Guide

Wi-Fi on a plane: airplane mode, in-flight internet and your eSIM

What airplane mode actually switches off, how in-flight Wi-Fi works and why it crawls, what happens to your travel eSIM in the air, and what to turn on the moment you land.

Published September 29, 2026 · Updated October 1, 2026 · 9 min read · MoreSim editorial team

There’s no normal mobile signal on a plane: your phone goes into airplane mode for the flight and stops looking for a cellular network. The only internet on board is the airline’s Wi-Fi, if that aircraft has it, and it’s almost always slower than what you get on the ground. Your eSIM doesn’t go anywhere in the meantime: the profile stays on the phone, the plan isn’t being used up, and it comes to life once you’re on the ground at your destination.

What airplane mode actually switches off

Airplane mode exists to stop your phone transmitting. Normally the handset is constantly hunting for cell towers and raising its transmit power when the signal is weak. At altitude it finds no towers at all, so it runs flat out for nothing, and dozens of phones doing the same thing in one cabin add radio noise right next to the aircraft’s equipment. The specific rules for electronics on board are the airline’s, and the crew announces them before departure.

Airplane mode switches off every transmitter at once: the cellular radio, Wi-Fi and Bluetooth. On most modern phones you can turn Wi-Fi and Bluetooth back on manually while staying in airplane mode — that’s exactly how people join the cabin network and pair their headphones. Menu names and behavior depend on your phone model and system version.

Satellite positioning works differently: the receiver transmits nothing and only listens, so on many phones it keeps working in airplane mode. It still won’t download a map, though — save the map itself and your route offline before you fly.

What works and what doesn’t in airplane mode

In airplane mode you keep everything that doesn’t need a connection: camera, music, notes, downloaded books, movies and offline maps. Everything that reaches out to the internet goes away: calls, texts, messaging apps, email, streaming and cloud sync. Messages you type in the air sit in a queue and send themselves once you’re back online.

How in-flight Wi-Fi works and why it’s slow

In-flight Wi-Fi is just an access point in the cabin with a link to the outside world, and that link comes in two flavors. Satellite: an antenna on the fuselage talks to a satellite, which works anywhere, including over the ocean. Air-to-ground: the aircraft picks up dedicated towers on the ground that point skyward. Air-to-ground is simpler to build out, but it only works over territory where those towers have been built.

What makes in-flight internet slow isn’t the hardware in the cabin, it’s that outside link. Its bandwidth is limited and split between everyone who logs on, so the busier the cabin network, the less each person gets. A satellite link adds latency on top: the signal has to travel up to the satellite and back, so responses take noticeably longer than on the ground.

That’s why messaging, email and light web pages usually go through on in-flight Wi-Fi while video, large downloads and video calls don’t. A video call needs bandwidth and low latency at the same time, and the in-flight link gives you neither. Many airlines also ban voice and video calls outright so conversations don’t bother the rest of the cabin.

What happens to your eSIM in flight

Your eSIM stays on the phone in flight, it just doesn’t do anything. The profile lives in the chip and airplane mode can’t erase it; the phone simply stops scanning, so the eSIM never registers with a carrier. After landing you only need to leave airplane mode — no reinstalling the profile, no rescanning the QR code.

A travel plan isn’t used up in the air either. A MoreSim plan starts counting from your first connection to a network in the destination country, and there is no such connection in flight. That’s why it’s fine to install the eSIM at home on Wi-Fi a day or two before departure: the profile just sits there and doesn’t eat into your days.

Install it at home rather than at the departure airport. Installing from a QR code needs a stable connection, and airport Wi-Fi with a suitcase in one hand and a check-in line in front of you is not where you want to find that out. While you’re at it, run the phone compatibility check in the @moresim_bot Telegram bot at home, so you don’t discover at the gate that your model doesn’t support eSIM. Our guide to installing and activating an eSIM walks through the steps for iPhone and Android.

An hour before takeoff and the minute you land

An hour before departure is worth a few minutes of offline prep: you can’t download anything in the air, and the first things you reach for after landing are usually the map, the boarding pass and the address of where you’re staying.

1. Download an offline map of the whole arrival city, not just the block around your hotel.
2. Save your boarding pass in the app and as a screenshot, in case the app asks for internet.
3. Save your accommodation booking offline, plus the address in the local language and your host’s phone number.
4. Download an offline translator dictionary, along with music, podcasts and movies for the flight.
5. Check that your eSIM is installed and label the line something obvious, like “Thailand”.
6. Switch on airplane mode as you board and leave it on until the crew says otherwise.
7. After landing, turn airplane mode off and give the phone a minute or two to find a local network.
8. Assign mobile data to the right line, turn data roaming on for it, and turn data off on your home SIM.

Layovers: what to switch on in a transit airport

For layovers the rule is simple: if you’re not leaving the transit area and your next flight is a couple of hours away, airport Wi-Fi is enough. Turning mobile data on just to answer messages buys you little, while the risk of a surprise bill from your home SIM’s roaming is very real.

Travel eSIMs have one quirk at layovers. A single-country plan simply won’t work in a transit country, because none of its networks are there. A regional or global plan, though, can connect to a network in the layover country, and then your plan’s clock starts there rather than in the country you actually bought it for. If you’d rather start later, don’t switch the eSIM line on until you land at your final destination.

A long layover where you go into the city or stay overnight is effectively another country on your itinerary, so plan data for it the same way you would for the main one: either its own plan, or a plan whose zone already covers it.

After landing: how to check data is running on the right line

You can leave airplane mode once the crew gives the word, usually while taxiing to the terminal or after the aircraft has stopped. The phone needs a moment to find a local network and register on it — a minute or two is normal, especially at a big airport where a whole arriving aircraft hits the networks at once.

Then check that data is actually running on the line you want. In your cellular settings, mobile data should be assigned to the travel eSIM, data roaming should be on for that line, and mobile data should be off on your home SIM. Otherwise the phone will happily work — via your home carrier’s roaming, with your travel plan sitting untouched. Our guide to running two lines in one phone walks through the settings.

• No network after a few minutes: toggle airplane mode off and on again.
• Empty network list: pick a carrier manually in your cellular settings.
• Signal but no pages loading: check which line mobile data is assigned to and whether data roaming is on for it.
• Menu names vary — they depend on your phone model and system version.
• If none of that helps, MoreSim support is available via /support in the @moresim_bot Telegram bot, a ticket in your account or email.

One last heads-up about the aircraft itself: whether your flight has Wi-Fi, whether it’s included in your fare, and whether messaging and calls are allowed is entirely up to the airline, and those rules change. As of September 2026 there’s no single standard even within one carrier: different aircraft types carry different equipment, and the aircraft on your route can be swapped. Check with the airline before you fly, on the flight’s page or with the crew.