What is an eSIM? The Complete 2026 Guide for International Travelers

If you have traveled internationally in the past few years, you have probably heard the term “eSIM” at some point. Maybe a friend mentioned buying one before a trip to Japan, or you saw an ad in an airport. But what exactly is an eSIM, and why are millions of travelers now choosing one over a traditional SIM card?

This guide covers everything you need to know: what an eSIM is, how it works under the hood, which devices support it, how to install and activate one, and — most importantly — how to pick the right eSIM provider so you stay connected without overpaying.

What Exactly is an eSIM?

An eSIM (embedded SIM) is a small chip soldered directly onto your phone’s motherboard at the factory. It performs the same job as the plastic SIM card you are used to — it authenticates your device on a mobile network — but it does so without a removable card.

Instead of popping a tray open and swapping a tiny piece of plastic, you download a digital profile over the internet. That profile tells your phone which network to connect to, which data plan you are on, and how to route your traffic. You can store multiple profiles on one eSIM chip and switch between them in your phone’s settings.

The technology was standardized by the GSMA in 2016, first appeared in consumer smartphones with the Google Pixel 2 in 2017, and became mainstream when Apple adopted it for the iPhone XS in 2018. By 2026, virtually every flagship phone ships with eSIM support, and Apple has removed the physical SIM tray entirely from US-sold iPhone models since the iPhone 14.

How Does an eSIM Actually Work?

At the hardware level, an eSIM chip is a rewritable secure element. When you “install” an eSIM, your phone contacts a remote provisioning server operated by the carrier or eSIM provider, authenticates the request, and downloads an encrypted profile. That profile contains:

IMSI (International Mobile Subscriber Identity) — your unique subscriber ID
Ki (Authentication Key) — the secret key that proves your identity to the network
Network configuration — APN settings, roaming rules, and preferred networks

Once the profile is installed, your phone connects to the local mobile network exactly the same way a physical SIM would. The end user experience — calling, texting, browsing — is identical. The only difference is how the profile got onto your device: over the air instead of on a piece of plastic.

The Installation Process Step by Step

For travelers, the typical flow looks like this:

Choose a provider — Browse providers like Airalo, Holafly, Saily, Nomad, or others on a comparison site
Select a plan — Pick your destination country or region, data allowance, and validity period
Purchase — Pay online with a credit card, PayPal, or other payment method
Receive a QR code — The provider sends a QR code to your email or displays it in their app
Scan the QR code — Open your phone’s eSIM settings and scan the code (this requires an internet connection)
Label the plan — Give it a name like “Japan Travel” so you can identify it later
Activate at your destination — When you land, toggle the eSIM on in your settings and turn off your home SIM’s data roaming

The entire process from purchase to installation takes less than five minutes. Many travelers install their eSIM at home before departure and simply activate it when they arrive.

Which Phones Support eSIM in 2026?

eSIM support has expanded significantly. Here is a comprehensive list of supported devices.

Apple

Apple has been the most aggressive adopter of eSIM technology.

iPhone: XS, XS Max, XR, 11 series, SE (2nd & 3rd gen), 12 series, 13 series, 14 series, 15 series, 16 series — all support eSIM
iPhone 14 and later (US models): No physical SIM tray at all; eSIM only
iPhone 13 and later: Support dual eSIM (two active eSIM profiles simultaneously)
iPad: Pro (3rd gen+), Air (3rd gen+), iPad (7th gen+), Mini (5th gen+) with cellular models

Samsung

Galaxy S series: S20, S21, S22, S23, S24, S25 and their Plus/Ultra variants
Galaxy Z series: Z Fold 2 through Z Fold 6, Z Flip 3 through Z Flip 6
Galaxy Note: Note 20 and Note 20 Ultra
Galaxy A series: A54, A55 (select markets)

Google

Pixel: Pixel 2 and every Pixel since, including Pixel 9 series
Pixel 6 and later: Support dual eSIM

Other Brands

Motorola: Razr series, Edge 40 and newer
OnePlus: 12, Open
OPPO: Find X5 Pro and newer, Find N3
Sony: Xperia 1 IV, 1 V, 1 VI, 5 IV, 5 V
Xiaomi: 13 series and newer (select models)
Nothing: Phone 2, Phone 2a

How to Check Your Phone

If your phone is not on this list, the easiest way to check is:

iPhone: Go to Settings → General → About. If you see an “Available SIM” or “eSIM” section, you are good.
Android: Go to Settings → Network & Internet → SIMs. If you see “Add eSIM” or “Download SIM,” your phone supports it.
IMEI check: Dial *#06# and check if your phone shows an EID (eSIM Identifier). If it does, eSIM is supported.

Keep in mind that some carrier-locked phones may have eSIM disabled even if the hardware supports it. Contact your carrier to unlock it if needed.

eSIM vs Physical SIM: A Detailed Comparison

Understanding the differences helps you decide when an eSIM makes sense and when a physical SIM might still be the better choice.

Feature	eSIM	Physical SIM
Installation	Digital — scan a QR code	Manual — open a tray, insert a card
Setup time	Under 5 minutes, from anywhere	Requires a store visit or waiting for delivery
Multiple plans	Store 8-10+ profiles on one device	One card at a time per slot
Dual SIM	Use eSIM + physical SIM simultaneously	Need a dual-SIM phone with two slots
Risk of loss	None — embedded in the device	Can be lost, damaged, or stuck in the tray
Environmental impact	No plastic, no packaging, no shipping	Plastic card, cardboard packaging, courier fuel
Availability	Requires a compatible phone (2018+)	Works with any unlocked phone
Transferability	Usually not transferable between devices	Pop it out and put it in another phone
Airport convenience	Already installed before you land	Requires finding a SIM kiosk and waiting in line

When eSIM Wins

Short trips: You are going to Thailand for 10 days and want to be connected the moment you land
Multi-country trips: You are traveling through Europe and want one plan that covers the whole region
Frequent travelers: You take several international trips per year and want a frictionless process each time
Dual SIM needs: You want to keep your home number for calls and texts while using a local data plan

When a Physical SIM Might Be Better

Older phones: Your phone does not support eSIM
Long stays: You are moving abroad for months and want a local number with a full plan
Device swapping: You frequently switch between phones and want to move your SIM quickly
Specific local plans: Some carriers in emerging markets only sell physical SIMs with better local rates

Why eSIMs Have Become the Standard for Travel

The growth of travel eSIMs has been explosive. Here is why so many travelers have made the switch.

1. No More Airport SIM Hustles

Anyone who has landed at Bangkok’s Suvarnabhumi or Istanbul’s airport knows the drill: groggy from a long flight, you join a queue at a SIM kiosk, hand over your passport, wait for the clerk to activate the card, and hope it works. With an eSIM, you skip all of that. You install it at home, and the moment the plane touches down and you turn off airplane mode, you are online.

2. Keep Your Home Number Active

With a traditional approach, you either pay steep roaming fees or swap out your home SIM and lose access to your number. An eSIM solves this cleanly: your home SIM stays in the physical slot (or as another eSIM profile), handling calls and texts, while the travel eSIM handles data. You get the best of both worlds.

3. Instant Connectivity Matters

Modern travel depends on data. You need Google Maps to find your hotel, you need a translation app at the restaurant, you need to pull up your booking confirmation at check-in. Being offline for even 30 minutes after landing can be stressful. eSIMs eliminate that gap entirely.

4. Cost Transparency

Travel eSIM providers publish their prices online. You can compare a 5GB Japan plan across Airalo, Saily, and Nomad before you buy. There is no haggling with an airport vendor, no confusing local-language signage, and no hidden fees. What you see online is what you pay.

5. Regional and Global Plans

Some eSIM providers offer plans that cover entire regions — Europe, Southeast Asia, or even the whole world. If you are doing a multi-country trip, one regional eSIM plan can replace buying separate SIMs in each country. This saves both money and hassle.

How to Choose the Right eSIM Provider

Not all eSIM providers are created equal. Here are the factors that matter most.

Coverage

The most important question: does the provider cover your destination? Most major providers cover 100+ countries, but coverage depth varies. Some providers partner with premium local networks (like Docomo in Japan or Vodafone in Europe), while others use budget MVNOs. Check which local network the eSIM connects to, not just whether the country is listed.

Data Allowance and Type

eSIM plans come in two flavors:

Capped data: You get a fixed amount (1GB, 3GB, 5GB, 10GB, 20GB). Once you use it up, you are offline unless you top up. Best for budget-conscious travelers or short trips.
Unlimited data: True unlimited usage, sometimes with fair-use throttling after a certain amount (e.g., full speed for 1GB/day, then reduced speed). Best for heavy users, digital nomads, or anyone who does not want to worry about data budgets.

Providers like Airalo, Saily, and Nomad primarily offer capped plans, while Holafly and Maya Mobile specialize in unlimited data.

Price

Compare the price per GB for capped plans, or the daily cost for unlimited plans. A plan that looks cheap at first glance might offer poor value if the data allowance is low. Conversely, an unlimited plan might be overkill if you only need data for maps and messaging.

Validity Period

Plans range from 1 day to 30 days or more. Match the validity to your trip length. Buying a 30-day plan for a 5-day trip wastes money. Some providers let you choose the exact validity, while others offer fixed tiers (7 days, 15 days, 30 days).

Reviews and Reliability

Check what actual users say. A provider might offer great prices but have terrible customer support or unreliable connections. Look at ratings across multiple platforms — Trustpilot, App Store, and Google Play — for a balanced picture. A provider with 100,000+ reviews and a 4.0+ average across platforms is generally trustworthy.

Customer Support

Things can go wrong: an eSIM might not activate, you might get a weaker-than-expected signal, or you might need to change your plan mid-trip. Providers with 24/7 live chat support (like Airalo and Holafly) give you a safety net. Others rely on email-only support, which can leave you waiting hours.

App Quality

Most eSIM providers have companion apps that handle purchase, installation, and data monitoring. A well-designed app makes the whole process smooth. A buggy app turns a 5-minute setup into a frustrating 30-minute ordeal. Check the app’s rating in your app store before committing.

Use Best eSIM’s comparison tool to compare all these factors across 9+ providers for your specific destination.

How to Install an eSIM: Detailed Walkthrough

On iPhone

Open Settings → Cellular (or Mobile Data)
Tap Add eSIM or Add Cellular Plan
Choose Use QR Code
Point your camera at the QR code from your eSIM provider
Tap Add Cellular Plan when the profile is detected
Label the plan (e.g., “Thailand Data”)
Choose whether this plan should be your default for data, calls, or both
For a travel data eSIM, set it as the data line and keep your home SIM as the voice line

On Samsung Galaxy

Open Settings → Connections → SIM Manager
Tap Add eSIM
Choose Scan QR code from service provider
Scan the QR code
Follow the prompts to download and activate the profile
Set the eSIM as your data SIM in the SIM Manager

On Google Pixel

Open Settings → Network & Internet → SIMs
Tap Add (or the + icon)
Choose Download a SIM instead?
Scan the QR code
Confirm and activate the profile

Important Tips

You need internet to install: Make sure you are connected to Wi-Fi or mobile data before scanning the QR code. Do this at home or at the airport before departure.
Do not delete the profile accidentally: Once installed, the profile stays on your phone until you manually remove it. Some eSIMs are one-time-use; if you delete them, you cannot reinstall them.
Turn off data roaming on your home SIM: After activating the travel eSIM, make sure your home SIM’s data roaming is off. Otherwise your phone might route data through your expensive home carrier instead of the travel eSIM.
Restart if needed: Some phones need a restart after installing an eSIM for it to work properly.

Common eSIM Questions Answered

Can I use an eSIM and a physical SIM at the same time?

Yes. Most modern phones support dual SIM — one physical SIM and one eSIM active simultaneously. This is the ideal setup for travelers: keep your home SIM in the physical slot for calls and texts, and use the eSIM for cheap local data. iPhones from the 13 onward even support two active eSIM profiles at once, meaning you can go fully digital.

Do I need Wi-Fi to install an eSIM?

You need an internet connection of some kind — Wi-Fi or existing mobile data. Most travelers install their eSIM at home over Wi-Fi before departure. If you forgot, airport Wi-Fi works too, though it can be slow. Some providers like Airalo also support installation through their app, which can be slightly smoother than the QR code method.

Can I reuse an eSIM on another trip?

It depends on the provider. Some eSIMs are single-use: once the data is consumed or the validity expires, the profile is dead. Others allow you to top up data and extend validity without reinstalling. A few providers keep your profile active indefinitely and let you buy new data whenever you need it. Check the provider’s policy before purchasing.

Is an eSIM secure?

eSIMs are actually more secure than physical SIMs in several ways. The profile is encrypted and stored in a secure element on the chip. It cannot be physically removed, copied, or cloned the way a plastic SIM can. Remote provisioning uses mutual authentication between your device and the carrier’s server. The only risk is the same as any other account: if someone gains access to your eSIM provider account, they could potentially manage your profiles.

What happens if I switch phones?

Most eSIM profiles are tied to a specific device and cannot be transferred directly. If you get a new phone, you will typically need to contact your eSIM provider to re-issue the profile or purchase a new one. Some providers (like Airalo via their app) make this process straightforward. This is one area where physical SIMs still have an advantage — you can simply move the card to your new phone.

Can I get a phone number with a travel eSIM?

Most travel eSIMs are data-only plans. They provide internet access but not a local phone number for calls and texts. This is fine for most travelers who use WhatsApp, iMessage, or other internet-based messaging. If you need a local number for receiving SMS verifications or making local calls, look for providers that specifically offer voice + data plans, or use a VoIP app.

What if the eSIM does not work?

First, restart your phone. Then check that the eSIM profile is enabled in your settings and set as the active data line. Make sure data roaming is turned on for the eSIM profile (not your home SIM). Check that you are within the plan’s validity period and have not exhausted your data. If nothing works, contact the provider’s customer support. Reputable providers offer live chat and can often resolve issues within minutes.

The Future of eSIMs

The trajectory is clear: eSIMs are replacing physical SIMs. Apple has already gone eSIM-only for US iPhones, and other markets will likely follow. Samsung, Google, and other manufacturers are expected to phase out physical SIM trays in the coming years.

For travelers, this means the ecosystem will only improve. More providers will enter the market, prices will continue to drop, coverage will expand, and the installation process will become even more seamless. iSIM — the next evolution, where the SIM function is integrated directly into the phone’s main processor — is already in development and will make connectivity even more effortless.

If you have not tried a travel eSIM yet, your next trip is the perfect time to start. Compare providers for your destination using our free comparison tool and see exactly what is available, how much it costs, and what other travelers think of each option.