eSIM not working after landing? The fixes, in the order that works

You land, switch off airplane mode, and the eSIM you installed three days ago does nothing. Either there are full bars and no internet, or there are no bars at all. This is the single most common problem travellers write to us about, and in most cases the fix takes under a minute. The catch is doing the checks in the right order, because the first three settings solve around ninety percent of cases and the rest are for the stubborn ten.

Work down this list. Stop when it connects.

1Turn on data roaming for the eSIM line

This is the one. A travel eSIM is a roaming profile. Even a plan sold as a Japan eSIM is usually a line registered somewhere else that roams onto Japanese networks, so the phone treats every byte as roaming data. If roaming is off for that line, the phone sees the tower, shows you signal, and refuses to send anything.

• iPhone: Settings, then Cellular (or Mobile Data), tap the travel eSIM line, switch Data Roaming on.
• Android: Settings, then Connections or Network, then SIM manager or Mobile networks, pick the eSIM, switch Data roaming on.

Keep roaming off on your home SIM. The two lines have separate switches, and leaving your home line free to roam is how surprise bills happen.

2Make the eSIM your data line

Installing an eSIM does not make the phone use it. If your home SIM is still the default for mobile data, the eSIM sits idle while your home carrier either roams at its own rates or blocks data completely.

• iPhone: Settings, Cellular, Cellular Data, choose the travel eSIM. Then scroll down and turn off Allow Cellular Data Switching, or the phone may quietly fall back to your home SIM when the eSIM signal dips.
• Android: Settings, Connections, SIM manager, Mobile data, choose the eSIM.

3Airplane mode for thirty seconds

A phone that has been searching for a network through a long flight sometimes gets stuck on the last tower it saw. Airplane mode on, count to thirty, airplane mode off. That forces a fresh scan. If nothing changes, do a full restart. Between them, these two solve most of what steps one and two missed.

4Check the line is actually enabled

On iPhone the eSIM line has its own on and off toggle, labelled Turn On This Line. It can end up off after an iOS update or if the line was installed while another eSIM was active. Android hides the same thing under SIM manager. An installed line that is switched off looks exactly like a broken one.

5Pick the network manually

Most travel eSIMs can roam on more than one local network, and the phone is supposed to choose. Sometimes it picks one the plan does not actually have an agreement with, and you get bars with no data. Turn off automatic network selection and pick each listed network in turn, waiting a minute on each.

• iPhone: Settings, Cellular, the eSIM line, Network Selection, switch Automatic off, choose from the list.
• Android: Settings, Connections, Mobile networks, Network operators, search, choose.

The seller's plan page or activation email normally names the networks the plan uses. If it does not, that is a mark against the seller, and we note it on their provider page.

6Check the APN

The APN is the address the phone uses to reach the internet through a given network. Most eSIMs set it automatically. A few need it typed in, and the activation email will say so. If your email mentions an APN and the field on the phone is blank or different, that is your problem.

• iPhone: Settings, Cellular, the eSIM line, Cellular Data Network (this menu only appears when the plan allows editing).
• Android: Settings, Connections, Mobile networks, Access Point Names.

7Confirm the plan actually covers where you are

This one stings. Regional plans cover a list of countries, and the list is narrower than the region name suggests. Europe plans that skip Switzerland, Turkey or the Balkans are common. Asia plans that skip Vietnam or the Philippines are common. We track 68,419 live plans and publish the exact coverage list for every one, because a plan that covers 35 areas is not the same as a plan that covers the place you are standing.

If you crossed a border and it died, this is almost certainly why.

8Check that the plan has started, and has data left

Some plans start counting from purchase, not from first use. If you bought a seven day plan ten days ago, it is finished. Others require a first connection within a window, often thirty to sixty days, or the QR code is void. And a plan you used heavily on WiFi free days may simply be empty. Open the seller's app or account page and read the balance and expiry before assuming the network is at fault.

9Rule out a carrier lock

If none of the above works and the eSIM has never connected anywhere, check whether your phone is locked to your home carrier. On iPhone, Settings, General, About, look for Carrier Lock. It should read No SIM restrictions. A locked phone will accept the eSIM install and then refuse to use it, which is a confusing failure. Only your home carrier can remove the lock, and that is usually a five minute request that takes a day or two to process. Do it before the next trip.

When to stop and ask for a refund

If you have done all nine and the line has never carried a single byte, the eSIM is faulty or the plan does not cover your location, and neither is your fault. Contact the seller while you are still in the country. Screenshot the settings screens, note the networks you tried, and ask them to regenerate the code or refund. Sellers with real support will do one or the other the same day. Sellers without it are the reason we started tracking support quality alongside price.

A note on what we learned building this

We compare 21 sellers across 215 countries, and the failure that generates the most support tickets across all of them is the same one: roaming off on the eSIM line. It is a settings problem, not a product problem. But the second most common cause is a coverage list that did not include the country, and that one is entirely on the seller for burying it. Every plan on our site shows its coverage list up front, ranked by real price per GB, so you can see before you buy whether the cheap Europe plan actually includes the country you are flying to.