eSIM for USA: a guide for UK, EU and Australian visitors

Yes: for most visitors from the UK, the EU and Australia, an eSIM for USA travel is the cheapest straightforward way to stay online. Home plans rarely include the US, so roaming usually means a daily fee every day your phone connects. A travel eSIM is one price for the trip, set up before you fly, and your normal SIM stays in the phone.

You're probably here because a US trip is booked and your network's roaming page looks expensive or confusing. The numbers do add up fast: Vodafone UK charges £8 a day in its Zone C, which includes the US, on most pay monthly plans from 14 April 2026. That's £112 for a fortnight, for one phone.

Below: what roaming costs from each region, and US-only versus North America plans. Then how much data a US trip uses, setup step by step, and where American signal disappears.

Do you need an eSIM for the USA?

You need one if your home plan doesn't include the US and you want mobile data without a daily roaming fee. That's the situation for most UK, EU and Australian travellers. If your plan already includes the US at no extra cost, you may not need an eSIM at all, so check that first.

There are three common situations:

• Your plan includes the US. Some premium UK and Australian plans do. Use it, and keep an eye on any fair-use cap.
• Your plan charges a daily fee. This is the most common case. You pay on every day your phone connects, even for a background app refresh.
• Your plan has no US roaming, or pay-as-you-go rates. Per-megabyte rates are the most expensive way to use data abroad.

EU travellers sometimes assume their free roaming goes everywhere. It doesn't. The EU's "roam like at home" rules cover the 27 EU countries plus Iceland, Liechtenstein and Norway, and countries outside that area aren't covered.

What does roaming in the US cost from the UK, EU and Australia?

As of November 2026, UK networks that publish a US daily rate charge around £8 a day on newer plans. Telstra in Australia charges AU$10 a day. The exact figure depends on your plan and when you joined, so treat this as a guide and check your own.

How a daily fee adds up over a trip

Here's our own arithmetic, multiplying each published daily rate by the number of days. It assumes your phone connects every day, which it will if roaming is switched on.

Two things make the real bill higher than people expect:

1. It's per phone. A couple pays twice. A family of four pays four times.
2. You can't undo a day. Telstra's own terms say that if you cancel the Day Pass or turn roaming off during a day, you're still charged for that day.

A travel eSIM works differently: you pay once for a set amount of data or a set number of days. The destination page shows the price before you pay, so you can compare it directly with the totals above.

How does a US travel eSIM work?

A travel eSIM is a data plan you download onto the SIM chip built into your phone. It sits alongside your normal SIM as a second line. When you land and switch it on, your phone connects to a partner network in the US, just as it would with a local SIM card.

With kimsim, three things are worth knowing up front:

• The plan starts on arrival. Your plan's days start when the eSIM first connects to a network in the US, not when you buy or install it. You can install it up to 180 days before your trip.
• It's prepaid. Your phone treats the eSIM as roaming, so you switch Data Roaming on for it, but you won't be charged roaming for that line.
• Your home SIM stays. You can leave your normal line on for calls and texts while the eSIM does all the data.

Each destination page lists the partner networks and whether they're 4G or 5G. New to all this? Our plain-English guide to eSIMs covers the basics, and the phone check tells you whether your phone supports one.

Which US eSIM plan should you choose?

Pick the coverage first, then the type of data. Coverage is about where you'll be; data type is about how heavily you'll use your phone. Getting the coverage wrong is the mistake that matters, because a US-only plan won't work over the border.

Step 1: coverage

• Staying in the United States? A US plan is all you need.
• Also visiting Canada or Mexico? A North America plan covers the US, Canada and Mexico on one eSIM. That suits Niagara Falls, a Seattle-to-Vancouver drive or a few days in Cancún after Florida.
• Spending most of the trip in Canada or Mexico? There are separate plans for Canada and Mexico.

Before you buy a regional plan, check every country on your route is on its list. How regional plans work.

Step 2: type of data

At 1 Mbps, maps, messages, email and music work fine, but HD video doesn't. Every plan shows its after-cap speed on the destination page before you pay. What Unlimited and Day Pass mean.

Our quick decision guide

Answer these in order, and stop at the first yes:

1. Does your home plan include the US? If yes, you may not need anything.
2. Will you cross into Canada or Mexico, even for a day? If yes, choose North America.
3. Will you use a hotspot for a laptop, or stream on the road every day? If yes, look at Unlimited or a large fixed plan.
4. Mostly maps, messages and photos, with hotel Wi-Fi at night? A fixed plan sized from the table in the next section.

How much data do you need for a trip to the USA?

As a rough guide, built from the figures below, a week of maps, messaging and some social media comes to around 3–7 GB. Video calls, streaming and hotspot use push that much higher. Your habits matter far more than the number of days.

Rough figures by activity (they vary by app, settings and network):

How that turns into a US trip:

Road trips are the big data surprise. Six hours of live navigation plus streamed music adds up, and long drives are common on US itineraries. Download playlists and offline maps on hotel Wi-Fi, and the same plan goes much further. Our guide to how much data you need goes deeper.

How to set up a US eSIM, step by step

Setup takes about ten minutes at home and two switches when you land. Doing it before you travel means you're online in the arrivals hall, not hunting for airport Wi-Fi after a long-haul flight.

Before you fly

1. Check your phone. Type *#06# into the dialler. If you see a number labelled EID, your phone supports eSIM. Or use the phone check.
2. Check it's unlocked. On iPhone: Settings → General → About → Carrier Lock should say "No SIM restrictions". On Android, ask your network if you're unsure. More on compatibility.
3. Buy your plan and install it on home Wi-Fi. On iPhone it's usually a one-tap link; on Android you scan a QR code. Guides for iPhone, Samsung and Pixel.
4. Rename the line to something like "kimsim USA", so you can tell the lines apart. How to rename it.
5. Leave the kimsim line switched off. Some eSIMs can find a network before you land, for example on a stop-over, and that would start the plan early.

When you land

1. Switch the kimsim line on and choose it for mobile data. Choosing the data line.
2. Turn Data Roaming on for the kimsim line only. Your phone sees the eSIM as a visitor on a US network, so this switch must be on. Why it matters.
3. Turn Data Roaming off on your home line. This stops your home network charging you its daily fee for data.
4. Set calls and texts to your home line, if you want to keep receiving them. Calls and texts.

Give it a minute or two and you should see signal bars and a US network name. If not, turn Airplane Mode on and off once.

Will an eSIM work everywhere in the US?

It works wherever its partner networks have signal, which covers cities, towns and most main highways. It won't conjure signal where no network reaches. Large parts of the rural West, many national parks and stretches of open highway have little or no coverage, whichever SIM you use.

National parks

National parks are where visitors most often lose signal. The National Park Service says plainly that cellular service is "extremely limited" in Yellowstone. It adds that summer crowds can overload the network that does exist, and that texting is usually the most reliable way to communicate there. At the Grand Canyon, the NPS says cellular service and Wi-Fi are limited within the park.

Before a park visit or a long drive:

• Download offline maps for the whole route in Google Maps or Apple Maps.
• Save the park in the free NPS app. The NPS says that once saved for offline use, most of the app's content works in the park and it can still show your location without signal.
• Tell someone your plan for remote hikes, and don't rely on your phone as your only safety net.

Hawaii, Alaska and islands

Both states are part of the US, so a US plan is meant to work there. Coverage away from main towns can be thin. Check the networks listed on the destination page, and plan offline for remote island roads and Alaskan drives.

Cruises from US ports

Your eSIM works while the ship is in a US port with signal. Out at sea, phones can connect to the ship's own network, which a travel eSIM doesn't cover and which your home network may bill at its own rates. Keep Data Roaming off on your home line on board, or use Airplane Mode with the ship's Wi-Fi.

Wi-Fi as a backup

Hotels, cafés and many shops offer free Wi-Fi, so you can save data for when you're out. Hotel Wi-Fi often needs a login page and can be slow in the evening, which is when an eSIM earns its keep.

Do you get a US phone number with a travel eSIM?

No. kimsim plans are data only, so you get mobile internet but no American number, calls or texts on the eSIM line. For most visitors that's fine: messaging and calling apps run over data on your usual number, and your home SIM can stay on for normal calls and texts.

What keeps working, and how:

• WhatsApp, Telegram and Signal. Nothing to change. Don't re-verify or change your number in the app. WhatsApp and iMessage.
• iMessage and FaceTime. Check your usual number is ticked under Settings → Messages → Send & Receive, and the same in FaceTime settings.
• Bank and app codes by SMS. These still arrive on your home SIM if that line is on. Your network may charge roaming rates for calls and texts, so check before you go.
• Calls home. Use WhatsApp, FaceTime or another calling app over the eSIM's data.

Occasionally a US service, such as a restaurant waitlist, wants to text a code to an American number. Your home number often works, but not always. It's rarely more than an inconvenience, and it's worth knowing before you arrive. More on keeping your number.

A worked example: London to New York, then Toronto

Suppose you're flying from London to New York for five days, then taking the train to Niagara Falls and crossing into Toronto for four more. You're on a UK plan that charges £8 a day in the US and Canada, and you use your phone for maps, messaging and photos.

Here's how we'd set it up:

1. Coverage. Two countries, so a North America plan rather than a US-only one. One eSIM covers the whole trip, including the border.
2. Data. Nine days of light-to-medium use. A fixed plan of around 10 GB gives room to spare; you can top up on the same eSIM if needed.
3. Install. At home, on Wi-Fi, a week before. Rename the line "kimsim N America" and leave it off.
4. Land at JFK. Switch the kimsim line on, set it as the data line, turn Data Roaming on for it and off on the UK line. The plan starts now, on first connection.
5. Cross the border. The phone moves to a Canadian partner network on its own, usually within a few minutes. If it doesn't, turn Airplane Mode on and off, or pick a network by hand.

Roaming at £8 a day for the same nine days would come to £72 on the UK line, by our arithmetic. With the eSIM, the UK line only connects if you let it, so that daily fee doesn't trigger from data.

Common mistakes with a US eSIM

Most US eSIM problems come from a handful of avoidable slips. Here they are, with the fix for each.

Why isn't my eSIM working in the US?

Usually it's a setting. Check that the kimsim line is on, chosen for mobile data, and that Data Roaming is on for that line. Then turn Airplane Mode on and off once. That fixes most "no service" cases straight after landing.

If that doesn't do it, work through these in order:

1. Bars but no internet. Restart the phone. If pages still won't load, check the APN settings.
2. No bars at all. Try choosing a network by hand from the plan's list, then switch back to Automatic later.
3. It installed but won't connect. Your phone may be locked to your home network. Check Carrier Lock, as above.
4. It's slow. Check whether you've used today's full-speed allowance on an Unlimited or Day Pass plan. Slow data.

If none of that works, talk to us. If your eSIM can't be activated and we can't get it working, you get a full refund under our activation guarantee. Refunds.

How we put this guide together

We checked every roaming price here on the networks' own pages on 1 November 2026: Vodafone UK, Three UK and Telstra. We also used the European Commission's roaming FAQ, the US National Park Service's park pages and Apple's eSIM support pages. Facts about kimsim plans come from our own help centre. We didn't test coverage in the parks ourselves; those descriptions are the NPS's.

kimsim sells travel eSIMs, including the US and North America plans mentioned here. Prices change often, so check your network's app before you travel.