What is eSIM and how it works – full explanation
Author: Skyalo Team • Updated: September 1, 2025 at 10:32 AM
You've probably heard about eSIM — the next generation of mobile technology. But what is it exactly? And how is it different from a regular SIM card?
In this guide, we’ll break down everything you need to know about eSIM: how it works, what phones support it, and how you can activate one in just a few minutes.
🔹 What Is an eSIM?
eSIM stands for Embedded SIM. It’s a small chip built directly into your phone, tablet, or smartwatch that works just like a traditional SIM card — but without the physical card.
With eSIM, you don’t need to visit a store or wait for delivery. You can download and activate your mobile profile online, instantly.
🔹 How Does eSIM Work?
- Your phone has a tiny embedded chip (eSIM).
- You scan a QR code or install a mobile profile online.
- You connect to the mobile network — no card slot required.
🔹 eSIM vs Regular SIM: What’s the Difference?
Feature | Physical SIM | eSIM |
|---|---|---|
Form | Removable card | Embedded in device |
Activation | Needs manual insertion | Done online in minutes |
Risk of loss | Can be lost/stolen | Secure and internal |
Dual SIM Support | Often limited | eSIM + physical SIM possible |
Convenience | Depends on carrier | Instant setup from anywhere |
🔹 Which Devices Support eSIM?
Here’s a list of the most common phones and devices that support eSIM:
- iPhone XR and newer
- Samsung Galaxy S20 and newer
- Google Pixel 3 and newer
- Huawei, Oppo, Xiaomi (newer models)
- iPads, Apple Watch, some Lenovo/HP laptops
🔹 Benefits of Using eSIM
- ✅ Instant activation — no physical store visits
- ✅ No plastic cards to lose or damage
- ✅ Switch between carriers or countries with ease
- ✅ Store multiple profiles on one device
- ✅ Eco-friendly and secure
🔹 Are There Any Downsides?
Let’s be honest — while eSIM is the future, there are still a few limitations:
- Not all carriers support eSIM (yet)
- Some older phones don’t have eSIM hardware
- Requires Wi-Fi for initial activation
🔹 How to Get an eSIM with Skyalo
Skyalo makes getting an eSIM for international travel simple:
- Choose your destination and data plan
- Pay online with card or Apple Pay
- Activate via QR code or manually
🔹 FAQ
Can I use eSIM and a regular SIM together?
Yes! Many phones support Dual SIM functionality.
Do I need internet to activate eSIM?
Yes, you’ll need Wi-Fi or any data connection to download the profile.
Can I install multiple eSIMs?
Yes. Most phones support up to 5 eSIM profiles, but only one or two can be active at a time.
🔹 Conclusion
eSIM is changing the way we connect to mobile networks. It’s fast, secure, and built for the digital age. Whether you're a traveler, a digital nomad, or just want more flexibility, eSIM is the way forward.