Installing an eSIM is a simple but important step to ensure your mobile connection works without disruptions during international travel. While some people wait until they reach their travel destinations, others prefer setting it up in advance to prevent potential technical issues. Understanding when to install and activate your eSIM helps you avoid losing data validity or experiencing limited access. In this guide, you’ll learn when it is most appropriate to install your eSIM, how installation differs from activation, and what to consider when using a global eSIM across multiple countries.

Can I install eSIM before travel?

Yes, you can install your eSIM before your international trip. Most global eSIM providers allow installation before your travel begins, even if the plan is set to activate only upon arrival. This approach can help you confirm that your device is compatible and that the eSIM has been correctly added to your phone. Here are some reasons why early installation is recommended:

• Reduce Activation Errors: Installing while connected to a reliable internet connection lowers the chance of failed downloads or setup problems.

• Check Device Compatibility: You can confirm that your phone detects the eSIM and that mobile data settings are configured correctly.

• Avoid Last-Minute Setup: You won’t need to install the eSIM during layovers or at airports, where internet access may be slow or limited.

• Prevent Access Issues: Some countries limit access to certain eSIM apps or websites, so installing the eSIM before departure can help avoid connection problems.

For more information, you can also check out our posts on What is PDP Authentication Failure, eSIM Compatible Phones, and What is a Layover Flight.

When exactly should I install my eSIM?

The recommended time to install your eSIM is one or two days before your international travel. Installing it too early may cause some plans to start counting their validity period immediately, while installing it too late can lead to technical issues or poor internet access during travel. To help you choose the right moment, here is a comparison of possible installation times:

Table 1: When to Install Your eSIM: Options and Considerations

Disclaimer: Some eSIM plans may begin their validity period immediately after installation, while others start only upon activation. Always check your eSIM provider’s plan details before installation.

How can I install an eSIM?

To install an eSIM, you usually need to follow instructions provided by your mobile carrier or a travel eSIM provider. Most eSIM services offer mobile apps that guide you through the process. You can typically download these apps from the App Store (for iPhone users) or Google Play Store (for Android users). After downloading the app, you select a data plan and follow the steps to install the eSIM on your device.

Common mistakes to avoid during eSIM installation

Even though eSIM installation is usually quick, some avoidable mistakes can lead to failed setup or connectivity problems. Below are a few things to watch out for:

• Incomplete Setup Instructions: Not following all the instructions from your provider can lead to failed installation or connection problems.

• Wrong Data Line Selection: If your phone doesn’t switch to the eSIM for mobile data, you may remain offline without noticing.

• Locked Carrier Devices: Even if your phone supports eSIM, it must be carrier-unlocked to use plans from other providers.

• Deleted eSIM Profile: Removing the eSIM after installation may block further access, especially if your provider does not support reinstallation.

• Early Installation Without Validity Check: Installing the eSIM before understanding when the plan starts may cause the data to expire before your trip begins.

Note: Some eSIM services do not allow reinstalling a deleted profile without contacting support. If you’re traveling, restoring access may take longer.

For more information, you can also check out our posts on What Happens If I Delete an eSIM and Can I use an eSIM on a Locked Phone.

When you should Install your Roamless eSIM

You should ideally install your Roamless eSIM one or two days before travelling abroad. This gives you time to test compatibility, complete the setup over a reliable internet connection, and avoid potential issues upon arrival. Once installed, the eSIM remains on your device and does not need to be reinstalled when moving between countries.

Activating your Roamless eSIM

After installing your Roamless eSIM, the next step is to activate it so your device can connect to a mobile network and start using data. The activation process may vary slightly depending on your phone model.

For iPhone users:

• Open the Roamless app and select your preferred data plan.

• Tap Activate eSIM.

• Choose your preferred method:

  • Single Click (available on iOS 17.4 and later)

  • QR Code

  • Manual Entry

• Follow the instructions provided by the app.

• After installation, go to Settings > Cellular, select the Roamless eSIM line, and enable Data Roaming.

For Android users:

• Open the Roamless app and choose a data plan.

• Tap Activate eSIM and select Manual Setup.

• Go to Settings > Connections > SIM card manager > Add mobile plan.

• Enter the activation details manually as shown in the app.

• Once added, set the Roamless eSIM as the preferred data line and enable Data Roaming.

You can download the Roamless iOS app from the App Store to set up and use eSIM on your iPhone. Roamless Android app is also available on Google Play, allowing Android users to set up and manage eSIM for travel.

Note: Roamless supports manual activation on all Android models and offers three activation methods on iPhone (Single Click, QR Code, and Manual), depending on iOS version.

For more information, you can check out our guides on How to activate eSIM on iPhone and How to activate eSIM on Android.

Frequently Asked Questions

Should I install the eSIM before leaving my home country?

- Yes, installing it 1–2 days before departure is ideal. It ensures compatibility and avoids setup issues while abroad.

Can I keep an eSIM installed for weeks without using it?

- Yes, as long as the plan has not been activated or the validity has not started, the eSIM can remain dormant.

Does installing an eSIM too early waste my data plan?

- It depends. Some plans start upon installation, others at activation. Always check the provider's terms.

Does an eSIM plan start when I install it or when I activate it?

- It depends on the provider. Some start at installation, others only after the first connection or manual activation.

Do I need to change settings after installing an eSIM?

- Yes. Installing an eSIM does not automatically enable it for use. You must assign the eSIM profile to a line and enable data in your device’s mobile settings. On iPhones, go to Settings > Cellular [1]; on Pixel devices, use Settings > Network & Internet > SIMs and select “Download a new eSIM” [2].

Sources

[1] Apple Support. ''About eSIM on iPhone'', March 31, 2025 - https://support.apple.com/en-us/118669

[2] Pixel Phone Help. ''Set up an eSIM'', Accessed July 2025. - https://support.google.com/pixelphone/answer/14853135