How Does an eSIM Work?
An eSIM (embedded SIM) is a digital SIM that lets you activate a mobile data plan without a physical SIM card. It is built into your phone and can be programmed with a data plan from any compatible provider. Here is everything you need to know.
What is an eSIM?
An eSIM is a small chip embedded directly in your phone during manufacturing. Unlike a traditional SIM card that you insert and remove, an eSIM is permanently part of your device. You activate it by downloading a digital profile, usually by scanning a QR code.
Think of it like this: a physical SIM is like a DVD you put in a player. An eSIM is like Netflix — the content is delivered digitally, with no physical object needed.
Most phones released since 2020 support eSIM, including all iPhones from iPhone XR onwards, Samsung Galaxy S20 and newer, and Google Pixel 3 and newer.
How to Set Up an eSIM in 3 Steps
Buy an eSIM Plan
Choose a provider and purchase a plan for your destination. You can do this from the provider's website or app. Most providers let you buy days or weeks before your trip, so you can have everything ready before you leave.
We recommend comparing prices on our destination pages first to find the best deal.
Install the eSIM Profile
After purchasing, you will receive a QR code (via email or in the provider's app). On your phone, go to Settings and look for the eSIM or mobile data section:
- iPhone: Settings > Mobile Data > Add eSIM > Use QR Code
- Android: Settings > Network > SIMs > Add eSIM > Scan QR code
Scan the QR code and the eSIM profile will download to your phone. This takes about 30 seconds. You need a Wi-Fi connection for this step.
Activate at Your Destination
Most travel eSIMs activate when you arrive at your destination and connect to a local network. Some activate immediately after installation. Check your provider's instructions for specifics.
Once activated, your phone will use the eSIM for data while your regular SIM stays active for calls and texts from home.
eSIM vs Physical SIM Card
| Feature | eSIM | Physical SIM |
|---|---|---|
| Setup Time | 5 minutes (from anywhere) | 15-60 min (find a shop, queue) |
| Convenience | Buy and install before your trip | Buy at airport or local shop |
| Keep Your Number | Yes, use both SIMs simultaneously | Need to swap SIMs |
| Risk of Loss | None (digital) | Can lose the tiny card |
| Price | Competitive, often cheaper | Varies by country |
| Top Up | Instantly via app | Visit a shop or use vouchers |
Is My Phone eSIM Compatible?
Most modern smartphones support eSIM. Here are the most common compatible devices:
Apple
- iPhone XR, XS, XS Max and all newer models
- iPad Pro (3rd generation and later), iPad Air (3rd generation and later)
- Apple Watch Series 3 and later (cellular models)
Samsung
- Galaxy S20, S21, S22, S23, S24, S25 series
- Galaxy Z Flip and Z Fold series
- Galaxy Note 20 and later
- Pixel 3 and all newer Pixel phones
Other Brands
- Xiaomi 12T Pro and select newer models
- Oppo Find X3 Pro and select newer models
- Motorola Razr series
To check if your specific phone supports eSIM, look in your phone's settings for "eSIM" or "Add Mobile Plan" options.
Frequently Asked Questions
Do I need Wi-Fi to install an eSIM?
Yes, you need an internet connection (Wi-Fi or mobile data) to download and install the eSIM profile. This is why we recommend installing your eSIM at home or your hotel before you leave, while you still have Wi-Fi access.
Can I have more than one eSIM on my phone?
Yes, most phones can store multiple eSIM profiles. However, you can typically only have one active at a time (alongside your physical SIM). This is useful if you travel to different countries regularly — you can keep old eSIM profiles and reactivate them later.
Will I get a phone number with my eSIM?
Most travel eSIMs are data-only, meaning they do not include a local phone number. You keep your existing phone number on your regular SIM for calls and texts, and use the eSIM for mobile data. For voice calls abroad, use apps like WhatsApp, FaceTime, or Skype over your data connection.
Can I use my eSIM for hotspot/tethering?
It depends on the provider and plan. Many eSIM plans allow tethering (sharing your connection with other devices), but some providers like Holafly restrict it on certain plans. Check the plan details before purchasing if hotspot is important to you.
What happens when my eSIM data runs out?
When your data runs out, your internet connection will stop working on the eSIM. Most providers like Airalo let you purchase a top-up directly in their app. Alternatively, you can buy a new eSIM plan. Your regular SIM for calls and texts is not affected.
Is an eSIM secure?
Yes, eSIMs are at least as secure as physical SIM cards. They cannot be physically stolen or cloned as easily. The eSIM profile is encrypted and stored securely in your device's hardware. For extra security, providers like Saily (backed by NordVPN) offer additional privacy features.
Ready to Get Started?
Now that you know how eSIMs work, find the best deal for your destination:
Want to learn even more about eSIM technology? Visit whatisanesim.com for in-depth guides and technical details.