A travel eSIM is the cheapest, simplest way to get mobile data abroad — no plastic SIM, no airport kiosk. Here is exactly how to use one.
Tip: install your eSIM on Wi-Fi before you fly. Installation needs internet, and you don’t want to be doing it at the arrivals hall.
Step 1: check your phone is compatible
You need an eSIM-capable and carrier-unlocked phone. Most iPhones from the XS onward, recent Samsung Galaxy S/Note/Z models and Google Pixel 3+ support eSIM. Dial your settings to confirm, or check the provider’s compatibility page.
Step 2: buy a plan for your destination
Pick a plan sized to your trip. Compare by price-per-GB — bigger plans are cheaper per GB:
| Trip data use | Suggested plan |
|---|---|
| Light (maps, chat) | 1–3 GB |
| Normal (browsing + some video) | 5 GB |
| Heavy (streaming, hotspot) | 10–20 GB or unlimited |
Find the cheapest option for your country in the country comparisons, or model two plans in the price-per-GB calculator.
Step 3: install the eSIM (on Wi-Fi, before you fly)
After purchase the provider sends a QR code. On your phone: open the eSIM/add-plan setting and scan it, or use the provider’s app to install in one tap. The plan is now stored on your phone — it usually does not start counting until you use it abroad.
Step 4: on arrival, switch data to the eSIM
When you land:
- Turn on the eSIM line.
- Enable data roaming for the eSIM line only.
- Set the eSIM as your mobile data line.
- Turn off roaming on your home SIM so it isn’t charged.
Your home number still works for calls and texts; data flows through the cheap eSIM.
Common mistakes to avoid
- Leaving home-SIM roaming on — the classic way to get a surprise bill. See is an eSIM cheaper than roaming?.
- Buying a 1GB plan and topping up repeatedly — a 5GB plan is cheaper per GB.
- Installing at the airport — do it on home Wi-Fi instead.
Where next
Pick your destination — USA, Japan, Europe — or compare the providers.
Sources and accuracy
General guidance based on the major providers’ published setup instructions (Airalo, Saily, Holafly). Steps vary slightly by phone and plan; follow your provider’s exact instructions. See our methodology.