You need your account number to switch your T-Mobile phone number to a new carrier or get information about your T-Mobile account. This number is given to you when you buy a SIM card and a plan from T-Mobile. You also need your T-Mobile account number to change sensitive account information, such as your name or date of birth. The account number is a unique identifier that helps your carrier provide you with information about your account.



T-Mobile and other carriers, including Verizon, AT&T, and Sprint, provide their users with an account number. We compared T-Mobile with Verizon and AT&T to help you understand which is best for you. This guide helps you find your T-Mobile account number for prepaid and postpaid plans.



How to know your T-Mobile account number

There are multiple ways to find your T-Mobile account number. Let’s go through them one by one.

Check your account number online

You can use your T-Mobile online account to get your account number. Go to the T-Mobile user login page and enter your login credentials (your email, phone number, or username, along with your password). When you’re logged in, go to your account page and check the account number displayed in the upper-right corner of your account page.

Find your account number on your paper or digital bill

You’ll find your account number at the top of your monthly paper bill. You can also check the PDF bill to get your account number. It is usually noted in the upper-right corner of the bill. To get the digital bill in PDF format, follow the steps below:

  1. Install the T-Mobile app on your phone from the Google Play Store. This doesn’t work on an iPhone. You need an Android phone for this method to work.
  2. Login with your T-Mobile ID and enter the passcode.
  3. Go to the home screen and choose T-Mobile.
  4. Select Bill from the bottom bar.
  5. Scroll down and tap Download PDF.
  6. Choose either View summary bill or View detailed bill.
  7. A digital copy (PDF) of your bill downloads from your phone. Open it and find the account number in the upper-right corner of the bill.


Add 1 to get your account number

Your account number is easy to know and remember if you are a T-Mobile prepaid account holder. Add 1 to the front of your 10-digit phone number. That is your account number. For example, if your phone number is 1234567890, your account number is 11234567890.

Visit your nearest T-Mobile store

When you pass a local T-Mobile store near you, walk in, ask them to help locate your account number, and they will assist you.

The above methods help you find a T-Mobile account number. You should keep it handy, as it is a unique identifier associated with your T-Mobile account that can help you with your account management.

T-Mobile sign hanging in an office building.

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What is my T-Mobile PIN number?

The PIN number or passcode isn’t the same as if you used to log in to the T-Mobile app or T-Mobile.com account. The PIN or passcode should contain 6 to 15 non-sequential numbers. The PIN/Passcode verifies your account and identity when you contact customer service.


Similar to your T-Mobile account number, your T-Mobile PIN/Passcode is an important identifier. As per the official T-Mobile support, there shouldn’t be any of the below:

  • Sequential numbers (such as 3456789)
  • Repeating numbers (such as 4444)
  • Numbers from the beginning or end of a mobile number
  • A mobile number on the account or your Billing Account Number
  • A Federal tax ID number, Social Security number, or date of birth

You can reset your T-Mobile PIN and get a new PIN using the T-Mobile app on your mobile device or via the T-Mobile website. Let’s go through each method one by one.

Using the T-Mobile app

  1. Launch the T-Mobile app.
  2. Choose More.
  3. Select Profile Settings.
  4. Select T-Mobile ID.
  5. Choose the PIN/Passcode section.
  6. Enter the new PIN and confirm it.
  7. Choose Save. You’ll receive a text message confirming that the new PIN change request was updated.



Using a T-Mobile online account

  1. Visit T-Mobile.com and log in with your account.
  2. Choose My Account from the drop-down menu.
  3. Select Profile and click T-Mobile ID.
  4. The T-Mobile system asks you to confirm your identity using 2FA. Choose the preferred method and click Continue.
  5. In the PIN/Passcode section, click Edit.
  6. Enter the new PIN or passcode and re-enter it to confirm.
  7. Select Save. You’ll receive a text message confirming the update request.


Know these T-Mobile account details to troubleshoot issues easily

If you have issues with T-Mobile services, contact T-Mobile customer service to troubleshoot the problems. You’ll need your T-Mobile account number and your PIN/Passcode handy. If you plan to switch to T-Mobile, check out our list of the best T-Mobile phones you can buy.