What is an eSIM? It is a SIM card that is built into your phone instead of being a small piece of plastic you slide into a tray. It does the same job as a regular SIM: it connects you to a mobile network. The difference is that you download it, usually by scanning a QR code, so you can switch plans without ever touching a SIM card.
For travelers, that changes a lot. You can buy data for your next destination from your sofa, install it in a couple of minutes, and be online the moment your plane lands. Here is how eSIMs work, how they compare to physical SIMs, and when they make the most sense.
In this guide:
- What is an eSIM?
- eSIM vs. physical SIM
- How does an eSIM work?
- Benefits of an eSIM for travel
- Who uses eSIMs?
- What an eSIM can't do
- FAQs
What Is an eSIM?
eSIM stands for "embedded SIM". It is a tiny chip soldered onto your phone's circuit board during manufacturing. Like a regular SIM, it stores the details that identify you to a mobile network. Unlike a regular SIM, it is rewritable, so you can load a new plan onto it digitally whenever you like.
The information a carrier loads onto the chip is called an eSIM profile. Most phones can store several profiles at once and switch between them in settings, a bit like having a drawer full of SIM cards without the drawer.
eSIM vs. Physical SIM: What's the Difference?
| eSIM | Physical SIM | |
|---|---|---|
| Form | Chip built into the phone | Removable plastic card |
| How you get it | Download by QR code, in minutes | Buy in a shop or wait for delivery |
| Switching plans | In settings, no tools needed | Swap cards with a SIM pin |
| Can it be lost or damaged? | No, it stays inside the phone | Yes, easy to lose while traveling |
| Plans stored | Several on most phones | One per SIM slot |
Most eSIM phones also keep a regular SIM slot, so you can use both together. Here is how to use an eSIM and a physical SIM at the same time, or read our full eSIM vs. physical SIM comparison.
How Does an eSIM Work?
Every eSIM-compatible phone has a unique ID called an EID. When you buy an eSIM plan, the provider creates a profile for it and sends you a QR code. Scanning that code tells your phone where to download the profile securely. Once it is installed, the phone treats it like a new SIM card.
With egoViet, the whole process looks like this:
-
Check your phone. It must support eSIM and be carrier-unlocked. Dial
*#06#: if you see an EID, you are good to go. - Choose a plan for your destination in the egoViet eSIM store, by country or by region.
- Get your QR code by email. It usually arrives within a few minutes of payment.
- Install it on Wi-Fi. Scan the QR code in your phone settings. Our installation guide shows every step.
- Switch it on when you land. On most egoViet plans, the validity period starts when your phone connects to a network at your destination. Check the plan details to be sure.
Benefits of an eSIM for Travel
No SIM shop, no airport queue
You arrive already connected. That means you can order a ride, message your hotel, or check the train times before you have even reached baggage claim.
Local prices instead of roaming fees
Travel eSIMs are prepaid, so you know exactly what you are paying before you leave. There are no surprise roaming bills when you get home. Read our tips on avoiding roaming charges for more.
Keep your own number
Your regular SIM stays in the phone, so calls and texts to your usual number still reach you while the eSIM handles data. Most travel eSIMs, including egoViet's, are data-only. Here is what that means for calls and texts.
One plan for several countries
Regional eSIMs cover a whole route with one install, which is handy for trips like Bangkok, Hanoi, and Bali, or a rail trip across Europe. egoViet has country plans for more than 150 destinations, plus regional plans for Asia, Southeast Asia, Europe, South America, and the Middle East and North Africa.
Nothing to lose
No tiny card to drop on a plane tray table, and no need to keep your home SIM safe in a wallet for two weeks.
Who Uses eSIMs?
- Vacationers who want data from the moment they land, for maps, rides, and translations.
- Business travelers who hop between countries and need a reliable connection for calls and email.
- Digital nomads who use their phone as a hotspot when café Wi-Fi lets them down.
- Students and long-stay visitors who want to stay online during the first weeks before setting up a local plan.
What an eSIM Can't Do
eSIMs are great, but there are a few things to know before you buy:
- Your phone must support it. Most phones released since 2018 do, but some regional versions don't. Check our list of eSIM-compatible devices.
- Your phone must be unlocked. A phone locked to one carrier won't accept another provider's eSIM.
- You need internet to install it. Set it up at home or at your hotel on Wi-Fi, not at the arrivals gate.
- Data-only plans don't come with a number. Use WhatsApp, FaceTime, or similar apps for calls. Here is how to make calls with a data-only eSIM.
Try an eSIM on Your Next Trip
An eSIM is the simplest way to get online abroad: no shops, no swapping cards, and no roaming bill. Pick your destination in the egoViet eSIM store, install your plan before you fly, and you are connected as soon as you land.
FAQs: What Is an eSIM?
What does eSIM stand for?
eSIM stands for "embedded SIM". It is a SIM chip built into your device that can be programmed with a mobile plan digitally, instead of using a removable SIM card.
Is an eSIM better than a physical SIM?
For travel, usually yes. You can buy and install an eSIM before you leave, keep your home SIM in the phone, and avoid SIM shops. A physical SIM still makes sense if your phone doesn't support eSIM.
Can I use an eSIM and a physical SIM at the same time?
Yes, on most dual SIM phones. A common setup is to keep your home SIM for calls and texts while the eSIM provides mobile data abroad.
Do I need Wi-Fi to install an eSIM?
Yes. Your phone needs an internet connection to download the eSIM profile, so install it on a stable Wi-Fi network before your trip.