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Understanding eSIM Technology and How It Works on iPhones

An eSIM is a digital version of a traditional physical SIM card. Instead of inserting a tiny chip into your phone, an eSIM stores your carrier information directly in your device's hardware. Apple began including eSIM capability in the iPhone XS, released in 2018, and has included it in every iPhone model since then. Starting with the iPhone 15 series in 2023, Apple removed the physical SIM card slot entirely from its U.S. models, making eSIM the only option for connecting to cellular networks.

The eSIM technology uses the same network connections as traditional SIM cards. When you move an eSIM between iPhones, you're transferring your carrier account information and settings from one device to another. This process is different from transferring data like photos, contacts, or apps—those items move through iCloud or direct device-to-device transfer. The eSIM specifically controls which carrier provides your phone service and manages your cellular plan.

An eSIM takes up no physical space in your phone because it's stored on a chip built into the device. This allows phones to be thinner and gives users more flexibility. You can have multiple eSIMs on one phone in many cases, though only one can be active for calls and data at a time. Some iPhones support dual eSIM functionality, meaning you can store two separate carrier profiles and switch between them without physically changing anything.

Understanding how eSIM differs from physical SIM cards matters when you're moving between iPhones. With a physical SIM, you simply remove it from one phone and insert it into another. With an eSIM, the process is more digital—you're not moving a physical object but rather transferring the rights to use that carrier connection to your new device. Apple and most carriers have streamlined this process significantly in recent years.

Practical Takeaway: Think of an eSIM like a digital subscription that lives inside your phone rather than a removable card. When you switch iPhones, you need to transfer that subscription to the new device through your carrier's systems or Apple's built-in tools.

Step-by-Step Guide to Moving Your eSIM Using iCloud Transfer

If you're moving from one iPhone to another and both devices are in your possession, the easiest method uses iCloud's built-in transfer feature. This method works when you're setting up a new iPhone and signing in with the same Apple ID you used on your old iPhone. Apple's system can transfer your eSIM during the initial setup process, which happens automatically for many users without any additional steps required.

The process begins when you turn on your new iPhone for the first time. During the setup screens, you'll be asked to sign in with your Apple ID. If you're upgrading from a compatible iPhone model and both devices are near each other, your new phone will recognize your old device. At this point, iOS will offer to transfer your cellular plan along with your other data. You should see a message asking if you want to transfer your mobile service. Select "Transfer from iPhone" when this option appears.

Your new iPhone will communicate with your old iPhone to retrieve the eSIM information. This typically takes a few minutes. Keep both phones powered on and near each other during this process. They don't need to be connected to Wi-Fi or cellular data—they use a direct connection to communicate. Once the transfer completes, your new iPhone will have your carrier information, and you can disconnect from your old device.

After the transfer, your old iPhone's cellular service will stop working with that eSIM, but the device itself remains functional for Wi-Fi purposes. You can still use it to browse the internet, send messages over Wi-Fi, or access apps that don't require cellular data. Your new iPhone will now be the active device for your carrier's service.

This method works best when both phones are available and you can complete setup immediately. However, not all carriers support this transfer method, and some older iPhone models may not have this feature. Checking your carrier's support information before attempting this method prevents frustration if it's not available for your situation.

Practical Takeaway: When setting up a new iPhone with your Apple ID, watch for the option to transfer your mobile service—selecting this option handles your eSIM transfer automatically without additional steps.

Transferring Your eSIM Through Your Carrier's Website or App

Most major carriers now offer the ability to transfer eSIMs through their websites or mobile apps. This method works whether you're transferring between two of your own devices or receiving a device from someone else. Each carrier handles this slightly differently, but the general process involves logging into your account, confirming the device you want to transfer service to, and then completing a verification step.

Major U.S. carriers have different processes: Verizon allows transfers through its My Verizon app or website under the "Manage Devices" section. AT&T customers can transfer eSIMs through the AT&T mobile app or by visiting the AT&T website and selecting the option to transfer service to a new device. T-Mobile provides eSIM transfer options through the T-Mobile app or website. Regional carriers and MVNOs (mobile virtual network operators) that use larger carriers' networks typically follow similar processes through their own platforms.

To use a carrier's method, you'll need to know your account number or be able to log in with your credentials. Have your new iPhone available when you start the process. Most carriers will ask you to confirm which device you're transferring to—you'll typically see a list of compatible devices. Select your new iPhone model and allow the process to complete. Some carriers provide a QR code that you can scan with your new phone to complete the transfer more quickly.

The timeframe for carrier-based transfers varies. Some complete within minutes, while others may take up to 24 hours. Your service may experience a brief interruption during the transfer—usually just a few seconds to a few minutes. During this time, your old phone will lose cellular service, and your new phone will gain it. Keep both devices powered on during the process if possible.

If the transfer doesn't complete successfully through your carrier's app or website, customer service representatives can usually complete it for you over the phone. Have your account information and the IMEI number of your new iPhone ready—you can find your IMEI in Settings > General > About on any iPhone, or by dialing *#06# (though this doesn't work on all devices).

Practical Takeaway: Use your carrier's app or website as your primary method for transferring eSIMs—it's often faster than other options and gives you direct control over the process.

What to Do If You're Receiving a Used or Transferred iPhone

When you receive a secondhand iPhone or one that has been transferred to you from another person, the eSIM situation depends on what the previous owner did. Ideally, the previous owner will have removed their service from the device before giving it to you, which removes the eSIM from the phone. However, this doesn't always happen, and you may need to handle it yourself or work with your carrier to set things up.

Before you can use the iPhone with your own carrier, the previous owner's eSIM needs to be removed. If they've already done this, the phone will show "No Service" or "No SIM" in the status bar. If their eSIM is still on the device, you'll see their carrier name displayed at the top of the screen. Don't panic if this is the case—having their eSIM on the phone doesn't give you access to their service or account. It simply means the phone is configured for their carrier.

To remove a previous owner's eSIM yourself, go to Settings > Cellular > Cellular Plans (or Mobile Data Plans depending on your iOS version). You should see the previous owner's carrier plan listed. Tap it and select "Remove Plan" or "Delete Plan." Your phone will ask you to confirm. After deletion, the phone will no longer have an active eSIM, and you can set up your own carrier service.

If you can't remove the previous owner's eSIM for any reason, contact their carrier directly and explain that you've received the device. Provide the carrier with the phone's IMEI number. They can remove the eSIM from their end. This is important for both legal reasons—ensuring the previous owner isn't charged for service on a phone they no longer own—and practical reasons, as it fully clears the device for your use.