Can You Use an eSIM for Calls and Texts, or Just Data?

A one-minute WhatsApp voice call uses roughly 0.3 MB of data. That means a single gigabyte gives you over 55 hours of talk time. So when a travel eSIM plan says "data only," it's not the limitation it appears to be — it's the only feature you actually need.

The real question isn't whether you can make calls with a data-only eSIM. It's why you'd pay extra for a voice plan when data does the job better.

Most Travel eSIMs Are Data-Only

When you buy a travel eSIM from providers like Only eSIM, Airalo, or Nomad, you're getting mobile data. 4G or 5G internet access on a local carrier's network. That's it. No phone number. No ability to dial someone the traditional way or send a standard SMS.

This isn't a limitation they forgot to fix. It's by design. Travel eSIM providers buy wholesale data from carriers around the world, and data-only agreements are simpler, cheaper, and available in far more countries. Adding voice and SMS requires number allocation, carrier interconnect agreements, and regulatory compliance in each country — all governed by GSMA specifications that define how eSIM profiles are provisioned. That complexity is why data-only plans cost a fraction of what voice-enabled plans do.

The Practical Workaround Most Travelers Use

Here's the thing: if you have a data connection, you already have calls and texts. Just not the old-fashioned kind. These apps use Voice over IP (VoIP) technology to convert your voice into data packets sent over the internet rather than through a traditional cellular voice circuit.

WhatsApp voice calls use roughly 0.3 to 0.5 MB per minute. That's about 30 MB for an hour-long conversation. Video bumps it up to around 5 MB per minute. FaceTime Audio is similar at about 0.5 to 1 MB per minute, and FaceTime video lands around 3-5 MB per minute. Telegram, Signal, and Facebook Messenger all offer voice and video calling over data too.

For most travelers, this covers everything. You can call home, coordinate with your travel group, and even join work meetings. The calls sound clear on a 4G connection, and you're burning through very little data.

One thing to keep in mind: the person you're calling needs the same app. That's rarely an issue with WhatsApp (over 3 billion monthly active users worldwide), but worth remembering if you're trying to reach a restaurant or a business that only has a landline.

Your Home Number Still Works (If You Set It Up Right)

The standard dual-SIM travel setup looks like this:

1. Keep your home SIM in the phone (physical SIM or existing eSIM)
2. Install your travel eSIM and set it as the preferred line for data
3. Turn off data roaming on your home SIM so it doesn't rack up charges
4. Leave your home SIM active for voice and SMS

With this setup, your regular phone number stays reachable. Incoming calls and texts hit your home SIM. All your internet traffic routes through the travel eSIM's cheap local data.

Wi-Fi Calling takes this a step further. If your home carrier supports it (most major carriers in the US, UK, and Europe do), your phone can route calls to your home number over your travel eSIM's data connection. That means you can answer calls to your regular number without paying roaming rates. Check your carrier's Wi-Fi Calling policy before you travel, though. Some carriers restrict it to domestic use only.

When You Actually Need a Voice-Enabled eSIM

For most travelers, data-only plus VoIP apps is the right call. But there are a few scenarios where a voice-enabled eSIM makes sense:

You need a local phone number. Booking restaurants, calling hotels, arranging airport pickups. Some businesses in certain countries won't answer calls from foreign numbers or VoIP apps. Having a local number solves this. A few eSIM providers like Airalo and eSIM.net offer plans with local numbers in select countries.

You need to receive calls from people who won't use apps. If your elderly relatives or your boss will only dial a regular phone number, and your home carrier doesn't support Wi-Fi Calling abroad, a voice plan gives you a reachable number.

You're staying long-term. If you're spending months in a country rather than days, a full voice + data plan starts to make more sense economically and practically.

For a one-to-two week vacation? Data-only is almost always enough.

The Setup That Covers 95% of Travelers

Before your trip:

1. Get a data-only eSIM for your destination
2. Install it but don't activate until you land
3. Download WhatsApp if you don't have it (your contacts abroad probably already use it)
4. Enable Wi-Fi Calling on your home SIM if your carrier supports it
5. Turn off data roaming on your home SIM

That's it. You land, activate the eSIM, and you have fast local data for browsing, maps, and ride-hailing apps. Calls happen over WhatsApp, FaceTime, or Wi-Fi Calling. Your home number stays active for the occasional SMS verification code.

Not as complicated as it sounds. And significantly cheaper than paying roaming rates just to have a "real" phone number abroad.

If you're new to eSIMs entirely, our beginner's guide to eSIM technology walks through the basics of how it all works and which phones support it.

Image credit: Photo by Vitaly Gariev on Unsplash.