Ahh, the SIM card, a tiny physical card containing all the unique information that allows you to connect to your mobile network and stores all your identifying device and plan information. If you lose or damage the SIM during removal, you have to wait to get another one in store or by mail.
That’s why getting a device with an eSIM is so convenient—it’s built directly into your phone. You never have to worry about losing it, and transferring phone data via the cloud to another device only requires a reliable Wi-Fi connection. But what exactly is an eSIM, and is it safer than using a physical SIM? Why have they become the standard for new devices?
Find out everything you need to know about eSIM, including advantages and disadvantages, how to activate one on your device, and how to troubleshoot issues.
Table of Contents
What is an eSIM?
How does an eSIM work?
What are the advantages of using eSIM?
What are the disadvantages of eSIM?
eSIM vs physical SIM: Key differences
How to set up an eSIM on your device
Troubleshooting common eSIM issues
Which phones and carriers support eSIM?
How to get an eSIM data plan
FAQs About eSIM
What is an eSIM?
An embedded Subscriber Identity Module (eSIM) is a digital SIM built directly into a device. eSIMs eliminate the need for a physical SIM card, but some devices and carriers support using both. Depending on your device and carrier network, it may allow you to manage 5+ eSIMs simultaneously on one device.
Since an eSIM doesn’t require a physical swap and isn’t tied to a specific network carrier, it’s easier to switch carriers without losing your phone number or having to buy a new device. New plans are activated digitally using Wi-Fi and a QR code or app. An eSIM also provides seamless connectivity during international travel, effortlessly switching between networks.
How does an eSIM work?
eSIMs work the same as a traditional SIM, minus needing a physical card. A SIM card, embedded or physical, ensures calls and texts are routed to the right device. The eSIM authenticates your device and identity, allowing the carrier to accurately bill you for services like data, roaming, and airtime. It stores your contact information along with information about your messages, data, roaming, and device.
What are the advantages of using eSIM?
1. Use multiple numbers on one device
You can get a second number if you have more than one eSIM on your device (or a combination of an eSIM and a physical SIM), a separate number can be activated on each SIM. Some manufacturers or carriers limit how many can be activated at one time. For example, an iOS device can have 5+ eSIMs installed, but only two can be active simultaneously. This is useful if you want one device, but need a separate number for work or personal business.
2. Simplify carrier switching
eSIMs are carrier-independent, which makes it easier to switch mobile carriers without having to buy a new phone, and keep your number. A physical SIM is tied to a specific carrier, which means your number is too. With an eSIM, you won’t have to wait to receive a new physical SIM in the mail or pick one up. You can simply switch the device over to your new mobile network.
3. Enhanced security features
The use of a QR code to activate an eSIM involves encryption. An eSIM also reduces the risk of unauthorized access by requiring authentication credentials before making changes. Only you and your mobile carrier can alter your eSIM profile.
4. No physical SIM to damage or lose
Traditional SIM cards are small and can be easily damaged or lost during transfer to another device. You won’t have to worry about losing or damaging an eSIM while changing networks or providers because it’s embedded in your device. You can only lose an eSIM if your device is lost or stolen.
Even then, the criminal would have to bypass initial device security (e.g. passcode, pattern, facial recognition) to get to the eSIM information—which they can’t access without the proper credentials.
5. Ideal for international travel
The ability to quickly swap networks is useful if you need to change to a local network while traveling abroad. You can easily switch to a network that provides better coverage in areas where your network is unavailable or unstable. Using a local network also helps limit roaming charges.
What are the disadvantages of eSIM?
1. Limited device compatibility
eSIMs aren’t available on older devices, but most manufacturers make them the standard for new devices. Device compatibility may also depend on where you live. In some regions, like mainland China, iPhones and iPads are not eSIM-compatible.
2. Difficult to swap devices
While an eSIM makes it easier to switch your carrier network, it isn’t as convenient for swapping devices. Since an eSIM can’t be moved to a different device, keeping your number and other information is trickier than just putting your physical SIM into a new device. You use the cloud to transfer your data from one eSIM to another, so it takes longer.
3. Activation requires a stable internet connection
While an eSIM can’t connect to a carrier network without an active Wi-Fi connection, a physical SIM can. You need a stable Wi-Fi connection to activate an eSIM because the information is stored on the cloud, not a physical card. This is also true if you need to transfer data from one eSIM to another.
4. More Easily Tracked by Network Providers
Since an eSIM can’t be physically removed, you can’t just pop in a new one if it’s compromised, and this makes it easier to track your device. Your eSIM will remain the same—even if you get a new one, it will be attached to your number and associated with your device. On the other hand, if someone steals your phone or you lose it, it will be far easier for you to find.
5. Still susceptible to SIM swap attacks
The primary methods for performing SIM swap attacks are social engineering tactics. Attackers will attempt to trick you into freely giving them information about your eSIM, including the authentication credentials you use to manage your eSIM.
Because the attacks rely heavily on human error, eSIMs are no less susceptible. That’s why it’s crucial to stay informed on how to spot and avoid falling prey to social engineering attacks like phishing and vishing.
eSIM vs physical SIM: Key differences
| eSIM | Physical SIM |
| Embedded in electronics | Removable physical card |
| Not transferable to a new device | Easy to transfer to a new device |
| Not tied to carrier | Tied to carrier |
| Seamless roaming via digital carrier swap | Roaming via physical SIM swap |
| Flexible pay-as-you-go pricing plans | Fixed plans range from budget to premium |
How to set up an eSIM on your device
Set up an eSIM on iPhone
Step 1: Tap on Settings and then press Cellular.
Step 2: Scroll down to Add eSIM.
Step 3: If you are transferring an eSIM, select Transfer from Nearby Phone, or tap Use QR Code to add a new eSIM using a code provided by your carrier.
Set up an eSIM on Android
Step 1: Tap on Settings and press Connections.
Step 2: Scroll down and press on SIM manager.
Step 3: Choose Add eSIM from the menu.
Step 4: If you are transferring an eSIM, select Transfer SIM from another phone, or tap Scan QR Code to add a new eSIM using a code provided by your carrier.
How to use a QR code to activate an eSIM
Follow the instructions above for iOS or Android devices. When you reach the step where you can choose to scan a QR code to activate your eSIM, click on it. Follow the instructions, using the device’s camera to scan the QR code and complete setup.
Troubleshooting common eSIM issues
Issues during eSIM setup and activation aren’t uncommon. Luckily, we have some easy troubleshooting tips to help you get your eSIM up and running.
How to fix eSIM activation problems
- Check QR code: Check to ensure the QR code is valid and undamaged. If it gives you a ‘no longer valid’ or ‘eSIM already activated’ message, you should contact your eSIM provider to request a new code.
- Check device compatibility: Ensure your device and network carrier support eSIM use. Some device manufacturers only offer eSIM for devices in certain regions. For example, Apple doesn’t provide eSIM compatibility for iPhones or iPads in mainland China, Hong Kong, or Macao.
- Check carrier SIM limitations: Even if an eSIM isn’t tied to a specific device, the device may be tied to a carrier network. If your device is locked, you may not be able to use an eSIM from another carrier.
- Perform updates: It’s worth repeating that updating your device is crucial to ensuring all your hardware and software works correctly —including your eSIM. Updates fix bugs, provide security patches, and resolve other issues.
- Update carrier settings: If your device isn’t locked, check your carrier settings to ensure they update with your eSIM. This will ensure you have the latest network configurations from the appropriate carrier. You can find instructions on updating carrier settings on your device manufacturer’s website support portal or via customer support.
- Restart: Restart your device after attempting to activate the eSIM. This will disconnect and reconnect you to the carrier network, and could resolve the issue.
What to do if your eSIM isn’t working
Check device compatibility
Make sure your device is compatible with eSIMs. Look on the manufacturer’s website to see if your device is eSIM-compatible or ask customer support if you can’t find the information. Most major manufacturers, including Apple, Samsung, Google, and Motorola support or are equipped with an eSIM.
Perform software updates
Software and security updates are crucial. If you run outdated versions, your eSIM may work poorly. Install system updates as soon as possible, as they fix bugs and other issues with software and hardware—including those that impact eSIM functionality.
Toggle Airplane Mode on and off
When you switch to Airplane Mode, it disconnects you from all networks—mobile and Wi-Fi. That means turning it off gives you a fresh connection to all available networks. This can resolve connectivity issues for any minor networking glitches, including problems with your eSIM.
Choose your network
Devices don’t always connect to the best available network; instead they connect to the closest or fastest option—and your eSIM may not get the best connectivity. Open the Settings on your device and choose your network manually to get a better connection and see if it helps with eSIM connectivity.
Reboot your device
It sounds cliche, but it’s always a good idea to turn your device off and then back on. A reboot, not a restart, can eliminate most issues with an eSIM or other hardware and software. Your device will reestablish the connection to your eSIM and clear any connectivity issues.
Allow data roaming
Warning: Data roaming charges may apply if you turn on this feature. Charges will vary by your plan and network carrier.
If you travel internationally or have an eSIM from another country, you may need to activate data roaming for your eSIM to work correctly. Data roaming lets you use services outside your carrier’s network coverage area.
Reset your network settings
Warning: Resetting your network settings will erase all existing network preferences. Never reset your network settings before properly backing up your Wi-Fi passwords and mobile preferences.
Performing a reset on your network settings can clear corrupt data and temporary network files that could be causing your eSIM to malfunction.
Resolving compatibility issues with your eSIM
If you continue to have compatibility issues after trying the troubleshooting tips above, contact your eSIM provider for further instructions. Visit their official website and view their self-service portal or use the live chat or call options provided. You can also schedule a visit or walk into an offline store for assistance with activating your eSIM.
Which phones and carriers support eSIM?
Just because a phone or device supports eSIM doesn’t mean a network carrier does. It’s important to remember that availability relies on carrier and device capabilities. Verizon, T-Mobile, AT&T, and other large-scale mobile network giants do support eSIM technology, but availability varies by region. While most newer phone models support or use eSIM technology, an eSIM plan may not be available in your area.
With that in mind, let’s look at some manufacturers and devices that support eSIM.
Note: The manufacturers and devices below aren’t an exhaustive list of those that support eSIM. To find out if your device supports eSIM, check the support section of the device manufacturer’s website.
- Android (ex. Samsung Galaxy S24 or Tab S10)
- Google (ex. Pixel 9)
- iOS (ex. iPhone 16 or iPad 10th Gen)
- Hammer (ex. Blade 4)
- Motorola (ex. RAZR 50)
- OnePlus (ex. OnePlus 11 5G)
- Sony (ex. Xperia 1 VI)
- Xiaomi (ex. 12T Pro)
- Microsoft (ex. Windows 10 & 11)
- Acer (ex. Swift 7)
- Surface ( ex. Duo 2)
- Dell (ex. Latitude 9510)
- Asus (ex. Nova Go)
- Hewlett Packard (ex. HP Spectre Folio 15)
- Lenovo (ex. Yoga 520)
How to get an eSIM data plan
First, check to see if your device is eSIM-compatible. Some devices that use a physical SIM have eSIM capability; those that use eSIM alone may support dual eSIM. You must purchase a separate data plan to activate the eSIM.
You will also need to decide if you want a phone number attached to the eSIM or simply want to use it to back up your device information (data). Once you have all the information you need, you can follow these basic steps to purchase an eSIM plan and activate it on your device:
- Choose your carrier or log into your current carrier account (you can also call for assistance purchasing an eSIM plan if you want live support).
- Select your eSIM plan and complete your purchase.
- Scan the provided QR code using your device’s camera.
- Follow the on-screen instructions to complete activation.
FAQs About eSIM
What is eSIM and how does it work?
An eSIM is a digital SIM built directly into your device. It’s used to identify your phone on the mobile network. eSIMs eliminate the need for a physical SIM card, but perform the same functions. The eSIM ensures all calls and texts are routed to the right device. It also tracks data usage and roaming charges for billing purposes.
How do I activate an eSIM?
When you activate an eSIM, data is downloaded directly from the cloud to your device without any physical SIM swapping. Usually the carrier sends you a QR code to scan with the relevant activation information, so you just scan the code and follow the instructions. All you need is a reliable Wi-Fi connection.
Can I use an eSIM without a SIM card?
Yes. Many manufacturers have replaced physical SIMs with eSIMs. Some devices even support using more than one eSIM (or a combination of eSIM and a physical SIM), allowing you to have two phone numbers on one device.
Is an eSIM safer than a physical SIM?
Yes, but only marginally. Encryption is used during eSIM activation to protect your data during transfer. Only you and your mobile carrier can alter your eSIM profile; accessing or changing the profile requires authentication credentials. Additionally, an eSIM is harder to steal because it’s not removable.
You will still be susceptible to SIM swap attacks, via social engineering tactics like phishing and vishing because they rely more on human error than physical access to a device.
Does an eSIM give you a phone number?
No. An eSIM can be used for data only, so having one doesn’t always mean you receive a phone number. eSIMs are assigned phone numbers or data allotments based on your eSIM plan and mobile provider.
How does an eSIM affect my phone’s battery life?
One eSIM won’t affect your battery life much, but using multiple active eSIMs may increase battery consumption. This is due to the power it takes to access or switch between networks and ultimately run two phones on one device.
What is the major downside to an eSIM?
eSIMs are primarily installed in new devices and can’t be added to legacy devices or those that don’t already have an eSIM. That means you likely can’t use eSIM unless you have a newer device..
Is an eSIM better than a physical SIM?
No. They perform the same function and an eSIM is only slightly more secure than a physical SIM. The real benefit of an eSIM is that it makes switching between carriers and networks easier, especially while traveling internationally.
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Please advise re eSIM and traveling from the US to Europe
So why would Apple switch to the eSim?? What are the true underlining reasons. So big brother knows everything about where you are and where you have been? There is no advantage that I can see. Who actually changes sim cards in and out of their phone? The CIA?