Dual SIM when traveling: save your 2FA SMS and use eSIM for data only

Introduction

When the itinerary includes several countries, the cell phone bill can become a nightmare. The cleanest and safest solution is to separate the functions: the physical SIM continues to receive verification SMS (2FA codes) and the eSIM from ILoveEsim exclusively handles data traffic. With this configuration, voice and SMS roaming is disabled and you only pay for the data plan you choose.

Why keep the physical SIM for the codes?

Banks and many authentication services still send codes via SMS. Swapping the physical SIM for a data eSIM can break that flow and block your access to critical accounts. Keeping your local operator's SIM ensures that messages arrive without interruption, even if the operator does not have data roaming agreements.

Prerequisites

1. A Dual SIM compatible smartphone (nano-SIM + eSIM). Recent iPhone models (XS and later) and most Androids (Pixel, Samsung Galaxy S series, etc.) comply.
2. An active eSIM from ILoveEsim. Purchase the plan before leaving or upon arrival, and receive the QR code to activate it.
3. Wi-Fi access. Required to download the eSIM profile and to activate the initial configuration.
4. The data of your physical operator. Make sure the SIM is inserted and working before starting the process.

Step-by-step configuration

1. Install the ILoveEsim

eSIM

Turn on the mobile and connect to a Wi-Fi network. Open the ILoveEsim app or the email where you received the QR, and follow these steps depending on your operating system:

iPhone (iOS 16+)

1. Go to Settings > Mobile data > Add data plan.
2. Scan the QR code provided to you by ILoveEsim.
3. Assigns a name to the profile, for example “Europe Data”.
4. Select “Mobile Data” as the default line to use data.
5. Confirm and wait for the profile to download (a few seconds).

Android (Pixel, Samsung, etc.)

1. Open Settings > Network and internet > SIM and mobile network > Add eSIM plan.
2. Scan the QR or manually enter the activation code.
3. Name it and check the “Use for data” option.
4. Save the changes and verify that the data icon shows the active eSIM.

2. Prioritize the

data line

On both systems, the line you will use for data must be set to “default”. In this way, the physical SIM will continue to receive SMS and calls, but it will not consume data or generate roaming.

3. Disable data roaming on the physical SIM

This prevents unexpected charges if the operator tries to use data while you are away.

• iPhone: Settings→Mobile data→Select your physical SIM→Disable “Data roaming”.
• Android: Settings→Network and internet→SIM and mobile network→Choose the physical SIM→Deactivate “Data roaming”.

4. Verify that the SMS reach the physical SIM

Send a test message to your number or request a verification code from an online account. If you receive it, the configuration is correct.

5. Test the

data connection

Open the browser and load a page. In the status bar you should see the ILoveEsim profile name. If the speed is reasonable, you're ready to explore.

Quick comparison: iOS vs Android

Appearance	iOS (iPhone)	Android
eSIM settings location	Settings→Mobile data→Add data plan	Settings→Network and internet→SIM and mobile network→Add eSIM plan
Activate data via eSIM	Mobile data→Select eSIM as default	SIM and mobile network→Select eSIM→Check “Use for data”
Disable roaming on physical SIM	Mobile data→Select physical SIM→Deactivate “Data roaming”	SIM and mobile network→Select physical SIM→Deactivate “Data roaming”
Profile name	Free, visible in Settings	Free, visible in Network Settings
Management of multiple eSIM profiles	Supports up to 5, change in Settings	Supports several, change in “Network and internet”

Expert Tricks

Warning: If you disable data roaming on the physical SIM but leave “Roaming calls and SMS” enabled, you may be charged for international calls. Always check that both options (data and voice) are disabled on the SIM that you will not use for data.

• Use “Airplane Mode + Wi-Fi” to load the eSIM. In some destinations, the local operator blocks eSIM activation while the physical SIM is on the network. Put your phone in airplane mode, connect to Wi-Fi, and activate the eSIM before returning to the network.
• Save the eSIM QR in the cloud. This way you can reinstall the profile if you lose your phone or change devices.
• Check data consumption every 24 hours. The ILoveEsim app displays a usage panel; If you notice unexpected spikes, check that there are no apps syncing in the background.

Common Troubleshooting

Below are the most common problems and how to solve them:

1. No data appears after activating the eSIM. Restart the mobile and verify that the eSIM is marked as “Default for data”.
2. 2FA SMS do not arrive. Make sure that the physical SIM is activated on the local network (green signal) and that the number is not registered on a block list of your operator.
3. “No service” is displayed on the eSIM. Switch to a Wi-Fi network and try again; Sometimes the eSIM needs a minimum signal to register.
4. Data plan runs out fast. Check the APN settings on the eSIM (Settings→Mobile data→APN). An incorrect APN forces the connection through the physical SIM, generating roaming charges.

Advantages of the Dual SIM strategy with ILoveEsim

Separating communication channels simplifies expense management and protects your bank account. Additionally, the ILoveEsim eSIM offers:

• Flexible plans at competitive prices for more than 100 countries.
• Instant activation via QR or activation code.
• Possibility to change plans without having to visit a store.
• Multilingual technical support available 24/7.

Quick checklist before taking off

• Check that your mobile supports Dual SIM (nano-SIM + eSIM).
• Purchase and download the ILoveEsim data plan.
• Set the eSIM to “Data” and the physical SIM to “SMS/Voice”.
• Disable data roaming (and voice, if you don't need it).
• Perform a 2FA SMS and browsing test.

Frequently Asked Questions (FAQ)

Can I use the eSIM for calls and SMS?

Yes, but in the configuration we propose the eSIM only manages data. If you also want to use it for calls, you will have to activate the “Roaming calls” option and accept the associated charges.

What happens if I lose the physical SIM during the trip?

Contact your operator immediately to block it. Meanwhile, the eSIM will continue to provide data, but you will not receive 2FA SMS. Some apps allow you to receive codes by email or through authenticators (Google Authenticator, Authy) as an alternative.

Can I change ILoveEsim data plans mid-trip?

Exactly. From the app or web portal you can buy a new package and activate it with a new QR without having to remove the physical SIM.

Does the eSIM consume extra battery?

Consumption is marginal. What really takes a toll on your battery is network searches and background syncing processes. Disable automatic app updating and reduce brightness to maximize battery life.

Is it necessary to restart the mobile after each configuration change?

In most cases, a simple change in settings is sufficient. However, if you notice that the eSIM is not registering or SMS is slow to arrive, a quick reset will usually solve the problem.

With these steps and precautions, you can travel with the peace of mind that your security codes arrive on time and your data is kept under control, without surprises on the bill when you return home.