If you've ever wondered "Can I use mobile data on a plane?" or "If I have an eSIM installed, will it connect mid-flight?", here's the short answer first. While you're in the air, cellular service (4G/5G) — including any eSIM — won't work. To get online during the flight, you use the in-flight Wi-Fi that the airline provides. Your eSIM comes into its own after you land, once you've reached your destination. In other words, if you think of it as "in the air = in-flight Wi-Fi" and "on the ground = eSIM," it's easy to prepare with confidence. This article walks through why that's the case, how the setup works, and the key differences between the two.
- Cellular data (including eSIM) doesn't work in flight — you use in-flight Wi-Fi instead
- An eSIM shines after landing, getting you online the moment you arrive
- It's the same for physical SIMs — the sky is simply out of range of cell towers
- Install your eSIM before you leave, while you still have a signal
- A data-only eSIM has no phone number and can't make calls or receive SMS, but app-based calls (e.g. WhatsApp) still work over data
The bottom line: no eSIM in the air — use in-flight Wi-Fi; the eSIM takes over after landing
Mobile service (whether an eSIM or a physical SIM) works by exchanging signals with cell towers on the ground. Inside an aircraft flying high above, there's no tower to connect to, so even with an eSIM installed you can't use mobile data in flight. If you really need to get online during the flight, you use the in-flight Wi-Fi built into the aircraft (only on flights that offer it). Your eSIM, on the other hand, is ready the moment you switch the line on after you land and arrive at your destination — so you can be online right from the arrivals hall or on the way into town. You can find an eSIM for your destination on our eSIM comparison page. If you'd like to weigh up your connectivity options abroad more broadly, take a look at our guide comparing ways to stay connected overseas.
Why won't an eSIM (cellular service) connect on a plane?
Your phone's cellular service relies on sending and receiving signals with cell towers (antennas) on the ground. A plane cruises at around 10,000 meters at high speed, so the signal from ground-based towers doesn't reach you reliably. On top of that, including during takeoff and landing, you're asked to switch your phone to airplane mode so that signal-emitting devices don't interfere with the aircraft's instruments. Airplane mode turns off cellular, Wi-Fi, and Bluetooth all at once, and your eSIM is unavailable while it's on.
This isn't an "eSIMs don't work" problem — it's exactly the same with a physical SIM. It helps to understand that cellular technology as a whole simply can't be used in the air.
In-flight Wi-Fi vs. eSIM: the key differences
Both are ways to get online, but where they work and how they work are quite different. Here's a quick overview.
| Item | In-flight Wi-Fi | eSIM (cellular) |
|---|---|---|
| Where it works | Inside the aircraft (flights that offer it) | On the ground after landing (in supported areas) |
| How to connect | Keep airplane mode on and switch Wi-Fi on | Turn on mobile data after you arrive |
| Provided by | The airline (varies by flight and aircraft) | An eSIM provider |
| How pricing works | Varies by flight, route, and plan (free or paid) | Chosen by destination, data amount, and number of days |
| Speed tendency | Shared among many passengers, so it can fluctuate | Depends on the local network, area, and congestion |
Whether in-flight Wi-Fi is available, how much it costs, and how fast it is vary widely by airline, route, and aircraft (as of June 2026). Check the airline's latest information to see whether it's offered on your specific flight. It's also reassuring to confirm in advance whether your device supports eSIM using our eSIM device compatibility checker.
How to get online during a flight (airplane mode + Wi-Fi setup)
On flights that offer in-flight Wi-Fi, you can stay in airplane mode and simply turn Wi-Fi back on to get online. The general steps are as follows.
The basic flow on iPhone and Android
- Before takeoff, follow the crew's instructions and turn airplane mode ON.
- Leave airplane mode on, then turn only Wi-Fi back ON from Settings or the Control Center.
- Select the in-flight Wi-Fi network name that appears and connect.
- Complete sign-up and payment on the page that opens automatically (or the specified site).
The key point is that airplane mode doesn't mean "all connectivity off" — you can keep airplane mode on and switch just Wi-Fi on afterward. If the connection page doesn't appear or you can't connect, our troubleshooting guide for connection problems may help.
How to switch your eSIM on after landing
Once you arrive at your destination, it's finally your eSIM's moment. If you install the eSIM before you leave, all you have to do after landing is switch it on, and you're up and running smoothly.
The basic steps after arrival
- Before departure — somewhere with a connection, such as home or the airport — install your eSIM.
- After landing, once you no longer need in-flight Wi-Fi, turn airplane mode OFF.
- In Settings, turn mobile data ON for the eSIM (your destination plan).
- If needed, turn on data roaming, and set the APN if one has been provided.
- Confirm that you have signal bars and that you're online.
The timing for installing and activating an eSIM can vary by plan. You can find the specific steps after purchase in our eSIM setup guide. As a rule, installation should be done where you have a signal, so we recommend finishing it before you depart rather than trying — and failing — to scan a QR code on the plane.
Things to keep in mind when using in-flight Wi-Fi and an eSIM
Knowing how it all works helps you avoid stumbling on the day.
- Not every flight has in-flight Wi-Fi: Short-haul routes and some aircraft may not offer it. Check the details for your flight in advance.
- Don't expect too much from speed or stability: Because it's shared among many passengers, it can slow down when busy, and it may not be well suited to data-heavy activities like streaming video.
- Don't forget to turn airplane mode back off: If you forget to disable airplane mode after landing, your eSIM won't connect and it's easy to panic and think something's broken. Check airplane mode first.
- An eSIM is generally data-only: Like Bloomy, many travel eSIMs are data-only — there's no phone number, and they can't make voice calls or receive SMS verification codes. If you need a phone number for calls or SMS authentication, look into other options too (such as a local plan that includes a number, or keeping your usual number active). App-based calls like WhatsApp can often be used wherever you have a working data connection.
If you'd like to understand more about how numbers and SMS are handled, take a look at our articles on phone numbers and SMS.
Getting your destination eSIM ready with Bloomy
In-flight Wi-Fi is only for getting online "inside the plane," so you need to arrange your connectivity for after you arrive separately — and that's where an eSIM comes in. With Bloomy, you can choose a plan to match your destination, data amount, and number of days. Pricing, data amounts, and supported countries can change, so please check the latest details on our eSIM comparison page (as of June 2026). For longer stays, or when it's hard to predict how much data you'll use, an unlimited-style plan like Bloomy Unlimited Max can be a good option. Unlimited plans suit extended use, but they may come with a fair use policy, reduced speeds after a certain amount of usage, and conditions on tethering, so it's worth checking the latest terms before you buy. Just keep in mind that it doesn't mean "use as much as you want with no limits whatsoever."
If this is your first time, start by checking whether your device supports eSIM, and finish the setup before you depart — that way you can be online the moment you land, with real peace of mind.
Frequently Asked Questions (FAQ)
Here are some of the questions we hear most often about in-flight Wi-Fi and eSIMs.
