Vostra

Dual SIM: how to use eSIM and SIM card at the same time?

The eSIM is a game-changer for connected travelers. No more fumbling with traditional SIM cards upon arrival at your destination: everything is done remotely, directly from your smartphone. Discover the real differences between physical SIM cards and eSIMs, and how to use both technologies simultaneously while you travel […]

Équipe de rédaction

03 avr. 2026
3 min read

Vostra explique l'utilisation simultanée d'une eSIM et d'une carte SIM physique pour les voyageurs. Restez connecté sans effort avec votre smartphone double SIM partout dans le monde. Idéal pour gérer vos données et appels.

The eSIM is a game-changer for connected travelers. No more juggling traditional SIM cards upon arrival at your destination: everything is done remotely, directly from your smartphone. Discover the real differences between physical SIM cards and eSIMs, and how to use both technologies simultaneously when traveling abroad.

Differences between physical SIM card and eSIM

Understand the differences between SIM card and eSIM

Unlike traditional SIM cards, eSIMs are digital SIM cards directly integrated into the device. This allows for faster and more secure setup.

You can install an eSIM without going through a point of sale or waiting for postal delivery. Since the eSIM is embedded in the phone, it cannot be removed or stolen.

No physical manipulation means fewer technical problems related to wear and tear or poor contacts. eSIMs are more eco-friendly, and therefore more sustainable, as they avoid plastic production and unnecessary shipping.

Using a SIM card and an eSIM simultaneously: how-to guide

If your smartphone is Dual SIM compatible, you can use both a physical SIM card and an eSIM. This can be practical for separating professional and personal use, or for activating a local line during a trip while keeping your main line active.

1. Label your plans

To avoid confusion, assign a name to each line (e.g., “SIM France” and “eSIM Thailand”).

On iOS:

Open Settings > Cellular.
Tap on your eSIM, enter a custom name, then save.

On Android:

Go to Settings > Network & internet > SIM cards.
Select your eSIM and name it.

2. Activate your eSIM

On iOS:

Open Settings > Cellular.
Select your eSIM.
Activate Turn On This Line and Data Roaming.
Choose a supported network if necessary.

On Android:

Go to Settings > Network & internet > Mobile network.
Activate the eSIM, Mobile data, and Roaming.

3. Set your default lines

Voice calls:

Choose which card to use for outgoing calls and SMS.

iOS: Settings > Cellular > Default Voice Line.
Android: Settings > Network > SIM card > Calls/SMS.

Mobile data:

Choose the line to use for internet access.

iOS: Settings > Mobile data > select eSIM.
Android: Settings > Mobile network > select eSIM.

Switching from an eSIM to a physical SIM card (or vice versa)

You can temporarily deactivate your eSIM at any time, for example after a trip, and reactivate your usual SIM card for calls and data. This avoids having to reinstall an eSIM profile later.

Deactivate an eSIM

iOS: Settings > Mobile Data > eSIM > deactivate.
Android: Settings > Connections > Mobile network > deactivate eSIM.

Is your phone compatible with eSIMs?

Using an eSIM-compatible phone while traveling

Most recent smartphones (since 2018) are compatible with eSIM technology. However, your device must also be unlocked (not tied to a specific carrier).

To check, consult the official list of compatible models or dial *#06# on your device to see if it displays an EID (eSIM identifier) number.

Dual SIM smartphones also allow you to combine an eSIM and a physical SIM in parallel. This is ideal for travelers who want a local line while keeping their main number active.

FAQ

Can I use my main SIM card for calls while using an eSIM for internet?

Yes, this is entirely possible if your phone supports dual SIM. You can configure your eSIM to handle mobile data (internet), while keeping your physical SIM card for calls and SMS. Simply set the default lines in your phone’s network settings.

How many eSIM profiles can I save on a single phone?

Most modern smartphones allow you to save between 5 and 8 eSIM profiles. However, only one can be active at a time. This allows you to keep multiple international plans and activate them depending on the country you are in.

What happens if I change phones? Will my eSIM still work?

The eSIM is linked to a single device. If you change phones, you will generally need to download a new eSIM profile via your carrier or a platform like Vostra. This is quick, but it requires a new activation.

How do I prioritize one line for calls, and another for internet?

In your phone’s settings, you can choose which line to use for mobile data, for voice calls, and for SMS. These options are found in the « Mobile network » or « Cellular data » section. You can change these settings at any time.

How do I delete an eSIM that I no longer use?

You can delete an eSIM profile in your phone’s settings, in the « Mobile Data » or « Mobile Network » section. Please note that deletion is permanent: if you wish to use it again, you will need to request a new QR code or reactivation via your provider.