How to Set Up an eSIM: The Complete 2026 Guide for Travelers

Setting up an eSIM takes less than five minutes and eliminates the need to swap physical SIM cards or visit a local carrier store upon arrival. The process involves scanning a QR code delivered by email to add a new cellular profile to your device. For most travelers, the entire setup—purchase, installation, and activation—can be completed from your hotel lobby or home Wi-Fi before you even board your flight.

Pre-Flight Checks: Is Your Phone Ready?

Before you purchase a plan, you must verify two hardware and software conditions. First, your device must have eSIM hardware. This feature is standard on iPhone XS and newer, Samsung Galaxy S20 and newer, and most flagship phones released after 2020. Second, your phone must be carrier-unlocked. If your device is tied to a specific carrier, the eSIM installation will fail with a generic error message. You can check your unlock status by inserting a SIM card from a different provider; if it works, your phone is unlocked. You can also verify your specific device model compatibility on our device compatibility page to ensure your hardware supports the dual-SIM functionality required for travel.

It is also critical to confirm that your primary SIM card is functioning correctly. Since an eSIM is data-only, your physical SIM will remain active for voice calls and SMS. If you plan to keep your home number active for receiving two-factor authentication codes, ensure your carrier allows dual-SIM usage. Most major carriers do, but some budget MVNOs have restrictions. Testing this at home prevents the panic of losing access to your bank or email accounts while abroad.

Step-by-Step: Installing the eSIM on iPhone

Apple’s interface is the most straightforward for eSIM management. The process relies on the built-in camera to decode the QR code sent to your email. Follow these exact steps to avoid common input errors:

1. Navigate to Settings > Cellular (or Mobile Data).
2. Tap Add eSIM. If you do not see this option, your phone is likely locked or an older model.
3. Select Use QR Code. The camera will open. Point it at the QR code from your email. Do not try to type the activation code manually unless the scan fails; manual entry is prone to typos.
4. Once the code is scanned, a prompt will appear asking you to name the plan. Label it clearly, such as "Travel Data" or "CometSIM," to distinguish it from your primary line.
5. Choose Set as Primary Line only if you want the eSIM to handle your default data. Most travelers should select Set as Secondary Line to keep their home number as the primary for calls.
6. Complete the setup. The eSIM is now installed but inactive until it connects to a network.

After installation, you will see two lines under Cellular Settings. The eSIM line will initially show "Not Active" or "No Service." This is normal. It will only activate when you turn on Data Roaming and connect to a local network in your destination country.

Step-by-Step: Installing the eSIM on Android

Android’s interface varies slightly by manufacturer (Samsung, Pixel, OnePlus), but the core path remains consistent. The key difference from iPhone is that Android often requires you to confirm the network selection manually if auto-detection fails.

1. Go to Settings > Network & Internet > Mobile Network.
2. Tap SIMs or Mobile Networks depending on your version of Android.
3. Select Add eSIM. You may be asked to scan a QR code or enter an activation code manually.
4. Scan the QR code from your email. Ensure the camera has sufficient lighting; low light often causes scan failures.
5. Name the profile. Use a distinct name like "Overseas Data" to avoid confusion with your home carrier.
6. Set the eSIM as your Secondary line. This ensures your primary SIM remains the default for voice and SMS.

On some Android devices, you may need to restart the phone after adding the eSIM for the new profile to appear in the network list. If the eSIM does not appear, check your phone’s storage; a full device can prevent new profiles from being written to the secure element.

Data Requirements: How Much Do You Actually Need?

One of the biggest mistakes travelers make is guessing their data needs without a baseline. Data consumption varies wildly depending on whether you are using offline maps or streaming video. The table below provides realistic estimates for a typical tourist using a mix of navigation, social media, and messaging.

For a 7-day trip with moderate usage (maps, social media, some video calls), a 5GB to 10GB plan is usually sufficient. If you plan to stream video or use your phone as a hotspot for a laptop, you will need 20GB or more. Always check the specific data limits of your plan to avoid overage charges or data throttling.

Activating Connectivity: The Data Roaming Switch

The most common reason an eSIM fails to connect is that Data Roaming is disabled. Even though the eSIM is installed, the phone will not attempt to register on a foreign network unless this specific toggle is activated. On iPhone, go to Settings > Cellular > select your eSIM line > toggle Data Roaming to ON. On Android, go to Settings > Network & Internet > Mobile Network > Roaming > toggle Data Roaming to ON for the eSIM.

It is crucial to enable this setting only for the eSIM line, not your primary line. If you turn on Data Roaming for your physical SIM, your home carrier may charge you expensive international roaming fees. The eSIM is designed to use local networks at a flat rate, so it must be the only line with roaming enabled. Once enabled, the phone will search for available networks. If it does not connect automatically, you can manually select the local network provider listed in your plan details.

Stretching Your Data: Practical Tips to Last Longer

Data anxiety is common, but a few simple habits can significantly extend the life of your eSIM plan. First, download offline maps and playlists before you leave your hotel or home. Google Maps allows you to download specific city regions, which uses no data once cached. Second, adjust your app settings. In Instagram and Facebook, limit video quality to "Standard" or "Low" to reduce bandwidth. In WhatsApp, disable automatic downloading of media in chats.

Third, be mindful of background refresh. On iPhone, go to Settings > General > Background App Refresh and turn it off for apps you do not need to update in real-time. On Android, use the "Data Saver" mode in Settings, which restricts background data usage for all apps. Finally, avoid using your phone as a hotspot for a laptop if possible. Laptops consume data at a much faster rate than phones, often draining a 10GB plan in a single day of browsing and video calls.

Troubleshooting Common Setup Errors

If your eSIM is not working, the issue is almost always one of three things: the phone is locked, Data Roaming is off, or the QR code was scanned incorrectly. If you see "Unable to Add eSIM," check your carrier lock status immediately. If the eSIM is installed but shows "No Service," toggle Data Roaming off and on again, then restart the phone. If the QR code scan fails, try using a different light source or enter the activation code manually if your phone allows it. For detailed troubleshooting steps and network-specific tips, visit our eSIM setup guide for destination-specific instructions.

Remember, an eSIM is a data-only service. It will not handle voice calls or SMS. If you need to make calls, use Wi-Fi calling or a VoIP app like WhatsApp or Skype. If you are still experiencing issues after following these steps, contact your eSIM provider’s support team. They can verify that the profile was activated on their end and provide the correct APN settings if manual configuration is required.

Frequently asked questions

Can I use my eSIM and physical SIM at the same time?
Yes, most modern phones support dual-SIM functionality. You can use your physical SIM for calls and SMS while using the eSIM for data. Ensure your phone is unlocked and supports dual-SIM.

Do I need to turn on Data Roaming for my eSIM?
Yes. You must enable Data Roaming for the eSIM line, or it will not connect to local networks. Do not turn on Data Roaming for your primary physical SIM to avoid high roaming charges.

How long does it take to set up an eSIM?
The installation process takes about 2-5 minutes. You need to purchase the plan, receive the QR code via email, and scan it on your phone. Activation happens automatically once you turn on Data Roaming and connect to a network.

Can I use my eSIM for calls and texts?
No, travel eSIMs are data-only. You will need to use your physical SIM for calls and SMS, or use Wi-Fi calling and VoIP apps for voice communication.

What if my phone is not eSIM compatible?
If your phone does not support eSIM, you cannot use this service. You will need to use a physical SIM card instead. Check your phone’s model and carrier lock status before purchasing.