What is an eSim Card & How Does it Work? | AT&T

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What is eSIM?

Learn what eSIM is, how it works, and how to activate it on compatible devices.
If you’ve switched phones, managed more than one line, or traveled to another country on an older device, you’ve likely dealt with a physical SIM card and the manual steps involved in setting it up. Most newer devices have eSIM, which gives you a digital way to connect your device without a removable chip. It makes it easier to set up and manage your service on phones, tablets, and other compatible devices.

Info at a glance

What is an eSIM and how does it work?

eSIM, short for Embedded SIM (Subscriber Identity Module), is a digital version of a SIM card that is built right into your phone. It allows your device to connect to a wireless network without using a physical SIM card.

Instead of placing a SIM into your device, eSIM is downloaded and activated digitally. Your wireless service information is stored securely on the device and can be updated through your phone’s settings. Once activated, your phone connects to the network the same way it would with a physical SIM, so you can call, text, and use data as usual.

To learn more about how eSIM works and how to set it up on your AT&T device, visit Get to Know eSIM.

eSIM cards vs. physical SIM cards

A physical SIM card is a small removable chip that stores the information your phone needs to connect to a wireless network. To switch phones that use SIM cards, you take the card out of one device and place it into another.

An eSIM works differently. Most newer model devices have an eSIM. It is built into the device, so changes to your wireless service are managed digitally. Switching eSIM-compatible devices involves downloading and activating your service over the internet instead of moving a SIM card between phones.

Even though the setup steps are different, both eSIM and SIM cards serve the same main purpose of connecting your device to a network.

What are the benefits of eSIM?

eSIM offers several benefits besides removing the need to swap a physical SIM card.

 

  • Simple setup: eSIM allows you to manage your wireless service online, which makes it easy to set up your device.
  • More security: Because eSIM is built into your device and can’t be removed, it can be turned off remotely if your device is lost or stolen.
  • Quick activation: Many devices that use eSIM don’t require a store visit or a mailed SIM card. You can download and activate eSIM over Wi-Fi, which also makes it easier when you are switching phone carriers.
  • Multiple numbers on one phone: Some devices can hold more than one eSIM profile. This lets you keep work and personal numbers on the same device.
  • Easy use when traveling: eSIM can support service in other countries. AT&T customers can learn more about using your phone internationally, including options like International Day Pass. Visitors to North America can also activate an eSIM by AT&T for the USA, Canada, or Mexico right from your phone—no store visit or physical SIM required.

Are there any disadvantages to virtual SIM cards?

While eSIM has many benefits, there are a few limitations to keep in mind.

 
  • Device and network compatibility: Not all phones, tablets, or laptops work with eSIM. Older model devices may have a physical SIM. Support can vary by device and wireless network.
  • Transfers may need extra steps: Moving your service to a new device with eSIM can sometimes require more steps compared to swapping a physical SIM card.
  • Internet needed for setup: You need an internet connection to download and activate an eSIM. Without Wi-Fi or cellular data, setup may be delayed.

Which phones are eSIM-compatible?

Some phones still rely on a physical SIM card to connect to a network. But eSIM is now common on many newer models, including iPhones released in 2018 or later. Still, not every device supports eSIM, and compatibility can vary by brand and model.

To see which devices work with eSIM on AT&T, browse eSIM compatible phones.

If you aren’t sure whether your phone supports eSIM, contact the device manufacturer directly to confirm.

Which tablets and laptops are eSIM compatible?

Some tablets and laptops support eSIM, allowing them to connect to a cellular network without a physical SIM card. eSIM is more common on tablets than laptops, and support can vary by device and model.

Before you choose eSIM for a tablet or laptop, make sure the device supports eSIM and cellular service. You can check the manufacturer’s specs to determine whether eSIM is supported.

To see which tablets and laptops work with eSIM on AT&T, browse eSIM compatible tablets.

How to download and activate your eSIM card

To use eSIM, you need a device that supports eSIM and an active wireless plan. How you download and activate your eSIM depends on whether you’re setting up a new device, upgrading, or bringing your device to AT&T.

 
  • Activate or download your eSIM: Use the eSIM Activation Guide to download and activate eSIM on a supported device.
  • Bring your own device: If you’re switching from another carrier, you can bring your own device to AT&T and set up eSIM during activation. 

 

For steps based on your device type, see the sections below for iPhone and Android.

Activating an eSIM on iPhone

If you are upgrading to a new iPhone, check out Apple's guide for transferring phones with an eSIM.  

If you are activating an eSIM on an iPhone and not transferring from another iPhone, here are the steps: 

   
  1. Turn on your iPhone or open Settings.
  2. Tap Cellular, then tap Add Cellular Plan.
  3. Scan the QR code provided by AT&T or sign in to your account if prompted.
  4. Follow the on-screen instructions to complete activation.

 

Once activation is complete, your iPhone will connect to the network without a physical SIM card.

Activating an eSIM on Android phones

 

  1. Open Settings on your Android phone.
  2. Tap Network or Connections, then select SIMs or Mobile Network.
  3. Choose the option to add or download a SIM.
  4. Scan the QR code provided by AT&T or enter the activation details.
  5. Follow the prompts to finish setup and connect to the network.

 

Menu names and steps may vary slightly depending on your Android device and manufacturer.

Need more help? You can also visit the AT&T activation site online or call AT&T support at 888.986.4520.

Can you transfer an eSIM from one phone to another?

Yes. If both devices support eSIM, you can transfer your service from one phone to another. In most cases, this involves deactivating eSIM on your old device and activating it on your new one.  

For step by step instructions, see how to transfer your eSIM with AT&T.

Shop eSIM compatible phones and get support at AT&T

AT&T offers a range of phones that support eSIM, so you can get started without a physical SIM card. You can shop eSIM compatible phones to see available options. 

If you need help with setup or activation, visit troubleshooting eSIM issues for step by step guidance. For additional help and answers to common questions about your wireless service or account, you can also explore AT&T wireless support.

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Author

Aaron Harper

Aaron Harper works in digital customer growth at AT&T, focusing on wireless, internet, and digital technology. He has written technology content for large brands and direct-to-consumer startups. He is based in Los Angeles.

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