What is a travel eSIM and how does it work?

An eSIM (embedded SIM) is a digital SIM card built directly into your phone. Instead of swapping out a physical SIM every time you arrive in a new country, you install a travel eSIM before you leave home — and it activates when you land. No airport SIM queues. No fumbling with tiny plastic cards. No losing your home SIM in a guesthouse somewhere in Southeast Asia.

Here's how it works in practice:

1. You buy a travel eSIM online before your trip.
2. It arrives instantly to your email as a QR code.
3. You scan the QR code on your phone (on home WiFi).
4. When you land, you switch your data to the eSIM.
5. You're connected instantly — no setup, no stores, no paperwork.

Your regular number stays active on your home SIM the whole time — you keep WhatsApp, contacts and your number, and just add a data line on top.

Is your phone eSIM compatible?

Most modern smartphones support eSIM:

• Apple: iPhone XS and later (2018 onwards)
• Samsung: Galaxy S20 and later, Z Fold/Flip series, Note 20 and later
• Google: Pixel 3 and later
• Other Android: most flagships from 2020 onwards — check Settings under "SIM & Network," or search your model + "eSIM compatible"

One critical check: your phone must be carrier-unlocked. If you bought it on contract, it may be locked and unable to use third-party eSIMs. Ask your carrier to unlock it before you travel — usually free once your contract is up.

Why we use Holafly for international travel

We've tried the alternatives across nine years on the road. Here's why Holafly is what we actually use.

Truly unlimited data

The big one. Data sold by the gigabyte means constant anxiety — buy a bucket, and when it's gone, it's gone. Holafly sells unlimited plans: you pay for days, not data. For families on a hotspot, creators uploading video, or nomads working remotely, unlimited actually means something.

Coverage in 200+ destinations

Holafly covers 200+ destinations worldwide. For multi-country trips, the regional and Plans options are even better: one eSIM, automatic network switching as you cross borders.

No SIM swapping between countries

The most underrated feature of the regional and Plans options: you change nothing crossing a border. The eSIM detects the new country and connects automatically. France into Italy, Thailand into Vietnam, the US into Canada — seamless every time.

Instant activation

Your QR code arrives by email in minutes. Install at home on WiFi, set up in five minutes, done. No shipping, no airport queues, no foreign-language paperwork.

24/7 customer support

If something goes wrong, Holafly has 24/7 live chat. We've used it once — resolved in under 10 minutes.

Holafly Plans explained: which one is right for you?

Holafly offers two main types of plan depending on your travel style.

Traditional destination eSIMs

Best for: short trips, single destinations, occasional travelers. These are destination-specific plans priced by the day — choose your country, choose how many days, pay a flat rate. No subscription. Use code THEDUFRESNES for 5% off. Good for a two-week holiday in Thailand, a week in Japan, a long weekend in Dubai.

Holafly Plans (monthly / quarterly / annual)

Best for: frequent travelers, nomads, long-term travelers, families. Holafly Plans is a subscription covering 160+ destinations — one plan, anywhere, with unlimited data and unlimited hotspot. Use THEDUFRESNES for 10% off monthly, up to 20% off quarterly, or up to 30% off annual. See our full Holafly Plans breakdown.

The annual plan gives the biggest saving — and if you travel more than a couple of times a year internationally, it pays for itself quickly.

Why an eSIM beats the old ways

Two connectivity habits still cost travelers time and money. Here's why we don't use either anymore.

Instead of hunting for a local SIM

Local SIMs can be cheap, but they mean friction: find a store, show your passport, sometimes forms, wait for activation — and repeat every country (worse in Vietnam, China, Japan). An eSIM removes all of it: bought before you fly, live on arrival.

Instead of carrier roaming add-ons

Home-carrier roaming add-ons are almost always expensive and data-capped — often $10–15/day for limited data. Beyond a very short trip, a dedicated eSIM saves real money, with unlimited data instead of a shrinking allowance.

Real situations where Holafly has saved us

• Crossing borders in Southeast Asia: moving between Thailand, Vietnam, and Cambodia on one plan — no SIM changes, automatic network switching, unlimited data the whole way.
• Working remotely from Da Nang: tethering a laptop for video calls, uploading YouTube footage, and managing email while working from cafés with unreliable WiFi.
• Navigating Hong Kong: a dense city with constant movement between districts and MTR connections — data running continuously without worrying about limits made it seamless.
• An emergency relocation: when our apartment had a fire and we had to move cities quickly, having reliable data immediately — to find accommodation, book transport, communicate — wasn't a nice-to-have. It was essential.
• Multi-country Central America: Costa Rica, Nicaragua, Panama, and Mexico — years of travel where one plan covering borders made a genuine difference.

How to set up your Holafly eSIM: step by step

1. Go to Holafly and select your destination and number of days.
2. Apply code THEDUFRESNES at checkout.
3. Receive your QR code by email immediately.
4. On your phone: Settings → Mobile/Cellular → Add eSIM, and scan the QR code (on WiFi).
5. Label the eSIM "Holafly," set it as your data line, and turn on Data Roaming.
6. When you arrive, switch your data to the Holafly eSIM — you're connected.

Tips: install at home on WiFi, not at the airport. Keep your home SIM active for calls/texts. If it doesn't connect on landing, toggle Airplane Mode. Enable hotspot to share data.

Which Holafly plan for which trip?

• Weekend city break (2–4 days, one country): traditional eSIM, 5% off with THEDUFRESNES
• Two-week holiday (one country): traditional eSIM, 5% off
• Multi-country European trip: Europe regional eSIM or Holafly Plans
• Long-term travel or digital nomad: Holafly Plans annual, up to 30% off — see our digital nomad guide
• Frequent flyer: Holafly Plans monthly or annual
• Family travel with hotspot sharing: Holafly Plans — unlimited data with hotspot; see our family travel eSIM guide

Destinations we've covered

We've written detailed Holafly guides for specific destinations — each covering local coverage, tips, and the best plan to buy:

• Vietnam (Da Nang, Hoi An, Hanoi, Hue and more)
• Thailand and our Vietnam-to-Thailand trek
• Malaysia and Bali, Indonesia
• India and Albania
• North America (USA, Canada & Mexico)
• Plus our digital nomad & remote work guide

For the full library and every destination guide with the THEDUFRESNES code, see our complete Holafly guide.

FAQ: eSIMs for international travel

The bottom line

After nine years on the road with a family — Costa Rica, Central America, Southeast Asia, Hong Kong and beyond — how we stay connected has become one of the most important parts of how we travel. Holafly's unlimited data, broad coverage and simple setup make it our go-to for every trip. First-timer or seasoned nomad, the right eSIM removes one of travel's worst friction points.