primary or Secondary device on your account.

Once you’ve filled in these fields, click “Next” to proceed.

Step 5: Verify Authorized User Information

Verify the information for the new line add is accurate. You can modify any mistakes at this stage by clicking “Edit.” If everything appears correct, select “Submit.”

T-Mobile may perform an authentication process during or after submitting your request to ensure the authorized user’s identity and account security.

Step 6: Set Up Authorized User (Line Add) Settings

You’ll be taken to a new menu where you can configure settings for the added line:

  1. Account Type: Determine if this is a primary, secondary, or add-a-line device.
  2. Plan Details: Review and update plan information as necessary (e.g., change data limits or adjust voice minutes).
  3. International Settings: Configure international calling settings if desired.

Take your time to ensure you’ve set the correct account type and any additional options are configured accordingly.

Step 7: Confirm Authorized User (Line Add)

Review a summary of your new line add, including the authorized user’s information and plan details. If everything appears in order, click “Submit” to complete the process.

That’s it! Your authorized user is now part of your T-Mobile account. Remember that you’ll need to manage each additional line individually within MyT-Mobile to make any necessary changes or updates as needed.


Adding authorized users (line adds) can greatly simplify the management of multiple phone lines on your T-Mobile plan. By following this step-by-step guide, you’ve successfully onboarded a new user with shared account details. Ensure you stay informed about ongoing costs and adjustments to individual line settings within MyT-Mobile for optimal wireless experience.