Last updated: 22 October 2026
No. A travel eSIM does not work in the air, because cellular service is off in flight on almost every airline: in the US, an FCC rule says cell phones must not be operated while an aircraft is airborne, and crews on most airlines ask for airplane mode. To get online during the flight you use the plane's Wi-Fi, which is a separate service and free on some airlines; your eSIM picks up a network again once you land in a country its plan covers.
| Where you are | Does the travel eSIM connect? |
|---|---|
| At home, at the departure gate | Only if your plan covers that country (most trips: no) |
| In the air | No. Use the plane's Wi-Fi |
| On a layover in a covered country | Yes, once airplane mode is off, and the plan may start there |
| After landing in your destination | Yes: airplane mode off, data roaming on for the eSIM |
Why your eSIM does not work in flight
An eSIM is a SIM in software: it connects to the same ground networks as a plastic SIM, under the same rules. In the US, 47 CFR 22.925 says cellular phones carried aboard aircraft must not be operated while the aircraft is airborne. Airlines elsewhere set their own rules, and the crew's instructions apply on board.
So in the air, your home line and your travel eSIM are both off. Airplane mode turns off the cellular radios, but you can switch Wi-Fi and Bluetooth back on while it stays on: that is how you join the plane's Wi-Fi and use wireless headphones.
In-flight Wi-Fi: what is free, and where
In-flight Wi-Fi does not use your eSIM or your phone plan. It is the airline's own connection, through satellites or ground stations, and you sign in on a web page or in the airline's app.
- Delta: free for SkyMiles members on nearly every flight, domestic and international, according to Delta's Wi-Fi page. Delta says some flights still require payment, and SkyMiles membership is free; you can join on board.
- United: its Starlink Wi-Fi is free for MileagePlus members on the flights that have it. United is still fitting it across the fleet, and its Starlink tracker shows whether your flight is equipped.
- Other airlines: many charge for Wi-Fi, and some offer free messaging only. Check the airline's site or app before you fly.
Join the airline's loyalty program before you leave home if its Wi-Fi depends on it: signing up over a slow plane connection is a chore.
Install your eSIM before you fly
Installing an eSIM needs an internet connection, and the QR code comes by email, so do it on the ground:
- Best: at home, on the day you leave. Install it on your home Wi-Fi, then leave the line on and let it wait. With our plans, the QR code arrives by email within minutes of buying, with one-tap install links for iPhone and Android.
- Fine: at the departure gate on the airport's Wi-Fi, if you forgot.
- In the air, only if the plane's Wi-Fi works well enough to load your email and download the profile. Do not count on it.
Our step-by-step guides cover iPhone and Android.
When does the plan start?
For most of our plans, the days start counting when the eSIM first connects to a network in a covered country, not when you buy it or install it. Each plan states its own rule before you pay.
That means:
- At your home airport, the eSIM shows "No Service" if your home country is not covered. That is normal, and the plan has not started.
- On a layover in a covered country, turning airplane mode off connects the eSIM and starts the plan there. If you would rather keep the days for later, leave airplane mode on during the stopover and use the airport's Wi-Fi.
- In your destination, the plan starts when the eSIM first connects after landing.
What to switch on when you land
- Turn off airplane mode once the crew says phones can be used.
- Choose the travel eSIM for data. On iPhone: Settings > Cellular > Cellular Data. On Android: your SIM settings.
- Turn on data roaming for the travel eSIM only. Travel eSIMs connect through local partner networks, so they need roaming on. Keep it off on your home line if your carrier charges abroad: our guide What is data roaming? explains why.
- Give it a minute or two to find a network.
If nothing connects after a few minutes, work through eSIM not working abroad. Heading to Europe from the US? Will my phone work in Europe? covers what your carrier charges there.
Can you use a phone on a plane in Europe?
Not over the regular networks. In November 2022 the European Commission updated its rules so that airlines can offer 5G on board through an onboard small cell, connected by satellite, and gave EU countries until 30 June 2023 to make the frequencies available. That makes in-flight mobile service possible, not automatic: it depends on the airline equipping the aircraft, and the crew's rules still apply. A travel eSIM's plan covers the countries it lists, not an airline's onboard network.
FAQ
Does an eSIM work on a plane?
No. Cellular service is off in flight, for an eSIM as for a physical SIM. Use the plane's Wi-Fi if it has one, and your eSIM connects again after landing in a country its plan covers.
Can I use Wi-Fi with my eSIM in airplane mode?
Yes. Airplane mode turns off the cellular radios, and you can switch Wi-Fi back on while it stays on. In-flight Wi-Fi does not use your eSIM's data.
Should I install my eSIM before my flight?
Yes. Installing needs internet, so do it at home on the day you leave, or at the gate on airport Wi-Fi. On most plans the days only start when the eSIM first connects in a covered country.
Will my eSIM work at the departure airport?
Only if your plan covers that country. Otherwise it shows "No Service" until you land, which is normal.
Is in-flight Wi-Fi free?
On some airlines. Delta says Wi-Fi is free for SkyMiles members on nearly every flight, and United's Starlink Wi-Fi is free for MileagePlus members on equipped flights. Elsewhere it is often paid.
Will a layover start my eSIM plan?
It can. If the layover is in a country your plan covers, turning airplane mode off connects the eSIM and starts the plan there. Keep airplane mode on and use airport Wi-Fi if you want to save the days.
Facts checked on 22 October 2026 against the eCFR text of 47 CFR 22.925, Delta's and United's Wi-Fi pages, the European Commission's 2022 decision on mobile communications on aircraft, and our own plans.