In short: To make cheap calls from abroad, the most cost-effective option is to forget about traditional voice roaming and make calls over the internet (WhatsApp, Telegram, FaceTime) using data from an eSIM that you activate before you leave. You land with a connection, talk for free over data, and only pay for conventional voice calls for specific cases.
That's the summary, but there are nuances that make the difference between a peaceful bill and a nasty surprise upon return. In this guide, we'll see, without beating around the bush, how to make cheap calls from abroad for real: what options exist, how much each one costs, when each method is convenient, and the mistakes almost everyone makes. The idea is simple: land with internet, without roaming, without stress.
Why calling from abroad is so expensive (if you don't prepare)
When you cross a border, your mobile phone leaves its usual network and goes into "roaming," which is the technical term for it. Within the European Union, "roam like at home" exists: you can make calls, send messages, and browse at the same rates as in Spain, with some fair use limits. The problem arises outside the EU.
In destinations like the United States, the UK after Brexit, Turkey, Morocco, or almost all of Asia and America, voice roaming is no longer free and can skyrocket. Every minute of an outgoing call, every minute of an incoming call (yes, in many countries you also pay to receive calls), and every SMS can add up to surprising amounts. If you want to understand how the mechanism works, we explain it in detail in what is data roaming.
The classic trap is doing nothing: you get off the plane, your mobile automatically connects to the first available network, and it starts charging you roaming rates without you even knowing. That's why the first rule for cheap calls is to make an active decision before traveling, not to improvise at the destination airport.
The real options for calling from abroad
There isn't a single correct way to call from abroad. There are several, and the cheapest one depends on who you're calling and why. These are the four main ways:
1. Internet calls (VoIP): the cheapest option
Apps like WhatsApp, Telegram, FaceTime, Signal, Zoom, or Google Meet don't use the traditional voice network; they use data. If you have internet, voice or video calls don't cost you minutes or roaming fees; they only consume data. And a voice call via WhatsApp uses very little data (on the order of a few MB per hour), so with a moderate data plan, you can talk as much as you want. It is, by far, the most economical way to talk to family, friends, or co-workers. You have a specific guide in how to use WhatsApp for free abroad.
2. Data eSIM + voice apps: the combo we recommend
Here's the real trick to cheap calls. You buy a data eSIM for your destination, activate it upon landing, and use that data to call over the internet. You don't pay voice roaming because, technically, you're not making conventional voice calls; you're browsing. This is the formula used by most frequent travelers and digital nomads. If you have doubts about how it compares to classic roaming, we break it down in eSIM vs. roaming.
3. eSIM with calls and included number
For those who need to make or receive traditional voice calls (e.g., confirming a reservation by phone, calling a local taxi, or a number not on any app), there are eSIM plans that include minutes or a local number. Not all eSIMs offer this, so it's a good idea to check the plan details. It's advisable to check the details to know if a plan is data-only or includes voice before purchasing it.
4. Roaming from your Spanish operator
This is the most convenient option (you don't change anything) but almost always the most expensive outside the EU. Some operators offer daily roaming bonuses for certain destinations, and these can make sense for very short trips if you don't want to complicate things. Before relying on it, check with your operator how much voice roaming would actually cost you in that specific country.
Comparison: how much it costs to call depending on the method
Exact prices vary depending on your operator, your destination, and the date, so here we work with honest qualitative ranges, not invented figures. Always consult the current rate with your operator or in the plan's details before traveling.
| Method | Cost of calling | Ideal for | Requires |
|---|---|---|---|
| WhatsApp / FaceTime call (data) | Only consumes data (very low for voice) | Family, friends, work | Internet and that the other person has the app |
| Data eSIM + voice app | The price of the data plan, no extra voice charges | Most travelers | eSIM compatible mobile |
| eSIM with calls / local number included | Included in the plan (check the details) | Calling local numbers without an app | Specific plan with voice |
| Operator voice roaming (outside the EU) | Can exceed several €/minute | Very short trips, specific cases | Nothing, but watch the bill |
| Local SIM bought at destination | Local rate (cheap) + management time | Long stays in a single country | Buy and register at destination |
The conclusion is obvious: for almost everyone, the combination of a data eSIM plus internet calls is the cheapest and most flexible way to talk from abroad. Traditional voice roaming only pays off in very specific situations.
Step-by-step guide to making cheap calls from abroad
This is the routine that works for most travelers. I'll divide it into before and during.
Before you leave (with home WiFi):
- Check that your mobile supports eSIM (most recent iPhone, Samsung, Google Pixel, and other models do).
- Choose a data plan for your destination. For a European trip, the Europe eSIM covers multiple countries with a single plan; for a trip to the USA, the USA eSIM gives you local data from the moment you land.
- Install the eSIM by scanning the QR code you receive by email. You can install it and leave it configured without it starting to consume data. If you get stuck, follow how to install an eSIM step by step.
- Update WhatsApp, Telegram, FaceTime, or the voice app you use, and verify that your important contacts have it.
- Download offline maps and save emergency phone numbers in case you need a real voice call.
Upon landing:
- Exit airplane mode and activate the data eSIM as your data line.
- Activate data roaming only for the destination eSIM and deactivate data for your Spanish line to avoid paying roaming charges by mistake.
- Check that you have internet by opening any website.
- Call via WhatsApp, FaceTime, or your preferred app. You're now talking without paying roaming minutes.
With this configuration, your Spanish card remains silent (not spending) and all your communication goes through the cheap data of the eSIM. If you're worried about running out of GB while talking, don't worry: internet voice uses very little data. The big data devourers are video and streaming, not calls.
How to call Spain (to a landline or a mobile without apps)
Sometimes you need to call a traditional Spanish number: an agency, a doctor, a family member who doesn't use apps. In that case, you have three options. The first and cheapest is for that person to install WhatsApp or Telegram and call through there. The second is to use an eSIM plan that includes minutes or a number. The third, if there's no other option, is an international call by dialing Spain's prefix (+34) before the number.
For international voice calls, it's worth remembering the correct format: the "+" sign (or "00") followed by the country code and then the full number. We have a dedicated guide for this in how to call Spain from abroad, where we go into detail about prefixes and which option is most cost-effective depending on who you're calling.
What almost no one tells you: common myths and mistakes
This is where the real money is lost (or saved). These are the mistakes we see again and again:
- "I put my mobile on airplane mode and it's safe." Partially. Airplane mode cuts everything, including the data you need to call via WhatsApp. The correct thing to do is to leave data active only on the destination eSIM and turn off data for your Spanish line, not turn everything off.
- Forgetting that in many countries you pay to receive calls. Outside the EU, answering a call from your Spanish operator while roaming can cost you as much as making one. If you're expecting important calls, advise them to call you via WhatsApp.
- Relying only on hotel or airport WiFi. It's slow, gets saturated, and isn't always available when you need it most: right after landing. That's why a data eSIM gives you real independence.
- Believing that WhatsApp calls use a lot of data. This is not true: a voice call consumes very little. What skyrockets consumption is a long video call or high-quality video. For talking for hours, voice is very cheap.
- Leaving voicemail active while roaming. With some operators, having voicemail activated while you're abroad counts as a call forwarded abroad and can be billed. If you travel frequently outside the EU, consider deactivating it.
- Activating the eSIM too soon. Many plans start counting validity from the first data usage. Install it at home, but don't activate it until you arrive to take advantage of all the days.
An unobvious but golden piece of advice: before a long trip, do a "fire drill" at home. Install the eSIM, activate data for a moment, and call someone via WhatsApp to confirm that everything works. It's much better to discover a problem from your couch than in a terminal at 2 in the morning.
How to stretch your data to talk throughout the trip
Since calling over the internet depends on your data, managing consumption means managing your ability to talk. A few quick adjustments will significantly extend your plan:
- Deactivate automatic video playback and download on Instagram, TikTok, and similar apps.
- Activate the system's data saver mode (both Android and iPhone have it).
- Reserve hotel WiFi for heavy usage: uploading photos, updates, long video calls, and streaming.
- Prioritize voice calls over video calls when you don't need to see the other person.
With these habits, a moderate data plan will allow you to talk daily without stress. You can find more specific tips in how to save data with your eSIM, which will help you make a single plan cover your entire trip.
Frequently asked questions
What is the cheapest way to call from abroad?
Calling over the internet using data from an eSIM. Applications like WhatsApp, FaceTime, or Telegram don't charge minutes or voice roaming; they only consume data, and voice consumes very little. By purchasing a data eSIM for your destination and talking through an app, you almost completely avoid expensive roaming charges.
Can I call via WhatsApp without spending money abroad?
Yes, as long as you have an internet connection (via eSIM or WiFi). A WhatsApp call does not consume phone minutes or roaming fees, only data, and for voice, it's very low consumption. The other person also needs to have WhatsApp to receive it.
What if I need to call a landline or someone without apps?
You have two options: contract an eSIM plan that includes minutes or a local number, or make an international call by dialing the country prefix (for example, +34 for Spain) before the number. The first option is usually more economical if you will need several calls.
Will I pay roaming if I activate the data eSIM?
Not if you set it up correctly. The data eSIM connects you to a local network through the plan you've purchased, not to your Spanish operator while roaming. The key is to deactivate the data on your Spanish line and only use the eSIM as your data line. This way, your usual card won't incur roaming charges.
How much data does an hour-long internet call consume?
A voice-only call via WhatsApp or similar consumes very little data per hour, on the order of a few MB. Video calls consume significantly more because they transmit images. For long conversations, voice is the lightest and cheapest option; reserve video for when you're on WiFi.
Does this work in any country?
It works wherever there is mobile coverage and your eSIM has a plan. Within the European Union, your own operator also allows you to call as if you were at home thanks to "roam like at home." Outside the EU is where a data eSIM saves you the most compared to traditional voice roaming. Always check the destination's coverage in the plan's details.
Is a data eSIM better or a local SIM bought at the destination?
For most trips, the eSIM wins in convenience: you activate it before leaving and land connected, without searching for stores or registering with your passport. A local SIM might be slightly cheaper for very long stays in a single country, but you lose time and sometimes your number. For trips of days or weeks, a data eSIM is usually the most practical and economical option.
