The old routine of landing somewhere, hunting an airport kiosk, and handing over your passport to buy a local SIM is over. A travel eSIM is bought before you leave, installed in about two minutes, and works the moment the plane doors open. The two providers below both do this well, but they suit different trips, and the differences are worth understanding before you spend anything.
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Airalo if you want the largest country coverage and the most predictable experience, especially for multi-country trips. AirHub if you want simpler plans at competitive prices for a single destination. Both are data-only, so neither replaces your phone number.
How an eSIM Actually Works
Your phone has a physical SIM slot and, if it is reasonably modern, an embedded SIM that can be programmed by software. You buy a plan online, receive a QR code, scan it, and your phone now has a second line. Your home number stays active on the original SIM for calls and texts, while data routes over the new one.
The practical benefit is that you set it up on your own wifi at home, days before you fly, and simply switch it on when you land. No queue, no passport photocopy, no language barrier at a kiosk, and no tiny plastic tray tool to lose.
The queue you are skipping. Setting up an eSIM before you fly means data works the moment you land.
Airalo
Airalo is the largest name in the category and the coverage reflects that, with plans across more than 200 countries and regions. Plans come in three shapes: local for a single country, regional for a continent or bloc, and global for plans that follow you across many countries on one package.
Where it wins: the regional and global plans. If you are doing Tokyo then Seoul then Taipei, one regional plan covers the trip and you never think about it again. The app is also the most polished in the category, and topping up mid-trip takes seconds.
Where it costs you: for a single country, Airalo is often not the cheapest option. You are partly paying for the breadth of the network and the app.
AirHub
AirHub covers a smaller but still large footprint of over 200 countries with a simpler plan structure and pricing that is frequently keener on single destinations.
Where it wins: straightforward one-country trips. If you are going to Japan for ten days and nowhere else, comparing AirHub against Airalo on that exact route is worth two minutes, because the price gap can be meaningful.
Where it costs you: less depth on multi-country regional plans, and a smaller ecosystem if something goes wrong.
The Things Nobody Warns You About
- Data-only means no phone number. Neither gives you a local number on standard plans. Fine for WhatsApp and maps, not fine if a bank wants to SMS you a code. Keep your home line active for that.
- Install before you fly. You generally need internet to install the eSIM. Doing it at home on wifi is easy. Doing it in an arrivals hall with no data is a problem you created for yourself.
- Turn off data roaming on your home line. This is the mistake that costs real money. People install an eSIM, feel clever, and then their primary SIM quietly roams in the background all week.
- Check your phone is unlocked. A carrier-locked phone may refuse the eSIM, and these are usually non-refundable once installed.
- Buy small, top up later. Estimating your data needs upward is how you overpay. Topping up takes seconds.
Which One Should You Buy?
Multi-country trip, or you want the safest default: Airalo. Single country, and you want the better price: compare both for that route and take the cheaper, which is often AirHub.
If you want the wider context on staying connected and safe on hotel and airport networks, that pairs naturally with a proper pre-trip checklist, because sorting connectivity at home is one of those small things that quietly removes an entire category of travel stress.
Frequently Asked Questions
What is a travel eSIM and how does it work?
An eSIM is a SIM card built into your phone that can be programmed by software instead of swapped physically. You buy a data plan online, scan a QR code, and your phone gains a second line for that country or region. There is nothing to collect, nothing to post, and nothing to lose, which is the entire appeal over a physical local SIM.
Do travel eSIMs give you a phone number?
Usually not. Both Airalo and AirHub sell data-only plans, which means no local number for calls or SMS. In practice this matters less than it sounds, because messaging and calls run over WhatsApp, iMessage and similar. It does matter if you need to receive an SMS verification code, so keep your home line active for that.
Is an eSIM cheaper than roaming?
Almost always, and often dramatically. Carrier roaming day-passes commonly run about $10 to $12 per day, so a two week trip can pass $150. A regional eSIM with a sensible data allowance for the same period is frequently under $40. The exception is if your home plan already includes free international data, in which case use it.
Does my phone support eSIM?
Most phones released from roughly 2019 onward do, including iPhone XS and newer, recent Google Pixel, and most flagship Samsung Galaxy models. Your phone also has to be carrier unlocked. Check both before buying anything, because an eSIM is non-refundable once installed.
Image credit: South Lounge, Terminal 5, Heathrow Airport by Ian S (CC BY-SA 2.0). Cropped and resized from the original.