How to use an eSIM for international travel, step by step

Going abroad from the U.S.? Learn how to check your phone, pick a plan, install a travel eSIM before you fly, and fix the most common problems on arrival.

Landing in a new country and having your phone just work is the main reason travelers switch to eSIMs: no SIM card shop, no tiny ejector tool and no surprise roaming bill. If you've never set one up, this guide shows you how to use an eSIM for international travel from start to finish, from checking your phone at home to getting online when you land.

This guide explains how to use an eSIM for travel without the guesswork:

what a travel eSIM is;
how to check your phone;
how to choose a plan;
when to install it;
what to switch on at arrivals;
how to fix the problems first-timers usually hit.

Settings and menu names vary by phone model, software version and eSIM provider. The steps below are a reliable starting point, but always follow the on-screen prompts on your own device.

How does a travel eSIM work?

A travel eSIM is a digital SIM profile you download to your phone. It adds a second line that connects to mobile networks in the countries you visit.

Before you work out how to use an eSIM for travel, it helps to know what's happening inside your phone. Most recent phones have a built-in chip that can store more than one SIM profile. When you buy a travel eSIM, you get a QR code or link that installs a new profile on that chip. Your regular U.S. line stays on the phone, so you can switch between the two.

When you arrive abroad, your phone uses the travel eSIM to connect to a partner network in that country. A multi-country eSIM can keep you connected as you cross borders. Anon eSIM, for example, is one global profile that works in 200+ countries and selects a network automatically as you move.

Many travel eSIMs are built for mobile data rather than calls and texts. Check what your plan includes before you rely on it for phone calls.

Step 1: Check that your phone is unlocked and supports eSIM

Your phone needs eSIM hardware and must not be locked to your U.S. carrier. Otherwise it will refuse a travel eSIM from another provider.

Check eSIM support.

Dial *#06#. If you see an EID number listed alongside your IMEI, your phone has an eSIM chip.
On an iPhone, an "Add eSIM" or "Add Cellular Plan" option under Settings > Cellular is another good sign.

Anon eSIM supports:

iPhones with eSIM (XS/XR and newer) on iOS 12.1 or later;
Android 10 or later on phones with eSIM hardware, such as Pixel 3 and newer or Galaxy S20 and newer.

See the full list on our compatible devices page.

Check that it's unlocked.

On an iPhone, go to Settings > General > About and look at Carrier Lock. "No SIM restrictions" means the phone is unlocked.
On Android, the wording varies. If you're unsure, ask your carrier.

If it's locked, only your carrier can unlock it. Carriers usually unlock phones once they're paid off, but it can take a few days, so ask well before your trip.

Step 2: Choose a plan that fits your trip

Pick a plan that covers every country on your route, gives you enough data, and won't expire before you're done.

Here's what to compare before you buy:

Coverage: Is every country you'll visit included, including layover countries if you'll use data there?
Data allowance: Is it a fixed bundle (for example, a set number of gigabytes) or pay-as-you-go?
Validity: Does the plan expire after a set number of days, or does unused credit carry over?
Hotspot (tethering): Can you share your connection with a laptop or a travel companion?
Calls and texts: Does the plan include a phone number, or is it data only?

Not sure how much data you'll need? Most people use more on maps, video calls and social media, and less if their hotel Wi-Fi is good. Our guide to how much mobile data a trip actually uses breaks it down by activity.

How Anon eSIM handles this:

Pay-as-you-go: you pay for the data you use, at each country's rate. Rates differ by country, so check your destinations on the rates page.
Balance: your USD balance never expires, so leftover credit is still there for your next trip.
Hotspot: included on every plan.

Step 3: Buy and install your eSIM before you leave

Buy and install the eSIM at home while you're on reliable Wi-Fi, so you're not troubleshooting in an airport.

Installing an eSIM needs an internet connection to download the profile, and your home Wi-Fi is the easiest place to do it.

On an iPhone:

When you receive a QR code, scan it with the Camera app and tap the Cellular Plan Detected notification. Then follow the prompts to add the plan.
On recent iOS versions, you can also tap and hold a QR code shown in an email or on a web page, then choose Add eSIM.
If you have an activation code instead, go to Settings > Cellular > Add Cellular Plan > Enter Details Manually.

On a Google Pixel:

Go to Settings > Network & internet > SIMs > Add SIM, then follow the on-screen steps to set up an eSIM.

On a Samsung Galaxy:

Go to Settings > Connections > SIM card manager > Add mobile plan > Add using QR code, then scan the code.

After installing:

Give the new line a clear label, such as "Travel", so you can tell it apart from your U.S. line.
Don't delete the eSIM if something looks wrong, because many eSIMs can only be installed once.

With Anon eSIM, the QR code appears right after you pay, and there's no app to download. For Anon's exact steps, see how Anon eSIM works, or follow the iPhone install guide.

When should you buy and install it?

Ideally a few days before you fly. That leaves time to fix any problems, and you can switch the line on when you land.

Some bundle plans start their countdown as soon as they connect to a network abroad, while others start at purchase. Check your provider's terms before installing early.

Pay-as-you-go plans that don't expire remove that worry. You can install weeks ahead, and nothing is used until you start using data.

Step 4: How to use an eSIM for international travel once you land

Set the travel eSIM as your mobile data line and turn on data roaming for that line only.

This is the step most first-time users miss. A travel eSIM usually connects as a roaming line, so it needs data roaming switched on to work.

On an iPhone:

Go to Settings > Cellular > Cellular Data and choose your travel line.
Then tap the travel line under Settings > Cellular and turn on Data Roaming for that line.
Recent iOS versions may also ask whether you plan to use a newly added eSIM at home or while you travel.

On Android:

Look under Settings > Network & internet > SIMs (Pixel) or SIM card manager (Samsung) to choose which SIM handles mobile data.
Turn on roaming for the travel SIM.

To avoid charges from your U.S. carrier, keep data roaming off on your home line. You can keep that line switched on for calls and texts. Your carrier may still charge you if you answer calls or send texts on it abroad, so check its international rates.

Step 5: How to use an eSIM for travel when something goes wrong

Most "it's not working" moments come down to one of five settings.

No data on arrival: Check that the travel eSIM is selected for mobile data and that data roaming is on for that line. Then turn Airplane Mode on and off.
The phone won't add the eSIM: Your phone may be carrier-locked, or it may not support eSIM. See Step 1.
Data is very slow or keeps dropping: Move to a spot with a better signal, or restart your phone so it searches for networks again.
Unexpected charges from your U.S. carrier: Your home line may still be using data. Set mobile data to the travel line and turn off roaming on the home line.
Hotspot isn't sharing data: Check whether your plan allows tethering.

If none of that helps, contact your eSIM provider's support before deleting anything.

With Anon eSIM:

data simply stops when your balance reaches zero, with no overage charges;
topping up from $5 brings it back without reinstalling anything.

Frequently asked questions

Will I keep my U.S. phone number? Yes. Installing a travel eSIM doesn't remove your U.S. line. It stays on your phone, and you can keep it switched on for calls and texts while the travel eSIM handles data. Calls and texts on your U.S. line abroad may be billed by your carrier.

Can I use one eSIM for several countries? Yes, if you choose a multi-country or global eSIM. Check that every country on your route is covered. Anon eSIM covers 200+ countries on one profile.

Is a travel eSIM cheaper than my carrier's international plan? Often, especially if you'll be away for more than a few days. It depends on your carrier, destination and data use. We compare the two in eSIM vs roaming.

Do I need to give my name or ID to buy a travel eSIM? It depends on the provider. Anon eSIM doesn't ask for ID, an account or an email at checkout. Your card provider or crypto payment method may still process your payment details. Your phone and the local mobile network still see device and network data, such as your device's IMEI and the cell towers you connect to.

Do you buy an eSIM before you travel? Yes, ideally. You need an internet connection to download the profile, and fixing problems is much easier at home than at arrivals. If you're still working out how to use an eSIM for travel, installing it a few days early gives you time to check every setting before you fly.

The bottom line

If you're deciding how to use an eSIM for international travel, the simplest path is to check that your phone is unlocked and eSIM-capable, install the eSIM at home, and switch it on for data when you land. Keep roaming off on your U.S. line, and you'll avoid surprise charges.

Ready for your next trip? If you'd like a travel eSIM that works in 200+ countries and keeps your unused credit for next time, take a look at Anon eSIM. Check your phone's compatibility first, then set it up at home before you go.