Do I need Wi‑Fi to set up an eSIM?

Yes. The device needs internet (usually Wi‑Fi) to download the eSIM profile. After that, the eSIM works on the cellular network.

Can I scan the QR code from another phone or a printout?

Yes. As long as the device that will use the eSIM scans the code or opens the link, it can be shown on another phone or on paper.

What if the QR code does not work?

Check that you are scanning with the device that will use the eSIM, that the code has not expired, and that the device supports eSIM. If the provider gave you a link, try that instead.

Can I set up the eSIM after I arrive abroad?

Yes. You can add the profile before or after you travel. Having it installed before you leave often avoids issues with connectivity when you land.

How do I switch between my main SIM and the eSIM?

In your device settings, under Cellular or SIMs, you choose which line is used for data and which for voice. You can switch at any time.

Will I lose my main number if I add an eSIM?

No. Adding an eSIM does not remove or change your existing SIM. You keep your current number and plans.

Do I need to remove the eSIM when I get home?

No. You can leave it installed and simply stop using it, or remove it in settings if you want to free the slot.

Can two devices use the same eSIM?

Usually no. The profile is tied to the device that installed it. Check the provider’s terms for your plan.

What does "primary" and "secondary" line mean?

On dual-SIM devices, the primary line is often your main number (calls and texts); the secondary can be used for data or a second number. You can assign which SIM or eSIM is primary or used for data.

How long does activation take?

Downloading and installing the profile usually takes a minute or less. Activation on the network can be immediate or take a short time depending on the provider.

How to use an eSIM: set up and activate

Setting up an eSIM is done from your phone: you add a cellular plan that was sent to you as a QR code or link. No physical SIM is required. This guide walks you through the general steps so you know what to expect.

Definition

Using an eSIM means adding and activating a cellular plan that is delivered as a digital profile (e.g. via QR code or link). Your device downloads the plan and stores it on the built-in eSIM; you then choose when to use it (e.g. for data when abroad).

How it works

1. Obtain the eSIM from your provider (QR code or activation link).
2. Connect the device to Wi‑Fi so the profile can download.
3. Open your device settings and find the option to add a cellular or data plan (e.g. Cellular > Add Cellular Plan, or Settings > Network > SIMs).
4. Scan the QR code with the device camera or open the link on the same device; follow the prompt to download the profile.
5. Name the plan (e.g. "Travel") and confirm.
6. Set the plan as default for data or for specific use (e.g. when roaming); on some devices you choose which line to use for data and which for voice.
7. When you no longer need the plan, you can remove or disable it in the same settings.

Benefits and limitations

Benefits: One process for all eSIMs; no need to handle a physical card; you can set up before travel. Limitations: You must have a compatible device; a wrong or expired QR code will not work; support depends on the provider.

Comparison with alternatives

Setting up an eSIM is similar to adding a second line with a physical SIM, but you do not insert a card. Compared to roaming, you explicitly add and select a plan instead of automatically using your home operator abroad.

Frequently asked questions

Do I need Wi‑Fi to set up an eSIM?: Yes. The device needs internet (usually Wi‑Fi) to download the eSIM profile. After that, the eSIM works on the cellular network.
Can I scan the QR code from another phone or a printout?: Yes. As long as the device that will use the eSIM scans the code or opens the link, it can be shown on another phone or on paper.
What if the QR code does not work?: Check that you are scanning with the device that will use the eSIM, that the code has not expired, and that the device supports eSIM. If the provider gave you a link, try that instead.
Can I set up the eSIM after I arrive abroad?: Yes. You can add the profile before or after you travel. Having it installed before you leave often avoids issues with connectivity when you land.
How do I switch between my main SIM and the eSIM?: In your device settings, under Cellular or SIMs, you choose which line is used for data and which for voice. You can switch at any time.
Will I lose my main number if I add an eSIM?: No. Adding an eSIM does not remove or change your existing SIM. You keep your current number and plans.
Do I need to remove the eSIM when I get home?: No. You can leave it installed and simply stop using it, or remove it in settings if you want to free the slot.
Can two devices use the same eSIM?: Usually no. The profile is tied to the device that installed it. Check the provider’s terms for your plan.
What does "primary" and "secondary" line mean?: On dual-SIM devices, the primary line is often your main number (calls and texts); the secondary can be used for data or a second number. You can assign which SIM or eSIM is primary or used for data.
How long does activation take?: Downloading and installing the profile usually takes a minute or less. Activation on the network can be immediate or take a short time depending on the provider.

When this solution makes sense

Use this process whenever you have an eSIM plan (travel, second number, or data-only). It does not apply to devices that do not support eSIM.

Last updated: February 8, 2025