How to Add an eSIM to Your iPhone, Step by Step

Setting up an eSIM on your iPhone sounds technical, but in practice it takes only a few minutes. There is no tiny card to insert and no tray to open. Instead, your mobile plan is downloaded to a chip already built into your phone, and you activate it with a QR code, an app, or a few taps in Settings.

Whether you are switching carriers, adding a second line, or setting up a brand-new iPhone 18, this step-by-step guide covers every method. It also explains what to prepare before you start, how to label and manage your line afterwards, and what to do if activation gets stuck.

Most iPhone models from the iPhone XS onwards support eSIM, and recent models sold in some regions are eSIM-only. The steps below use iOS 27, but the process is very similar on recent earlier versions.

Quick Answer

To add an eSIM to your iPhone, connect to Wi-Fi, go to Settings, tap Mobile Service, then tap Add eSIM. Scan the QR code from your carrier, or follow their app or transfer prompt, then follow the on-screen steps to label the line and choose your default for calls and data. The whole process usually takes under five minutes.

What Is an eSIM and What Do You Need?

An eSIM is a digital SIM embedded in your iPhone. Instead of a physical card, your carrier gives you a digital profile that stores your number and plan details. You can store several eSIM profiles on one iPhone and switch between them in Settings, which makes eSIM ideal for travel and for keeping work and personal numbers separate.

Before you begin, make sure you have the following ready:

• An eSIM-compatible iPhone, meaning an iPhone XS or newer for most regions
• A carrier plan that supports eSIM activation
• A stable Wi-Fi connection for the download and activation
• Your carrier’s QR code, their official app, or their activation details
• Your iPhone updated to the latest version of iOS and charged above 50 percent

If you are transferring a number from an old iPhone, keep both phones nearby, charged, signed in to the same Apple Account, and connected to Wi-Fi. Apple describes the requirements in its overview of using eSIM on iPhone.

Method 1: Add an eSIM Using a QR Code

The QR code method is the most common way carriers issue eSIMs. You will usually find the code in a welcome email, in your carrier account online, or printed in a starter pack.

1. Connect your iPhone to Wi-Fi and open Settings.
2. Tap Mobile Service, which may appear as Cellular in some regions.
3. Tap Add eSIM. On some versions this is labelled Set Up Mobile Service or Add Mobile Plan.
4. Point your iPhone camera at the QR code your carrier gave you.
5. Tap Continue when your plan appears on screen, and wait while it activates. This can take a couple of minutes.
6. When prompted, give your new line a label such as Personal, Work, or Travel.
7. Choose which line to use as your default for calls, messages, and mobile data.
8. Tap Done, then look for signal bars and your carrier name at the top of the screen.

Do not close Settings while activation is running. If the screen seems stuck for more than five minutes, check your Wi-Fi connection first, because a weak connection is the most common cause of delays.

Method 2: Transfer an eSIM From Your Old iPhone

If you are moving to a new iPhone, iOS can transfer your eSIM directly from your old phone. This is called eSIM Quick Transfer, and it avoids QR codes completely.

1. On your new iPhone, go to Settings, tap Mobile Service, then Add eSIM.
2. Tap Transfer From Nearby iPhone.
3. Unlock your old iPhone and keep it close to the new one.
4. Confirm the transfer on the old iPhone when the prompt appears, and enter the verification code if asked.
5. Wait for activation to finish on the new iPhone, then check that you can make a call.

Some carriers also offer transfer during the first setup of a new iPhone. If you see your number listed while setting up the phone, simply select it and follow the prompts. Note that once a number transfers, the eSIM on the old phone usually stops working, which is normal.

Method 3: Add an eSIM Through Your Carrier’s App

Many carriers now let you buy and activate an eSIM inside their own app or website. This is popular for travel eSIMs, where you install the profile before your trip and switch it on when you land.

1. Download your carrier’s official app from the App Store.
2. Sign in and choose the option to buy or add a new eSIM line.
3. Follow the in-app steps. The app will hand you over to iOS to confirm the installation.
4. Tap Allow or Continue when iOS asks to add the mobile plan.
5. Label the line, choose your default settings, and confirm signal once activation completes.

If the app gives you manual details instead, go to Settings, Mobile Service, Add eSIM, then tap Enter Details Manually and type the SM-DP+ address and activation code exactly as provided.

Choosing Labels and Default Lines

After adding an eSIM, iOS asks you to organise your lines. This step matters more than people expect, especially if you now have two numbers on one phone.

Pick a clear label

Choose a label that tells you instantly what the line is for, such as Home, Work, or the country name for a travel eSIM. You can change labels later in Settings under Mobile Service by tapping the line.

Set your default line

Your default line is used for calls and messages to people not in your contacts. You can also choose a separate line just for mobile data. If you want a deeper walkthrough of managing two numbers day to day, our guide on how to use Dual SIM on iPhone for work and personal numbers explains the best setup in detail.

Check data roaming for travel eSIMs

Travel eSIMs often need Data Roaming switched on for the eSIM line, even though they are not really roaming. Check the instructions from your provider, and keep roaming off on your home line to avoid surprise charges.

How to Check Your eSIM Was Added Correctly

Once activation finishes, run through this quick checklist before you rely on the new line:

1. Look for signal bars and the carrier name in the status bar or Control Centre.
2. Open Settings and tap Mobile Service to confirm the new line is listed and turned on.
3. Make a short test call or ask someone to call you.
4. Turn off Wi-Fi briefly and load a web page to test mobile data.
5. Send a text message to confirm messaging works.

If calls work but data does not, the line may need the correct data settings from your carrier, or mobile data may still be set to your other line.

Common Mistakes and Troubleshooting Tips

• Scanning a used QR code: Most QR codes work only once. If yours fails, ask the carrier for a fresh code instead of trying repeatedly.
• Weak Wi-Fi during setup: Activation needs a solid connection. Move closer to your router before you start.
• Deleting the eSIM by accident: A deleted eSIM usually cannot be restored from the phone. Contact your carrier for a new profile.
• Forgetting which line is which: Vague labels cause wrong-number calls. Rename lines clearly right after setup.
• Assuming every carrier supports transfer: Some carriers block Quick Transfer and require a new QR code. Check before wiping your old phone.

If activation fails with a message saying the eSIM cannot be added, restart your iPhone, update iOS, and try once more. Persistent failures almost always need the carrier to reissue the profile from their side. Apple’s support pages also cover the standard steps to set up an eSIM on iPhone if you want to compare the process.

Conclusion

Adding an eSIM to your iPhone is a simple, guided process: connect to Wi-Fi, open Mobile Service in Settings, and add the plan by QR code, transfer, or your carrier’s app. Label your line clearly, choose sensible defaults, and test calls and data before you travel or hand your old phone in. Once you have done it once, switching plans or adding a travel line in the future takes just a couple of minutes.

Frequently Asked Questions

Can I add more than one eSIM to my iPhone?

Yes. Most recent iPhone models can store eight or more eSIM profiles, and two can be active at the same time on Dual SIM models. Extra profiles stay saved in Settings until you turn them on or delete them.

Do I need Wi-Fi to add an eSIM?

In most cases, yes. Your iPhone needs an internet connection to download and activate the eSIM profile, and Wi-Fi is the most reliable option. A few carriers support activation over mobile data, but Wi-Fi is strongly recommended.

Will adding an eSIM delete my physical SIM line?

No. On models with a SIM tray, your physical SIM and eSIM can work together as Dual SIM. Adding an eSIM does not change or remove your existing physical line unless you transfer that same number across.

How long does eSIM activation take?

Usually between one and five minutes. Occasionally a carrier needs longer to provision a new line, especially for a brand-new number. If activation has not finished after fifteen minutes, contact your carrier.

Can I convert my physical SIM to an eSIM?

Many carriers support this. Go to Settings, tap Mobile Service, and look for Convert to eSIM. If the option is not there, your carrier does not support it yet, and you will need to request an eSIM from them directly.