What is an eSIM and how does it work: A complete guide

An eSIM is essentially a SIM card, but built into your device. Like SIM cards, they connect you to mobile networks for calls, browsing, and everything else that requires data. While SIM cards are still in use, smartphone manufacturers are phasing them out. In fact, Apple has already removed the SIM tray from its US iPhones. As eSIMs become more common, you might be anxious about what that means for your connectivity.

The switch to digital actually simplifies the process of getting online. Think of your eSIM as a digital wallet. Just as a digital wallet can hold multiple credit cards, a single eSIM lets you store multiple digital profiles (plans) on your phone. Phones that use traditional SIMs limit this by the available SIM slots.

Learn what an eSIM is and how it keeps you connected without a physical chip. We’ll cover the ins and outs of this technology and show you why it’s the safest and most practical option for international travel.

When should I use an eSIM?

The digital nature of this technology makes it highly beneficial in certain situations.

• Avoid expensive roaming fees while traveling. By using a travel data plan to stay online abroad, you bypass the high fees domestic carriers often charge.
• Separate your personal and business lines. Some eSIMs let you have two active phone numbers on a single device, making it easy to toggle between professional and private communications. You can assign specific lines for data, calls, and texts.
• Switch carriers without visiting a store. Rather than pick up a SIM card in person, some carriers allow you to sign up for a new service plan via an app or website and have it activated in minutes.

5 common myths about eSIMs (debunked)

There’s still a lot of confusion about how this tech works. Let’s clear up the biggest misconceptions.

Don't let these misconceptions hold you back! Switching to digital is much easier than most people think (and often reversible).

eSIM vs physical SIM: The real differences

The biggest contrast between an eSIM and a physical SIM is how you add and manage your mobile plan. One relies on a plastic card, while you manage the other in your phone’s settings.

How do eSIMs work?

Install the eSIM profile virtually. To do this, you’ll scan a QR code or enter activation details you’ve received from your carrier or provider. Travel eSIM providers usually let you set up everything easily within their app.

Once installed, you can turn your eSIM off or on and switch plans in your phone settings.

Does my phone support eSIMs?

Most newer smartphone models support eSIMs, but it also depends on your region and carrier restrictions. Check compatibility by dialing *#06# and looking for an Embedded Identity Document (EID) number. If you see one, your device supports eSIM.

Bear in mind that your phone must also be carrier-unlocked to use a third-party eSIM plan. Check with your carrier or navigate to the mobile network menu (Android) or general menu (iPhone) in your device settings. If multiple networks are available or you see “No SIM restrictions,” your phone is likely unlocked.

A typical dual SIM setup

One of the biggest distinctions between eSIMs and physical SIMs is the ability to manage multiple plans. You can save eight or more profiles on an iPhone or Android device (depending on model), though only two can be active at once. This allows you to keep your primary home number active for calls while using a second profile for travel or work.

Here are a few examples of this functionality in practice:

• One SIM card and one eSIM. This is the most routine setup. You keep your regular card in the tray and add a digital plan (for example, an eSIM for travel).
• Dual eSIM. Some newer models (iPhone 13 and later) allow you to run two eSIMs simultaneously, without using the tray at all.
• eSIM-only. Newer US iPhone models have removed the tray entirely, so eSIM is the only option.

Remember that eSIM profiles aren’t permanent. You can delete them if they’ve expired or you’re no longer using them.

Why are eSIMs particularly useful for travel?

One of the major advantages of eSIM technology is simplicity, which is essential when traveling. Instead of buying a local SIM card in every new country, set up a digital profile directly on your phone. There’s no need to keep swapping cards and risk damaging or losing them.

It’s possible to keep your home number active for calls and two-factor texts while using a virtual line for data. Messaging apps like iMessage, Messenger, and WhatsApp are internet-based, meaning they’ll still work even if you’ve set your travel eSIM as the primary data line.

Additionally, a travel profile eliminates roaming fees. Why worry about hitting a limit and paying extra when you can download a prepaid plan for a fraction of the cost? Top providers like holiday.com offer unlimited data packages and let you create custom plans for the exact number of days you need, helping you stay on budget.

You can set up your eSIM before you leave home and connect as soon as you land at your destination. You won’t have to hunt for a kiosk at the airport or struggle with language barriers to get online.

Digital profiles are also highly secure. Since thieves can’t steal the embedded hardware, your line is safer than it would be with a plastic card. This makes it easier to track your phone if it’s lost or stolen.

Make the switch to eSIM today

eSIM technology makes it easy to stay online by allowing you to switch carriers and plans effortlessly. You can download profiles wherever you are and keep using data and making calls as you always do.

For international travelers in particular, eSIMs are arguably superior. They’re safer and let you skip the hunt for SIM kiosks at a foreign airport. If your device supports eSIM functionality, making the switch from a local SIM to a travel eSIM is a no-brainer. You’ll save money on roaming fees and never have to worry about losing a tiny card again.