How to use a data-only SIM with VOIP for phone calls in 2025

In 2025, eSIM technology is transforming the way people connect. More travelers and remote workers are turning to data-only eSIM plans because they provide reliable internet access without expensive roaming charges. These plans don’t include a traditional phone number, but with the help of VoIP (Voice over Internet Protocol) and calling apps, you can still make phone calls and send messages.

This guide explains how a data-only SIM with VoIP works, how to set it up, the costs involved, and the best ways to maximize your experience while staying connected worldwide.

A data-only eSIM is a digital SIM profile installed on your phone or tablet. It provides internet access without assigning a traditional phone line. Instead of relying on old-fashioned voice networks, it uses mobile data to keep you connected through messaging and calling apps.

When you activate this type of plan, your device connects to a mobile network using the digital details provided by your eSIM carrier. You can browse, stream, send emails, and communicate online. To make calls, you’ll need an app that supports internet-based calling, which works through VoIP (Voice over Internet Protocol).

Choosing this solution offers several advantages:

So, can you make phone calls with eSIMs that only provide data? The answer is yes, but the process is different from using a regular SIM card.

You’ll need to use apps that work over the internet. Once your eSIM plan is active and your device is connected, you can call landlines and mobiles through VoIP providers or free calling apps.

Services such as Skype, WhatsApp, Viber, and Google Voice are designed to handle calls over data networks. Many of them also give you the option to buy a virtual number, so you can receive calls as well as make them.

Most social platforms now integrate voice and video calling. Whether you use Messenger, Telegram, or Instagram, all you need is an internet connection to reach your contacts instantly.

Some devices support Wi-Fi calling, which allows you to make regular calls through your internet connection. This feature can complement your eSIM data plan, especially in areas with strong Wi-Fi but weak mobile signal.

If you keep your main SIM card in the phone, you can continue to receive calls on your usual number while relying on the eSIM for data. This setup is ideal when you want to stay reachable on your original line but avoid high roaming costs.

A data-only eSIM by itself doesn’t include a phone number for calls or texts. However, you can still use your existing number by keeping your primary SIM in the device, or by subscribing to a VoIP service that assigns you a dedicated number.

This allows you to continue receiving texts and calls while the eSIM handles data usage.

To avoid surprise bills, disable roaming. All your internet access will then be handled by the data-only eSIM.

Most smartphones let you set one SIM for calls and another for data. Keep your primary SIM as the default for calls and your eSIM for internet.

Costs depend on the app or VoIP service you use. Calls within the same app are usually free, while international calls often come at much lower rates than mobile operators charge.

Since these plans don’t support classic SMS, you’ll use messaging apps instead. Some services offer virtual numbers for receiving texts, usually for a small monthly fee.

In most cases, emergency calls rely on the traditional voice network. A data-only eSIM doesn’t guarantee direct access to emergency numbers.

Most smartphones allow emergency dialing without any SIM. They connect to the nearest available network. Alternatively, keep your primary SIM inserted to ensure you can always reach emergency services.

Not every phone supports eSIM. Confirm that your device is compatible before buying a plan. If you’re not sure, read our full guide on how to check eSIM capability on Android to verify your device step by step.

Look for a provider that matches your travel destination, data needs, and budget. Check the coverage and network partners.

Usually, you’ll get a QR code to scan. Once installed, your plan activates in minutes. For a complete tutorial, check our article on how to activate and set up an eSIM, which covers everything from installation to managing your plan abroad.

With the eSIM ready, you’ll have fast internet access to make calls, use apps, and stay connected anywhere you go.

Go to Settings > Cellular > Data Usage. You can also enable usage alerts to stay in control.

Check under Settings > Network & Internet > Data Usage. Many phones let you set a monthly data cap.

Using a data-only eSIM with VoIP apps gives you freedom, flexibility, and cost savings. Whether you’re traveling or just need a second connection, this solution lets you stay in touch while keeping control of your budget.

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