I have landed in 34 countries over the past 20 years. In the early days, international roaming meant either paying obscene fees to my carrier or hunting for a local SIM card in a foreign airport at midnight while exhausted and jet-lagged. Both options were miserable. This guide covers the best eSIM for international travel — tested on real trips, paid for with my own money.
eSIMs changed everything. No physical card. No hunting for a mobile shop. No swapping tiny pieces of plastic over an airport bathroom sink hoping you don’t drop one down the drain. You land, you connect, you work.
But not all eSIMs are created equal. After testing six providers across 20+ countries, one clear winner emerged for business travelers. This guide covers the only eSIM worth buying for international travel — tested on real trips, paid for with my own money.
What to Look for in a Travel eSIM
Most travelers buy an eSIM based on price alone. That’s a mistake. Here’s what actually matters for business travel:
Coverage — Does it work in the countries you actually visit? A cheap eSIM with spotty coverage in Germany is useless if you’re presenting to a client in Frankfurt.
Data speeds — Some budget eSIMs throttle speeds after a small data threshold. For business travelers who need to send large files, join video calls, and access cloud platforms, speed matters.
Ease of setup — You should be able to install and activate your eSIM before you board. Dealing with technical issues on arrival is not an option.
Customer support — When something goes wrong at 2am in Tokyo, you need help. 24/7 support is non-negotiable.
Price per GB — Once coverage and speed are confirmed, price matters. The best eSIMs deliver solid value without sacrificing reliability.
The Only eSIM Worth Buying — Airalo
After testing six eSIM providers across trips to the UK, Germany, Japan, Singapore, and Australia, Airalo is the one Rex Boardman uses on every international trip.
Airalo offers eSIM coverage in 200+ countries and regions. The setup takes under five minutes — you purchase through the app, scan a QR code, and your eSIM is installed before you board. On arrival you’re connected before you clear customs.
The data plans are flexible. You can buy a local eSIM for a single country, a regional eSIM covering multiple countries in one plan, or a global eSIM for trips spanning multiple regions. For a business traveler hopping between London, Frankfurt, and Amsterdam in a single week, the Europe regional plan is exceptional value.
Speeds have been consistently strong across every destination tested. In Tokyo I ran video calls over Airalo data without a single dropout. In Singapore I uploaded a 500MB presentation from a hotel lobby with no issues.
What it doesn’t do: Airalo eSIMs are data only — no calls or texts through the eSIM itself. For calls, use WhatsApp, FaceTime, or your carrier’s WiFi calling feature.
Bottom line: The best eSIM for international business travel. Period.
👉 Check price on Airalo
Frequently Asked Questions
What is an eSIM?
An eSIM is a digital SIM card built into your phone. Instead of inserting a physical SIM, you download a carrier profile digitally. Most modern smartphones including iPhone XS and later and most Android flagships support eSIM.
Is Airalo reliable for business travel?
Yes — Rex has used Airalo across 20+ countries over two years without a single activation failure. Coverage and speeds have been consistently strong across Europe, Asia, and Australia.
Can I keep my regular number while using an eSIM?
Yes. Your physical SIM stays in your phone. The eSIM runs alongside it as a secondary data connection. You can still receive calls and texts on your regular number while using the eSIM for data.
The Bottom Line
International roaming fees are a tax on travelers who don’t know better. With Airalo, a week of data in Europe costs less than a single day of carrier roaming charges.
After two years and 20+ countries, Airalo is the only eSIM Rex Boardman travels with. The coverage is reliable, the setup is effortless, and the price is fair. For business travelers who can’t afford to be offline in a foreign country, it’s the single best travel tech purchase you can make.
Stop overpaying for international data. — Rex Boardman ✈️
Disclosure: This article contains affiliate links. If you purchase through our links we may earn a small commission at no extra cost to you. This never influences our recommendations — we only recommend gear Rex has actually used on real trips.