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The T-Mobile Prepaid eSIM app lets you activate new T-Mobile prepaid service on an iPhone or Android with eSIM. For other devices, check the compatibility to bring your device to T-Mobile Prepaid

Looking for Prepaid plans and devices? Visit the T-Mobile Prepaid website.

About the app

The Prepaid eSIM app was built for travelers coming to the U.S., existing T-Mobile customers who want a secondary pre-paid line, and anyone who wants to take the Un-carrier out for a test drive to try out America’s fastest 5G network.*

  • The app can only activate a T-Mobile prepaid line.
  • For postpaid accounts, check out T-Mobile eSIM.
  • Only available for iPhone or Android devices with eSIM.
  • The app requires:
    • You have a data connection, through either Wi-Fi or Cellular.
    • You either purchased the device from T-Mobile, or else you must first SIM unlock it. (Contact the original provider if you need help.)
  • There are no fees to activate a device with an eSIM.
  • New activations may be completed outside of the US, but the device must register on the T-Mobile network to begin using the service.
  • To activate your eSIM on another wireless provider or manage eSIM settings, check out our Tutorials.
    T-Mobile Prepaid eSIM app icon.


Activate T-Mobile service

  1. Download the T-Mobile Prepaid eSIM app:
  2. Open the app and enter your email address, then select Let's go. Make sure the email address isn’t already used with a T-Mobile ID.
  3. If prompted, allow the app access to your location while you’re using the app.
  4. Enter the ZIP code for the primary place you'll use T-Mobile service, usually your home, and select Continue.
  5. Choose your prepaid plan, then select Continue. Choose Plan details for more information on the plans.
  6. Review the Service terms, then select Accept if you agree.
  7. Enter your credit card information, with CVC/CCC and billing ZIP, set up a 6-15 digit PIN, then select Review.
  8. Review your order to make sure everything looks correct, then choose Submit & pay.
  9. Wait while we set up your T-Mobile service.
  10. On the "Install Cellular Plan" screen, choose Continue to download and install your eSIM.
  11. Follow the prompts on your device to complete your eSIM download, including giving it a name and choosing a primary line.
  12. If you want to use a phone number from another provider or from another line, contact us to get this started.

Re-download eSIM

Sometimes, you may need to replace the eSIM you received through the app.

  • You accidentally deleted your eSIM.
  • You upgraded your phone and want to transfer your eSIM line of service to your new phone.
  • You lost connection when downloading your eSIM, and it didn't get installed properly on your device.

If you’re switching from one iPhone to another, you can transfer your phone number during Quick Start or through device settings. Otherwise, you'll need to call us at 1-877-778-2106. Make sure you have:

  • Your Prepaid eSIM phone number or your OrderID. Your OrderID will display if you encounter an error in the app.
  • Your account PIN code, which you set up to complete your order in the T-Mobile Prepaid eSIM App.

Errors and support

Here are some error messages you may receive using the app and tips to solve them.


Oops, you lost connection

  • This means the app lost its connection to the internet when trying to set up service.
  • Make sure you have good Wi-Fi or Cellular signal, then try again.
  • If possible, try again using a different Wi-Fi network.

Oops, your receipt isn't ready yet

  • This means that your receipt hasn't finished loading yet. It could take a minute.
  • You can also view the receipt on My T-Mobile under your account history.

Error 501: Device is incompatible or locked by your provider

  • This means your device doesn't have an eSIM or is locked to the service provider you purchased it from.
  • If you have an iPhone, make sure it's the Apple iPhone Xs or newer.
  • Contact the service provider who sold you the device to request an unlock.

Error 502: That email is already a T-Mobile account

  • This means the email address you're trying to use is already set up with an existing T-Mobile account.
  • Try again with a different email address to create a new account.

Error 503: eSIM limit reached on this device

  • This means you've run out of eSIM profile spaces on your device.
  • To activate T-Mobile service, delete an existing eSIM profile. Check Tutorials for steps.

Error 504: Oops, something went wrong

  • This means that the app had an issue loading the next screen.
  • Make sure you have a strong Wi-Fi or Cellular data connection, then try again.
  • If it's still not working, contact us for help.

Error 505: There was an issue completing your order

  • This means that something other than the issues above is causing problems.
  • Make sure you have a strong Wi-Fi or Cellular data connection, then try again.
  • If it's still not working, contact us for additional support.

Error 506: It looks like your ZIP code has no remaining phone numbers

  • This means that we've run out of phone numbers for that ZIP code.
  • Close the app, clear it from the recent apps, and then try again.
  • If it's still not working, contact us for help.

Full terms


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