If you’ve upgraded your smartphone recently, you’ve probably seen the term eSIM pop up during setup. But what exactly is an eSIM, and how does it work? As mobile carriers and device makers move away from physical SIM cards, eSIMs are quickly becoming the new global standard.
In this guide, we’ll explain what an eSIM is, how to set it up on your iPhone or Android device, the advantages of using one, and the best eSIM options for travelers in 2025.
An eSIM, short for embedded SIM, is a digital version of the physical SIM card that connects your phone to a mobile network. Instead of inserting a plastic card into your device, an eSIM is built directly into your phone’s hardware.
It works through a process called Remote SIM Provisioning (RSP), which allows your carrier to send plan details securely over the internet. When you purchase a plan or data package, you receive a QR code or an activation link. Scanning this code downloads your eSIM profile, and within seconds, your phone is connected to the network, no physical SIM card needed.
eSIMs are designed for convenience and flexibility. They allow you to activate or switch carriers instantly without waiting for a SIM delivery or visiting a store. If you travel frequently, an eSIM can help you avoid roaming fees by letting you switch to a local or international data plan in seconds.
They’re also more secure, your eSIM is tied to your device and can’t be lost or cloned like a traditional SIM card. On top of that, eSIMs help reduce plastic waste and allow manufacturers to design thinner, more waterproof devices.
By 2025, almost all major smartphone brands support eSIM technology. Apple, Samsung, and Google were early adopters, but now brands like Motorola, Oppo, and Xiaomi are catching up fast.
All iPhones from the iPhone XS onward include eSIM capability and the iPhone Air is completely eSIM-only. Samsung’s Galaxy S20, S21, S22, and S23 series all support eSIMs, as do Google Pixel phones starting from the Pixel 3.
You’ll also find eSIM functionality in many tablets, laptops and smartwatches, including iPads, Apple Watch and Microsoft’s Surface Pro.
To check if your device supports eSIM, open your settings and look for an option that says “Add eSIM” or “Add Cellular Plan.”
Setting up an eSIM is quick and easy. On most devices, you simply go to Settings → Mobile Data → Add eSIM. Your carrier will give you a QR code or link to scan and once the profile is downloaded, your plan activates automatically.
If your phone supports Dual SIM Dual Standby, you can use both a physical SIM and an eSIM at the same time. This makes it easy to keep your main number active while adding a second line for travel or business.
When traveling abroad, eSIMs are especially useful. Providers like Airalo, Holafly and Saily let you purchase and install data plans before your trip. As soon as you land, your device connects instantly to the local network no need to swap SIM cards or hunt for kiosks.
The main difference between eSIMs and traditional SIM cards is flexibility. A physical SIM must be inserted and removed manually and you can only use one at a time. An eSIM, on the other hand, can store multiple carrier profiles, allowing you to switch between plans digitally.
eSIMs are also more secure, since they’re encrypted and linked directly to your device. They can’t be lost, damaged, or stolen and they make upgrading phones easier, since you can transfer your eSIM in a few taps through your carrier’s app.
Frequent travelers are some of the biggest fans of eSIM technology. Instead of paying high roaming fees, you can install a travel eSIM for local data wherever you go.
Airalo remains one of the best eSIM providers in 2025, offering affordable data plans in over 200 countries through a simple app. Holafly is another popular choice, known for its unlimited data options in Europe, Asia, and the Americas. Nomad provides flexible short-term data plans, and Ubigi offers excellent coverage for cars, tablets, and IoT devices.
These digital SIMs let you stay connected globally without swapping cards or dealing with confusing roaming rules.
Can I transfer an eSIM to another phone?
Yes, but you’ll usually need to delete the profile from your old phone and redownload it using your carrier’s QR code or app.
Do I need internet to activate an eSIM?
You’ll need Wi-Fi to download your eSIM profile, but once activated, it connects to the network like a regular SIM.
Can I use eSIMs everywhere?
Not yet. While most major carriers now support eSIMs, some smaller networks or regions still rely on physical SIM cards.
The eSIM revolution is just beginning. With the iPhone leading the charge toward eSIM-only devices, more manufacturers and carriers are expected to follow. In the next few years, iSIMs, integrated directly into a device’s processor, will make connectivity even faster and more secure.
We’re heading toward a world where mobile activation will be completely digital, letting you change carriers, upgrade devices, or travel abroad without touching a single SIM card.
eSIMs are more than just a new type of SIM card they represent the future of mobile connectivity. They make it easier to switch networks, stay connected abroad and manage multiple plans seamlessly.
Whether you’re setting up your first eSIM, comparing the best travel eSIMs for your next trip, or simply curious about how the technology works, now is the perfect time to make the switch. The era of physical SIM cards is ending and the eSIM revolution is here to stay.