Deep dive

Which countries don’t support eSIM? Why an eSIM fails abroad

Three different reasons an eSIM may not work abroad: the plan’s coverage zone, the provider’s partner networks, and places the signal simply can’t reach.

Published September 13, 2026 · Updated October 1, 2026 · 9 min read · MoreSim editorial team

There’s no universal list of countries where eSIM doesn’t work: what works or fails is a specific plan, not the technology. When a travel eSIM won’t connect abroad, it’s almost always one of three things: the country isn’t in the plan’s coverage zone, the plan’s provider has no available network there, or the signal can’t reach where you’re standing. Each one has its own check, and you can rule out two of the three before you fly.

Why “which countries don’t support eSIM” is the wrong question

It’s the wrong question because an eSIM is not a carrier or a network — it’s a way to store a profile on your phone without a plastic card. What works is exactly what’s written into the profile: a set of countries, partner networks and the terms of a specific plan. So the right question is different: does this particular plan work where I’m going?

There’s no universal list of “countries without eSIM”. Coverage zones differ from plan to plan and change over time, so any list from the internet goes stale faster than you can pack your bag. Check against the card of the plan you’re buying, and if in doubt, ask support.

Reason one: the country isn’t in the plan’s coverage zone

Most often an eSIM fails because the country isn’t on the list of the plan you bought. A regional plan isn’t “the whole continent” or “all of Asia” in the everyday sense; it’s a specific list of countries. Montenegro, Albania, the UK, Switzerland and Georgia are typical borderline cases: people assume they’re part of the region, but they may not be on the list.

Global plans work the same way. The word “global” in the name doesn’t mean every country on the planet; it’s also a list, just a long one. MoreSim covers 200+ destinations, and the rule still holds: open the plan card and find your country with your own eyes.

Check transit countries separately too. If your route has a layover and you’re spending the night in a third country, it isn’t automatically included in your plan.

Reason two: the provider has no network in that country

The second reason is that the plan’s provider has no network it’s allowed to use in that country: an eSIM doesn’t build cell towers. It connects to local carriers’ networks through partner agreements. If the provider has no agreement in a country, or local regulations restrict foreign carriers, your phone simply won’t find a network it’s allowed to use, even though everything on your side is set up correctly.

There’s an in-between case: there is a partner, but only one. Then you technically have coverage, but wherever that particular carrier is weak you’ll have nothing, even if the person next to you with a local SIM from another carrier is scrolling away happily.

Another variation is restrictions on specific roaming services imposed by the regulator or by the local carrier itself. Phone settings won’t fix this; it comes down to choosing the right plan. For unusual destinations, ask support in advance which networks are available there.

Reason three: there is a network, but the signal can’t reach you

Sometimes the country has a network, but the signal can’t reach where you’re standing, and the eSIM has nothing to do with it. Radio signals don’t pass through thick concrete, rock and water, and no plan can change that. If you’re in an underpass or heading down into an old basement restaurant, a local with a regular SIM will lose data too.

• Subways, tunnels and underground parking: there’s coverage only where it has been specially installed.
• Mountains and gorges: the terrain blocks the signal, and a mountain pass may have nothing at all.
• Deserts and sparsely populated areas: towers go where people live.
• The sea, ferries and cruises: a few kilometers from shore, land networks run out.
• Old buildings with thick walls, basements, elevators and ground floors below street level.
• On a plane: the phone is in airplane mode and land networks are out of reach.

Does an eSIM work in the subway, on a ferry or on a plane?

An eSIM works in the subway and on a ferry wherever a land network reaches, and on a plane there’s no mobile network at all. In the subway, it depends on the city and even on the line: some systems have coverage throughout the tunnels, others only at stations, with signal dropping between them. You can’t predict it in advance, so keep your route, maps and tickets downloaded.

Ferries are a different story. While the ship sails along the coast, your phone usually latches onto land networks. Out in open sea, all that’s left is the ship’s satellite service, which is the operator’s service with its own rules, not mobile data from your plan. In port, data comes from a plan for the country where the ship is docked: check the catalog for a regional plan that covers your route, and if there isn’t one, install local plans for each country in advance.

On a plane there’s no mobile network by definition: the phone is in airplane mode. In-flight Wi-Fi, if available, is the airline’s service and has nothing to do with your eSIM.

Can your phone miss the right network bands?

Yes: phones built for different markets support different sets of frequency bands, and yours may physically be unable to pick up the ones some local networks use. A version bought in one country may cling to a slow network in another while everyone around you is on a fast one. It depends on the model and the market the phone was built for.

Plain incompatibility belongs here too: not every phone supports eSIM, and on some models support depends on the market it was sold in and the firmware version. The bot @moresim_bot has a built-in phone compatibility check, a one-minute job that saves a lot of stress. You can also check yourself: dial *#06#, and if the screen shows an EID, the phone has an eSIM chip.

What to do if you have no signal on a trip

If you have no signal on a trip, check your phone settings first — the mobile data line and data roaming on the eSIM — and only then the plan’s coverage and the local network. The steps are the same whichever country you’re in.

1. Turn airplane mode on and off and wait a minute: the phone will search for a network again.
2. Check which line is set for mobile data; on a dual-line phone it’s easy to leave your home line active. Turn off mobile data on your home SIM, but keep the line itself on if you’re expecting texts from your bank.
3. Turn on data roaming for the travel eSIM line: most travel eSIMs connect to a local carrier as a roaming network, and without it you won’t get online. If your plan’s instructions say otherwise, follow them.
4. Restart the whole phone, not just the cellular connection.
5. Try selecting the network manually in your carrier settings: sometimes the phone stubbornly clings to one it can’t use.
6. Step outside or come up from the underground level and see if signal bars appear.
7. If nothing helps, contact support with the country, city and phone model.

If your data doesn’t come on, first check with us whether the country is in your plan’s zone. Then we check which line is set for data and whether data roaming is on for it. Send /support to the bot or open a ticket in your account, and we’ll get back to you.