eSIMs for data only are a popular choice for travelers due to their flexible internet access without a physical SIM card. But can they be used for making calls? This article will answer that question and guide you on how to use an eSIM for communication while traveling.

What is a data-only eSIM? Can it be used for making calls?

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Simply put, a data-only eSIM is a type of SIM card that only provides mobile data for internet access; it does not include a phone number and does not support regular calls or SMS.

The main difference between a data-only eSIM and a regular eSIM lies in its communication functionality. While a regular eSIM (usually issued by a domestic network provider) has its own phone number and fully supports calling, texting, and internet access, a data-only eSIM is optimized for internet access needs, often used in international travel or short-term needs.

However, you can still communicate normally through the app, as long as you have an internet connection. These are internet-based calling (VoIP) apps like WhatsApp, Viber, Zalo, Skype, etc., which support both audio and video calls. In fact, many people only need a data-only eSIM to stay connected during their travels without needing a physical SIM or primary phone number.

How to make calls using eSIM with data only when traveling.

Below, Aviro will guide you through some common ways to make calls when using a data-only eSIM.

1. Call via OTT messaging app.

Source: Pexels

Popular messaging apps like WhatsApp, Zalo, Facebook Messenger, Telegram, Viber, and LINE all support voice and video calls over the internet. As long as both you and the recipient have the app installed, connecting is easy and completely free, regardless of your location.

Advantage:

• Familiar and easy-to-use interface.

• No local phone number required.

• Supports both video calls and sending files and photos.

Note: Some apps (like WhatsApp) require an initial phone number for verification , so you should activate and log in before switching to a data-only eSIM.

2. Use a VoIP application to call the phone number.

If you need to call a landline or mobile phone number, you can use VoIP (Voice over IP) services such as:

• Skype : Allows you to call any phone number in the world at a low cost. You can purchase call packages by the minute or top up your account.

• Google Voice (available in select countries only): Allows you to make and receive calls using your personal Google number.

• TextNow, Talkatone : Gives you a virtual phone number to make calls, primarily supporting the US and Canada.

Advantage:

• You can make calls to any phone number, even those who don't use the app.

• It's much cheaper than calling via international roaming.

Note: Some services require account setup in a specific country (e.g., Google Voice in the US). You should carefully check the terms of service before using them.

3. Tips for making effective calls when using a data-only eSIM

Besides knowing the applications, you can apply the following tips to make calling and texting with eSIM smoother:

• Prioritize using a stable Wi-Fi connection.

• Use 4G/5G network instead of 3G for better sound quality.

• Turn off bandwidth-intensive apps like YouTube, Netflix, Facebook, TikTok, Spotify, or apps that download data in the background.

• Consider updating your phone's software and calling apps regularly to avoid errors.

• Using headphones with a quality microphone helps to get clear sound and reduce noise.

• Ensure your phone battery has sufficient capacity to maintain stable performance.

Instructions for activating and using a data-only eSIM

Source: Canva

Before buying an eSIM, you need to check if your device supports eSIM .

You can purchase a travel eSIM from service providers like Aviro. After payment, a QR code or activation code will be sent via email within minutes.

Next, Aviro will guide you on using your primary phone number with a data-only eSIM when traveling:

1. Keep the primary SIM card always on (do not remove or turn it off).

Even if you're using an eSIM to access the internet, make sure your physical SIM (or primary eSIM) – the one containing your phone number – is still enabled. If you remove the SIM or disable it in the settings, you will not be able to receive/make calls or SMS messages using that number.

2. Turn off “Data Roaming” for the primary SIM.

Go to Settings > Cellular (or Mobile Network) on your phone and turn off "Data Roaming" for your primary SIM. This will prevent your SIM from automatically using international data and incurring high charges.

In addition, to ensure you're not using a roaming plan, proactively call customer service or check your account to make sure it hasn't been activated by default.

3. Turn on eSIM data only and select it as your primary mobile data source.

To use the internet while abroad and avoid roaming charges , activate your travel eSIM as soon as you arrive and make sure that in Settings > Mobile Data, you have selected eSIM as your default mobile data source. Specifically:

• For iPhone: turn on Data Roaming for eSIM.

• For Android: select eSIM as the primary SIM for mobile data.

4. Configure the primary SIM card for calls and messages.

To ensure you can still receive/send messages or calls using your original phone number, follow these steps:

• On iPhone : Go to Settings > Cellular > Default Line > iMessage & FaceTime, and select your primary SIM.

• On Android : Go to Settings > Cellular > Calls & Messages, select primary SIM.

Note: You must enable data roaming on your primary SIM card in Vietnam before traveling abroad.

5. Notes on international calls and SMS

Even if you use eSIM for data, calls or messages made with your primary SIM abroad will still be charged international rates according to your carrier's tariff. It's best to prioritize calling via apps (like WhatsApp, Zalo, Viber, Messenger, etc.) to save on costs!

Data-only eSIMs are a smart choice for staying connected while traveling internationally, limiting roaming charges, and still allowing you to make calls over the internet using popular apps. With proper setup, you'll have a seamless experience throughout your trip. If you don't yet have a data-only eSIM, contact Aviro immediately via email Sales.VN@avironetwork.com or live chat on the website!

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