New to T-Mobile? Switching is easy Set up your device Using the app Sprint Migration Center All get started topics Ways to pay your bill All about your bill Line permissions Your T-Mobile ID Your PIN/Passcode All account resources topics T-Mobile network In-flight texting and Wi-Fi Wi-Fi Calling International roaming Mobile Without Borders All network & roaming topics Find the right plan Netflix on Us HotSpot plans Voicemail Use Mobile HotSpot All plans support topics Tutorials Troubleshooting Unlock your device Protect your device SIM card & eSIM All device assistance topics Get T-Mobile for Business Billing and payments Manage your account Orders and shopping Account Hub registration All business support topics

The SIM card or eSIM is your device's ticket to the T-Mobile network!

What's a SIM card / eSIM?

SIM card

  • A SIM card is a small chip that contains information your device needs to connect to the T-Mobile network.
  • T-Mobile SIM cards come with adapters to allow for use with Nano, Micro, or Standard SIM sized devices.


  • Embedded SIM (eSIM) is just a SIM card gone digital, so you don't have to wait for a physical SIM. 
  • Just download your eSIM over Wi-Fi and connect to the T-Mobile network in minutes!

Set up your SIM card


I’m a T-Mobile customer


If you're an existing T-Mobile customer upgrading to a new device, contact us to activate your new SIM card before following these steps.

  1. With the device off, open the SIM card tray and insert the SIM card. 
    • For orders with multiple devices, use the order confirmation email to verify which SIM card goes in which device.
    • Here's a short video to guide you through the process.
  2. Turn the device on. Your service should be working.
  3. To transfer data from your old device, review Set up a new T-Mobile phone.

I'm a Sprint customer who received a T-Mobile SIM card


The steps for activating your new SIM depend on which SIM card you got:

If you received a T-Mobile SIM in the Magenta, please follow the enclosed instructions or visit to activate.

SIM card inside a magenta sleeve that says "Experience our bigger and better network" and has the words "SIM Kit" with T-Mobile and Sprint logos.


If your SIM card didn't have a Magenta sleeve, choose which device type you're activating:


I'm a T-Mobile Home Internet customer


If you just signed up for T-Mobile Home Internet, the SIM card is already in your device and active! Check out T-Mobile Home Internet Support for information on device placement and setup.

If you've just replaced your Home Internet Gateway, You'll need to remove the SIM card from your old gateway and insert it into the replacement. Choose your device:

Buy a SIM card

Set up your eSIM

If you're switching between Apple & Android, don't have your old device, or have a Prepaid plan, contact us to activate your eSIM before following these steps.


Apple iPhone


There’s a few ways to setup your eSIM:





  • Make sure you're connected to Wi-Fi and choose to Download your eSIM when you're setting up the device.
  • If you’ve already completed setup, select Settings > Network & Internet, then choose the + icon to add a SIM. Select Download your SIM and follow the steps to activate your T-Mobile eSIM.

Other devices

  1. Contact us so we can activate your eSIM.
  2. Connect to Wi-Fi and scan the QR code. Check in Settings > Network & Internet > Mobile Network for most Androids.
  3. Our Tutorials have steps for supported devices, like the Motorola razr 5G.

Get help with your eSIM

Watch our video on installing SIM cards!

Was this helpful?