eSIM: How it works and why you should use it
An eSIM is a digital SIM card built into your phone. Unlike a traditional SIM card, it takes up no physical space and lets you switch operators in seconds.
What exactly is an eSIM?
An eSIM is a SIM chip built directly into your phone. Unlike a traditional SIM card that you physically insert into a slot, an eSIM is soldered to your device's motherboard. It works exactly the same way: it stores your subscription information (identifier, authentication keys, contacts) and lets your phone connect to a mobile network.
The "e" stands for "embedded". You don't handle anything or insert anything. Everything happens through software.
How does an eSIM work?
Remote activation
With an eSIM, you don't need to visit a shop to buy a physical card. Activation happens entirely online via a QR code or activation link. You scan the code with your phone, confirm the action, and within seconds your eSIM is active.
Multiple profiles on one phone
One of eSIM's biggest strengths: you can store multiple profiles on your device. Say you're travelling in France, then Switzerland. You can have one eSIM profile for each country and switch between them without changing phones. Some devices even let you use two profiles at the same time (electronic dual SIM).
No physical card to lose
Since there's nothing physical to handle, you can't lose your SIM while travelling. It exists only in your phone.
Which devices support eSIM?
eSIM isn't compatible with every phone. Recent and high-end devices generally support it:
- iPhone XS and newer
- Samsung Galaxy S20 and newer
- Google Pixel 3 and newer
- Some iPad and Apple Watch models
Check your device's technical specs before buying an eSIM. Budget phones and older models often have only the traditional physical SIM slot.
eSIM vs physical SIM card: the real differences
| Feature | eSIM | Physical SIM |
|---|---|---|
| Setup | QR code, instant | SIM slot, a few seconds |
| Switching operators | A few taps | Buy + insert |
| Storage | Multiple profiles | One profile |
| Card loss | Impossible | Real risk |
| Compatibility | Recent devices | All phones |
| Cost | Usually the same | The same |
eSIM advantages when travelling
Instant activation
You land at the airport, connect to WiFi, buy a local eSIM, and 30 seconds later you have mobile data. No waiting, no queues at the operator's shop.
Save on roaming charges
If you travel regularly, eSIM lets you buy a local plan in each country instead of paying your home operator's international rates. These are often much cheaper.
Maximum flexibility
You can switch operators without changing your phone number (if you stay with the same operator in a given country). You keep your main number and can reactivate it anytime.
Zero loss risk
No tiny card to lose in transport or at your hotel. Your eSIM is secure in your phone.
If you travel often, you can keep multiple eSIM profiles for different countries and reactivate them as needed.
Limitations and things to watch for
Limited compatibility
Not all phones support eSIM. If you have an older or budget model, you're stuck with a physical SIM card.
Internet needed for activation
To activate an eSIM, you need an internet connection (WiFi or mobile data). If you arrive in a country with no immediate internet access, you'll have to wait.
Some banks and services may resist
Some banks or online services restrict account access from virtual numbers or eSIMs. Check your bank's terms before switching entirely.
Before relying entirely on an eSIM for critical services (bank access, two-factor authentication), verify that your bank and services accept eSIM numbers. Some institutions refuse connections from numbers not linked to a physical SIM card.
How to buy and activate an eSIM?
Simple steps
- Check that your phone supports eSIM
- Buy an eSIM from a provider (operator or specialist platform)
- Receive a QR code or activation link
- Open your phone's settings, go to "Add eSIM"
- Scan the QR code or enter the link
- Confirm activation
- Wait a few seconds, then activate the profile
Where to buy
You can buy an eSIM directly from:
- Your home operator (if they offer it)
- Specialist platforms offering local plans in multiple countries
- Local operators in your destination country
Prices vary by country, plan length, and included data.
eSIM and phone numbers: what you need to know
An eSIM works like a regular SIM card: it gives you a local phone number (or international depending on your plan). This number can be used to receive SMS, calls, and access the internet via mobile data.
If you need a virtual number for international calls or SMS, some platforms offer extra numbers alongside your eSIM. This lets you have a number for your home country and a local number for your destination.
If you receive OTP codes (two-factor authentication) on your eSIM, make sure your phone is secured with a PIN or biometric lock. Also protect access to your eSIM settings.
Countries where eSIM works
eSIM is now available in many countries. The widest coverage is in Europe, North America, and Asia. Before travelling, check that your destination supports eSIM and that local plans are available.
Some countries, particularly in Africa, are only beginning to adopt eSIM. In these regions, the physical SIM card remains the standard.
The future of eSIM
Phone makers are gradually dropping the physical SIM slot. Apple, Samsung, and Google are building more devices with eSIM only. Within a few years, eSIM will be the standard, and physical SIM cards will fade away.
Mobile operators are adapting too: more are offering eSIM as the default option, and some are gradually phasing out physical cards.
Three essential points to remember:
1. An eSIM is a digital SIM chip built into your phone, requiring no physical handling.
2. It offers instant activation, multiple simultaneous profiles, and maximum flexibility when travelling.
3. Before adopting eSIM for critical services (banking, authentication), verify that your institution accepts it.
Ready to try it?
ELK Connect editorial team
We write about staying reachable across borders — numbers, calls, eSIM and the money side of it. Everything published here is checked against what the platform actually does.