What an eSIM Card Is and Why Travellers Use One
An eSIM is a digital SIM built into your phone that lets you download a mobile plan without swapping plastic cards. For travellers, it means mobile data abroad without hunting for a shop or paying roaming fees.
One eSIM app for 196 countries
- Country, regional and global data plans
- Install by QR code, no physical SIM
- Keep your own number for calls and WhatsApp
Scan with your phone camera to open the app
eSIM meaning: an embedded SIM explained in plain words
An eSIM is an embedded SIM: a tiny chip soldered directly onto your phone's circuit board during manufacturing. Unlike the removable plastic cards you slide into a tray, this chip stays put. You can't pull it out, and you don't need to.
The technical term is eUICC - embedded Universal Integrated Circuit Card. The 'universal' part matters: the same chip can host profiles from different carriers. When you buy a plan, the carrier sends a digital profile over the air. Your phone writes that profile to the eUICC chip, and suddenly you're on their network.
Think of the chip as an empty container. A profile is the data that fills it: your phone number (if it's a primary line), network credentials, and the carrier's settings. With a physical SIM, that data is burned onto plastic at the factory. With an eSIM, the data arrives as a download.
Most phones since 2018 - iPhone XS and later, recent Samsung Galaxy and Google Pixel models, many others - carry this chip. Some devices support only eSIM; the iPhone 14 sold in the United States has no SIM tray at all. Others run dual SIM: your home carrier stays on a physical card, and a travel eSIM runs in parallel.
For travellers, the shift from plastic to profile changes how you connect. Instead of finding a mobile shop in Japan or Mexico, you install a data plan before you board. The profile downloads over Wi-Fi, activates when you land, and your phone joins a local network without a visit to a store.
eSIM card vs SIM card: what actually changed
The words 'eSIM card' are a contradiction - there is no card - but people use the phrase because it maps to what they know. Here's what differs from a physical SIM and what stayed the same.
| Attribute | Physical SIM | eSIM |
|---|---|---|
| Form | Removable plastic chip | Soldered circuit on logic board |
| How you get it | Shop visit, postal delivery, vending machine | QR code, app download, manual entry |
| Swapping carriers | Eject tray, replace card | Delete old profile, download new one |
| Number of profiles | One per card | Multiple stored, one or two active |
| Security | Physical theft possible | Remote lock, harder to clone |
| Network function | Authenticates you to the carrier | Authenticates you to the carrier |
Both types do the same job: they prove to a cell tower that you're allowed on the network. The difference is delivery. A plastic SIM ships in an envelope; an eSIM profile ships as a few kilobytes of encrypted data.
When you travel to Italy with a physical SIM, you buy a TIM or Vodafone card at the airport, swap it in, and your home SIM goes into a drawer until you return. With an eSIM, your home line stays active in the background. You download a travel data profile, set it as your data line, and both run at once. Calls to your home number still reach you; data flows through the travel profile.
One practical win: you can store several profiles. If you visit India twice a year, the Airtel or Jio eSIM sits dormant between trips. Next time you land in Delhi, you turn it back on instead of buying another card.
How an eSIM profile gets onto your phone
Three methods exist, and the provider decides which one you'll use. All three require a Wi-Fi connection; you cannot download a profile over mobile data from another carrier.
QR code activation
The carrier emails or displays a QR code. On iPhone, you open Settings > Cellular > Add eSIM and scan the code with your camera. Android paths vary - Samsung uses Settings > Connections > SIM card manager - but the scan step is the same. The phone fetches the profile from the carrier's server and installs it in seconds.
Carrier app
Some providers, including the eSIM app we use, let you browse plans and install profiles without leaving the app. You choose a destination, pay, and tap 'Install'. The app talks to the eUICC chip directly. No QR, no manual codes. This method is faster when you're buying plans for multiple countries.
Manual entry
If the QR won't scan, you can type the activation code by hand: a long string starting with 'LPA:'. You also enter the carrier's SM-DP+ address. It's tedious, but it works when a printed code is smudged or a screenshot won't focus.
Whichever route you take, the profile lands on your phone before you travel. At the airport or in the air, the eSIM is already there. When you touch down and turn off airplane mode, the phone sees the local network and connects.
What an eSIM can and cannot do when you travel
Travel eSIMs are data-only. That detail surprises people who assume a SIM always includes a phone number you can call or text. Here's what you actually get.
Mobile data: The eSIM profile connects you to a local network - often the same one a physical tourist SIM would use. You choose a plan by data allowance or day count, download the profile, and the phone treats that line as its data source. Apps, maps, messaging all flow through the travel profile.
Voice calls: No traditional phone number comes with the profile. To call a hotel or a restaurant, you use WhatsApp, Telegram, FaceTime Audio, or a similar internet-based service. The person you're calling needs the same app, or you pay for a VoIP service that bridges to regular phone lines.
Your existing number: If you're running dual SIM, your home SIM stays in the phone (either physical or a separate eSIM profile). Calls and SMS to your real number still arrive. You just pay your home carrier's roaming rate for those voice minutes, which is why most travellers let calls go to voicemail and reply on WhatsApp.
Some people ask if the eSIM 'replaces' their main line. It doesn't. You're adding a second line for data. Your original number, contacts, and iMessage or RCS threads stay tied to the home SIM. The travel eSIM is a pipe for internet traffic, not a new identity.
One more constraint: the plan's validity period starts the moment your phone registers on the network, not when you buy it. If you activate a seven-day eSIM on Monday morning, it expires the following Monday. Check the plan page for details on any grace periods or activation windows.
Who supports eSIM technology today
Three groups need to agree before an eSIM works: your phone, the network in the country you're visiting, and the provider that sells you the profile.
Phones: Apple adopted eSIM with the iPhone XS in 2018. Every model since then has the chip, and the US iPhone 14 and 15 lineups dropped the physical tray entirely. Samsung added eSIM to the Galaxy S20, and most flagship Android phones - Google Pixel, high-end Motorola and Oppo devices - followed. Budget models often lack the chip; you'll need to check compatibility before you buy a plan.
Carriers: In United Kingdom, EE, Vodafone, and O2 sell eSIM plans to residents. In the United States, T-Mobile, Verizon, and AT&T do the same. Most large carriers worldwide support eSIM for their own customers, but tourist short-term plans are another story. That's where travel providers come in.
Travel providers: We use an eSIM app that partners with local networks across more than 200 destinations. The app buys wholesale data from carriers, packages it into tourist-friendly plans, and delivers profiles you can install in two minutes. Other models exist - some MVNOs offer eSIM, some regional operators sell direct - but an aggregator app solves the 'one profile per country' problem if you're visiting several places.
One technical note: your phone must be carrier-unlocked. If you're still paying off a device through a US carrier or bought a phone on contract, it might be locked to that network. An unlocked phone accepts any SIM, physical or embedded. Call your carrier or check the settings menu to confirm status before you travel.
Common misconceptions about eSIM
'eSIM' means a specific company
eSIM is a technology standard, not a brand. Dozens of carriers and app-based providers sell eSIM profiles. The chip in your phone doesn't belong to any one company; it's a blank slate that accepts profiles from anyone.
You can only have one eSIM at a time
Most phones store multiple profiles. iPhones hold eight or more; you just toggle which one is active. Android limits vary by manufacturer, but two to five is common. You can keep a profile for Europe, another for Asia, and switch between them in settings.
eSIM plans cost more than physical SIM cards
Prices depend on the provider and the country. In some markets a local SIM from a corner shop runs cheaper; in others a travel eSIM undercuts airport kiosks. The convenience premium exists, but it's smaller than most people assume.
You need a new eSIM for every trip
If the old profile hasn't expired and still has data, you can reuse it. Regional plans covering multiple countries let you visit several places on one profile. Single-country profiles sit dormant until your next visit, as long as the validity window hasn't closed.
eSIM gives you a local phone number
Travel eSIMs are data-only. You get internet access, not a number people can dial. For voice, you'll use your existing number on the home SIM or switch to app-based calling.
Installing an eSIM deletes your current plan
Adding a travel eSIM doesn't touch your primary line. Both profiles coexist. You choose which one handles calls, which one handles data, and which one handles SMS in your phone's dual-SIM settings.
Frequently asked questions
What is eSIM on iPhone and how do I know if my iPhone has it?
eSIM on iPhone is the embedded SIM chip that lets you download carrier profiles without a physical card. Any iPhone from XS onward has the chip. To check, open Settings > Cellular (or Mobile Data); if you see 'Add eSIM' or 'Add Cellular Plan', your device supports it. US models of iPhone 14 and 15 have only eSIM - no SIM tray at all.
What does eSIM mean in simple terms?
eSIM means embedded SIM. Instead of a removable plastic card, the SIM is a chip soldered into your phone. You download a mobile plan as a digital profile over Wi-Fi. It does the same job as a physical SIM - connecting you to a network - but you never touch or swap any hardware.
Is an eSIM a physical card I need to carry?
No. An eSIM is a chip built into the phone during manufacturing. You receive an activation code or QR, not a plastic card. Once you install the profile, the data sits in the chip and you can delete the email or screenshot.
Can I have both a physical SIM and an eSIM active at the same time?
Yes. Most dual-SIM phones let you run a physical SIM and an eSIM profile simultaneously. You assign one line for calls and the other for data in settings. Travellers typically leave their home SIM in the tray for calls and use a travel eSIM for mobile data.
Does using an eSIM cost extra money beyond the plan price?
No hidden fees exist for the eSIM technology itself. You pay for the data plan - the same way you'd pay for a physical SIM card. Activation and profile downloads are part of the service. Your phone does not charge you for having an eSIM chip.
Is eSIM secure or can someone steal my profile remotely?
eSIM profiles use encrypted delivery and are tied to your device's unique identifier. A remote attacker cannot clone the profile without physical access to your phone. In fact, eSIM reduces one risk: no one can pull a card from your phone while you're not looking. If your phone is stolen, you can lock or delete the eSIM profile remotely through your carrier or the provider's app.
Can an eSIM be hacked more easily than a physical SIM?
No. Both eSIM and physical SIM rely on the same authentication protocols. The profile itself is encrypted. The main attack vector - SIM swapping, where someone convinces your carrier to transfer your number - exists for both technologies and depends on carrier security, not the form factor. An embedded chip actually makes physical theft harder, since the SIM cannot be removed and inserted into another device.
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