Your eSIM will not connect after landing: what to check, in order

You land, switch off airplane mode and nothing happens. No maps, no WhatsApp, no way to tell anyone you arrived. It is a terrible moment to start investigating, so this guide gets to the point: the three faults behind almost every case, in the order you should check them, and what to do next if it still will not work.

One thing first, because it saves half the panic: wait two or three minutes. Registering on a foreign network is not instant, and in a large airport there are thousands of phones coming out of airplane mode at the same time. Plenty of people write off an eSIM that just needed another minute.

The three faults behind almost everything

In order. Do not skip any of them even if you are sure — the first one is by far the most common, and also the one people are most certain they got right.

1. Data roaming is off on the eSIM

This is fault number one, and it is nowhere near the second.

The symptom is easy to spot: at the top you can see the name of a carrier you do not recognise, and even the signal bars, but nothing loads. That means the phone has registered on the local network, but it has no permission to use data over it.

Go into the settings of the eSIM line (not your home SIM) and find “Data roaming”. Turn it on.

Switching roaming on feels wrong when you bought an eSIM precisely to avoid roaming charges, which is why many people deliberately leave it off. But they are two different things: technically, your foreign eSIM connects to local masts while roaming, and that switch is what allows it. With a data plan already paid for, turning it on costs you nothing.

2. Data is still going through your home SIM

Second suspect: the phone has two lines and is still trying to use the usual one for data.

There are two things to do here, and both matter:

• Set the eSIM as the mobile data line. On iPhone: Settings → Mobile Data → “Mobile Data” (right at the top, where you pick the line). On Android it is usually called “Preferred SIM for mobile data”, inside the SIM manager.
• Turn off mobile data on your home SIM. Not the whole line — that way you keep receiving calls and texts from your number, including your bank’s — just its data. This is the only thing standing between a normal trip and an unpleasant roaming bill when you get back.

On iPhone there is one specific trap: the “Allow Mobile Data Switching” option. Left on, the iPhone can jump back to your home line on its own when the eSIM is slow to respond, and charge you roaming without you noticing. Leave it unticked.

3. You are not inside the plan’s area

Less common, but it happens: the eSIM works perfectly and the problem is that the country you are in is not in the plan.

The typical case is a layover. A Japan eSIM will not give you signal in Dubai, and it is not broken because of it. The same goes if your trip crosses into a neighbouring country you assumed was included: single-country plans cover that country and nothing else.

If your route goes through several countries, what you want is a regional plan rather than a national one. The destination pages show which countries each plan covers before you buy.

Still nothing: do this, in this order

When the three above are correct and there is still no internet, this is the sequence. Least invasive first.

Airplane mode on, ten seconds, off. It forces the phone to search for networks again from scratch. Then wait two or three minutes, not ten seconds. It fixes more cases than you would think.

Pick the network by hand. In the eSIM line’s settings, go into “Network selection” or “Carrier” and turn off automatic mode. A list of available carriers appears. Pick one; if it does not work, go back and try the next. It is slow and boring, but it is the tool that unblocks the odd cases: sometimes the phone insists on a network your eSIM has no agreement with, and by hand you can move it to one that does.

Restart the whole phone. Turning it off and on fixes considerably more than its reputation suggests, especially when the profile downloaded halfway.

Look at the APN, but do not invent one. The access point configures itself in virtually every case and should not be touched. If you have got this far, look at what APN the eSIM settings show and write to us with whatever it says. A made-up APN leaves the line dead and makes diagnosis harder.

What you must never do

Do not delete the eSIM from your phone to “install it again”. This is the most expensive mistake on the list.

The QR code is good for one installation, on one device. It is not like a password you can reuse: scanning it downloads and consumes that profile. If you delete the profile from the phone, the same QR cannot load it back, and a new one has to be issued.

It is a natural reflex when something does not work — uninstall and reinstall — and here it is exactly the wrong move. Before deleting anything, get in touch.

Less common, but real

• The phone is carrier-locked. If you bought it on contract and it is still tied to that carrier, it will not accept someone else’s eSIM. Check before you travel; the full test is on the compatibility page.
• The profile downloaded halfway. With flaky airport wifi it happens. A restart usually settles it.
• The plan ran out. If it was working fine and suddenly stopped, check the remaining data and days on your order page before assuming a technical fault. If you are not sure how much data you needed, the guide on how much data a trip takes has the figures app by app.
• Validity had already started. The days count from the first connection at the destination, not from purchase. If you tested the eSIM before leaving and it did manage to connect, the clock started there.

And one thing no setting can fix

If there is no mast where you are, no eSIM will work. Not ours, not anyone’s, not a SIM bought in the shop round the corner. A valley between mountains, a train in the middle of nowhere or a small island out of season are places with no coverage for everybody equally.

It is worth telling that apart from a real fault before spending half an hour fighting the settings: if the person next to you, on a local SIM, has no signal either, it is not your eSIM.

When to write, and what to tell us

If you have done the above and still have no internet, write instead of carrying on. So the reply is useful first time, tell us these four things:

1. Your order number (or the link to your order page).
2. The exact make and model of the phone.
3. Where you are and since when.
4. A screenshot of the eSIM settings, showing data roaming and which line is set for data.

That solves most cases in a couple of messages. And if it turns out the eSIM cannot be made to work on your phone, you get your money back: it is in the terms, not a favour.

If you have not bought yet and are reading this as a precaution, good instinct: half an hour of reading at home beats half an hour of stress in an airport. You can look at plans by destination once you are clear.