Update your SIM card

    Learn how to update or change your SIM card online.


    You may need to update your SIM card if:

    • You've purchased a new phone, tablet, or internet device that uses a different type of SIM card.
    • You're replacing a lost, stolen, or damaged SIM card.
    • You got a new SIM card to unlock new features, such as Wi-Fi Calling.

    Note: Voicemail and downloaded Visual Voicemail messages will be deleted when changing your SIM card.


    T-Mobile SIM Card Number

    To update your SIM card:

    1. Back up any contacts you saved to the SIM card, using Gmail, iCloud, Microsoft account, an SD card, or other options. This varies by device.
    2. Check the type of SIM card your phone needs. See SIM card types.
    3. Make sure you have the SIM card type your phone needs. If you don't have the correct type, you'll need to purchase a SIM card.
    4. Find the new SIM card number. It begins with 8901.
    5. Go to http://my.t-mobile.com/SIM.
    6. Log in using your mobile number and My T-Mobile password.
    7. Follow the steps on the page. Keep in mind, it may up to 2 hours for your new SIM card to work.
    8. Insert the new SIM card into your phone. If you need steps, you can find them on the  Phones page.