What is an eSIM?
The complete guide to embedded SIM technology - what it is, how it works, which devices support it, and why 1.5 billion eSIM-capable devices are now active worldwide.
Quick Answer
An eSIM (embedded SIM) is a tiny chip built directly into your smartphone, tablet, or smartwatch that does the same job as a traditional plastic SIM card - but digitally. Instead of inserting a physical card, you download a cellular plan by scanning a QR code. It takes about 60 seconds to set up, lets you store multiple phone plans on one device, and is the reason millions of travelers no longer buy SIM cards at airports.
From a real traveler
"I landed at Lisbon airport at 11pm on a Friday. No SIM card shops were open. With a physical SIM, I would have had zero connectivity until the next morning - no maps, no Uber, no way to message my Airbnb host. Instead, I had installed a Portugal eSIM on my iPhone during the flight's WiFi. The moment the plane touched down and I turned off airplane mode, I had 4G. I opened Uber, requested a ride, and messaged my host the ETA - all before I even stood up from my seat. That was the moment I realized I would never buy a physical SIM card abroad again."
- The experience that started eSIMpass
Definition
What Does eSIM Stand For?
eSIM stands for "embedded SIM." The "e" means the SIM card is permanently embedded (soldered) into your device's circuit board during manufacturing. Unlike a traditional SIM card that you can pop in and out, an eSIM is a fixed hardware component - like your phone's camera or fingerprint sensor.
But here is what makes eSIM revolutionary: even though the chip is physically fixed, the profile on it is completely reprogrammable. You can download, delete, and switch between cellular plans without ever opening your phone. Think of the eSIM chip as a rewritable blank canvas - and each cellular plan as a painting you can swap in and out digitally.
The simplest way to think about it: a physical SIM card is like a key that only opens one door. An eSIM is like a master keycard that can be reprogrammed to open any door - and you can carry multiple "keys" at once.
The Technical Definition
Technically, an eSIM is an eUICC (embedded Universal Integrated Circuit Card) - a secure hardware element that follows the GSMA Remote SIM Provisioning (RSP) standard. This standard, first published in 2016, defines how carriers worldwide can remotely provision (download) their SIM profiles to any eSIM-compatible device.
The eUICC chip measures just 6mm x 5mm - smaller than a grain of rice - and is soldered directly onto the device's motherboard. Despite its size, it contains the same authentication and encryption capabilities as a full-size SIM card, plus the ability to securely store multiple operator profiles simultaneously.
What this means in practice: when you buy a travel eSIM for Japan, you are not receiving a physical object. You are downloading a digital profile that tells your phone's eSIM chip how to authenticate with Japanese cellular networks. The whole process takes about 60 seconds.
Two Types of eSIM Plans
Travel eSIM (Data-Only)
Designed for travelers. Provides mobile data (internet) only - no phone number, no SMS. You keep your home SIM for calls and use the eSIM for browsing, maps, and messaging apps. This is what eSIMpass sells.
Carrier eSIM (Full Plan)
A full phone plan from carriers like AT&T, Vodafone, or T-Mobile. Includes a phone number, voice calls, SMS, and data - exactly like a physical SIM, but digital. Used for replacing your primary carrier plan.
Under the hood
How Does an eSIM Work?
The technology is complex, but using it is simple. Here is what happens when you set up an eSIM.
The Simple Version
Imagine your phone has a tiny, empty USB drive built into it. When you buy an eSIM plan, the carrier creates a digital "file" containing your plan details and network credentials. You scan a QR code, which tells your phone where to download this file. Your phone downloads it, stores it on the internal "drive," and uses it to connect to cellular networks.
You can store multiple "files" (plans) on this drive and switch between them through your phone's settings. Deleting one is as simple as deleting a file. Adding a new one is as simple as scanning another QR code.
Profile is Created
When you buy an eSIM plan, the carrier creates a digital profile containing your plan details, authentication keys, and network credentials. This profile lives on a secure server called SM-DP+ (Subscription Manager Data Preparation).
QR Code Delivered
You receive a QR code by email. This code contains the address of the server holding your profile and a unique activation code - think of it as a digital key to download your plan.
Secure Download
Your phone's eUICC (embedded Universal Integrated Circuit Card) contacts the server, authenticates itself, and securely downloads the profile. The entire exchange is encrypted end-to-end.
Network Connection
The eSIM profile tells your phone which cellular networks to connect to, just like a physical SIM would. Enable it in settings and you're online - with full 4G/5G speeds.
Pro Tip
Install your travel eSIM at home before your trip, while you still have WiFi. You need an internet connection to download the profile, but once installed, it works independently. When you land, just toggle it on in Settings.
History
The Evolution of SIM Cards: From Credit Card to Invisible
In 35 years, the SIM card shrank from the size of a credit card to a chip smaller than a grain of rice - and then disappeared entirely.
Full-Size SIM
85.6 x 54 mmThe original SIM card was the size of a credit card. Launched with the first GSM networks in Finland.
Mini SIM
25 x 15 mmShrunk to the size most people remember from early mobile phones. The standard for over a decade.
Micro SIM
15 x 12 mmPopularized by the iPhone 4 in 2010. About 52% smaller than the Mini SIM.
Nano SIM
12.3 x 8.8 mmIntroduced with the iPhone 5. Almost nothing but the chip itself. Still the most common physical format.
eSIM
6 x 5 mm (soldered)GSMA publishes the eSIM standard. The chip is built into the device - no tray, no swapping, no losing cards.
iSIM
Inside the processorThe next frontier: SIM functionality built directly into the phone's main processor chip. Even smaller, even more secure.
The pattern is clear: every generation of SIM technology has been smaller, more capable, and harder to lose. eSIM is not a novelty - it is the next logical step in a 35-year progression toward invisible connectivity.
Comparison
eSIM vs Physical SIM Card: What is the Difference?
A detailed side-by-side comparison across every dimension that matters.
eSIM wins in 10 out of 11 categories. The only advantage of physical SIM is universal device compatibility - but that gap is closing rapidly.
Compatibility
Which Phones and Devices Support eSIM?
Most smartphones released since 2020 include eSIM support. Here is the complete list organized by brand.
Apple
- iPhone 16 / 16 Pro / 16 Plus / 16 Pro Max
- iPhone 15 / 15 Pro / 15 Plus / 15 Pro Max
- iPhone 14 / 14 Pro / 14 Plus / 14 Pro Max(US models are eSIM-only)
- iPhone 13 / 13 Pro / 13 Mini / 13 Pro Max
- iPhone 12 / 12 Pro / 12 Mini / 12 Pro Max
- iPhone 11 / 11 Pro / 11 Pro Max
- iPhone XS / XS Max / XR(First iPhones with eSIM)
- iPhone SE (3rd gen)
- iPad Pro / Air / Mini (WiFi + Cellular)
- Apple Watch Series 4+ (GPS + Cellular)
Samsung
- Galaxy S25 / S25+ / S25 Ultra
- Galaxy S24 / S24+ / S24 Ultra
- Galaxy S23 / S23+ / S23 Ultra
- Galaxy S22 / S22+ / S22 Ultra
- Galaxy S21 / S21+ / S21 Ultra(5G models only)
- Galaxy Z Flip 3, 4, 5, 6
- Galaxy Z Fold 3, 4, 5, 6
- Galaxy A55 / A54 / A35(Budget eSIM options)
- Galaxy Watch 4+ (LTE models)
- Pixel 9 / 9 Pro / 9 Pro Fold
- Pixel 8 / 8 Pro / 8a
- Pixel 7 / 7 Pro / 7a
- Pixel 6 / 6 Pro / 6a
- Pixel 5 / 5a / 4 / 4a / 3 / 3a
- Pixel Fold
- Pixel Watch / Watch 2 (LTE)
Other Brands
- Motorola Razr (2023, 2024)
- OnePlus 12 / 11 / Open
- Xiaomi 14 / 13 / 13T Pro
- Oppo Find X6 / X7 Pro
- Sony Xperia 1 V / 5 V
- Microsoft Surface Pro / Duo
- Huawei P60 / Mate 60(eSIM in select regions)
Step-by-step
How to Set Up an eSIM
The process takes about 60 seconds. Here are the exact steps for iPhone and Android.
iPhone / iPad
Open Settings
Go to Settings > Cellular (or Mobile Data in some regions).
Add eSIM
Tap "Add eSIM" or "Add Cellular Plan." Select "Use QR Code."
Scan the QR Code
Point your camera at the QR code from your email. Your iPhone downloads the eSIM profile automatically.
Label Your Plan
Give it a label like "Travel Data" so you can easily identify it. Tap "Done."
Set as Data Line
When prompted, set the eSIM as your data line. Keep your home SIM for calls and texts.
Android (Samsung, Google, etc.)
Open Settings
Go to Settings > Network & Internet > SIMs (or Mobile Network on Samsung).
Add eSIM
Tap the "+" button or "Add eSIM." Select "Scan QR code."
Scan the QR Code
Point your camera at the QR code. The eSIM profile downloads and installs automatically.
Activate the eSIM
Toggle the eSIM on in your SIM settings. Set it as the preferred data connection.
Disable Home Data Roaming
Turn off data roaming on your home SIM to avoid surprise charges. Your eSIM handles data now.
Pro Tip
If you cannot scan the QR code (for example, if you only have one device), most eSIM providers also give you a manual activation code. On iPhone, go to Settings > Cellular > Add eSIM > "Enter Details Manually" and type in the SM-DP+ address and activation code from your email.
Advantages
8 Benefits of eSIM Over Physical SIM Cards
From instant activation to massive cost savings - here is why eSIM is better.
Instant Activation
Scan a QR code and connect in under 60 seconds. No waiting at airport SIM counters, no language barriers, no paperwork. You can set up your eSIM at midnight before an early flight.
Save 70-90% vs Roaming
Carrier roaming charges range from $5 to $20 per day. A travel eSIM for 7 days of data in Europe costs as little as $3-5 total. The savings are massive, especially on longer trips.
Keep Your Home Number Active
Dual SIM means your eSIM handles data while your physical SIM stays active for calls and texts. Receive important calls on your home number while browsing on cheap local data.
Store Multiple Plans
Keep eSIM profiles for your most-visited countries stored on your phone. Heading back to Japan? Just re-enable the profile you used last time - no need to buy again if it's still valid.
Multi-Country Coverage
Regional eSIM plans cover entire continents with a single plan. One eSIM for all of Europe, Southeast Asia, or Latin America. No swapping SIMs every time you cross a border.
More Secure Than Physical SIM
An eSIM cannot be physically removed, stolen, or cloned. Profiles are encrypted and stored in a secure chip. No risk of SIM-swap fraud at retail stores.
Better for the Planet
Every physical SIM means plastic, packaging, retail displays, and global shipping logistics. eSIM eliminates all of it - no card to manufacture, no warehouse to stock, no parcel to deliver. Zero physical footprint.
Full-Speed 4G/5G
Travel eSIMs connect to local carrier towers at native speeds. Unlike some carrier roaming plans that throttle you to 2G (128 kbps), eSIM gives you the same speed locals get.
For travelers
Why eSIM is a Game-Changer for International Travel
Compare the real cost of staying connected abroad. The savings speak for themselves.
| Method | 7-Day Cost | 14-Day Cost |
|---|---|---|
| Carrier Roaming (Verizon TravelPass) | $98 | $196 |
| Carrier Roaming (AT&T International Day Pass) | $84 | $168 |
| Carrier Roaming (T-Mobile Go5G) | $0 | $0 |
| Airport SIM Card | $25-40 | $40-60 |
| Pocket WiFi Rental | $56-105 | $112-210 |
| Travel eSIMBest Value | $3-8 | $8-15 |
Prices based on a European destination (e.g., France, Spain, Italy). Actual costs vary by destination and provider. Updated March 2026.
The Business Traveler
You fly to 3 countries this quarter. Instead of buying SIM cards at each airport or paying $14/day roaming, you buy 3 eSIM plans before you leave - totaling under $30 for all three trips. You land, toggle on the local eSIM, and join your first video call from the taxi.
The Backpacker
You are traveling through Southeast Asia for a month. Instead of hunting for SIM shops in each country, you buy one regional eSIM that covers Thailand, Vietnam, Cambodia, Indonesia, and more. One plan, zero border hassles, and you saved $100+ versus buying local SIMs everywhere.
The Family Vacation
A family of four heading to Europe. Enabling roaming for everyone would cost $56/day with Verizon TravelPass. Instead, you buy 4 eSIM plans for $20-30 total, set them up at home the night before, and everyone has full-speed data the moment you land in Barcelona.
Fact check
8 Common eSIM Myths - Debunked
Misinformation holds people back from trying eSIM. Let us set the record straight.
"eSIM is complicated to set up"
It takes 60 seconds. Open Settings, scan a QR code, done. It is literally the same motion as scanning a boarding pass or paying with your phone. If you can take a photo, you can install an eSIM.
"I will lose my phone number"
Your eSIM and physical SIM run side by side - that is the entire point of Dual SIM. Your home number stays active for calls and texts. The eSIM only adds a separate data connection.
"eSIM is more expensive than a physical SIM"
The opposite is true. Travel eSIMs cost $3-8 for a week of data versus $25-40 for an airport SIM card. You also skip the taxi to the SIM shop, the wait in line, and the language barrier.
"Only flagship phones support eSIM"
Budget phones like the Samsung Galaxy A54 ($350), Google Pixel 7a ($350), and even the iPhone SE ($429) all support eSIM. Over 60% of new smartphones sold in 2025 included eSIM.
"eSIM does not work in most countries"
eSIM providers like eSIMpass cover 190+ countries and territories. If a country has cellular networks, you can almost certainly get an eSIM for it. Coverage spans every continent including remote islands.
"If my phone breaks, I lose everything"
Your eSIM profile can be re-downloaded using the original QR code on a new device. Carrier eSIMs can be transferred by contacting customer support. Your profile is stored in the cloud, not just on your device.
"eSIM is just a trend that will fade"
Apple removed the physical SIM tray from US iPhone 14 models in 2022. Samsung and Google are following suit. The industry is moving to eSIM-only devices. It is not a trend - it is the replacement.
"I cannot use eSIM and WiFi at the same time"
eSIM and WiFi are completely independent. Your phone will prefer WiFi when available (as usual) and fall back to eSIM cellular data when WiFi is unavailable. They work together seamlessly.
Honest take
Current Limitations of eSIM
eSIM is not perfect yet. Here are the real drawbacks you should know about before switching.
Needs internet to install
You need WiFi or an existing data connection to download the eSIM profile. If you arrive in a country with no connectivity and have not pre-installed, you will need to find WiFi first.
Workaround: Install your eSIM at home before your trip - it only takes 60 seconds.
Not all phones support it
eSIM requires compatible hardware. Phones released before 2018 and many budget Android devices still lack eSIM support. You need to check compatibility before purchasing.
Workaround: Check our device compatibility page or search "[your phone model] eSIM support."
Carrier lock can block eSIM
If your phone is locked to a specific carrier, you may not be able to add eSIM profiles from other providers, even for data-only plans. This affects some phones purchased on installment plans.
Workaround: Contact your carrier to request an unlock, or buy your next phone unlocked directly from the manufacturer.
Transfer between devices is not seamless
You generally cannot move an eSIM profile from one phone to another with a simple tap. Most providers require you to delete the profile and re-download it on the new device.
Workaround: Always save your QR code email. Apple Quick Transfer is making this easier on newer iPhones.
Limited offline troubleshooting
If your eSIM stops working while abroad and you have no other internet connection, troubleshooting is harder than simply popping in a different physical SIM card from a local shop.
Workaround: Keep your physical SIM active as a backup. Most issues resolve by toggling the eSIM off and on in Settings.
The honest verdict: eSIM's limitations are real but manageable. Every limitation listed above has a practical workaround, and most are being actively solved by the industry. The benefits still far outweigh the drawbacks for the vast majority of users.
Growth
eSIM is Going Mainstream - Fast
The numbers tell a clear story: eSIM adoption is accelerating worldwide.
Key Industry Milestones
- 2017:Google Pixel 2 becomes the first smartphone with eSIM. Apple Watch Series 3 adds eSIM for cellular.
- 2018:Apple brings eSIM to iPhone for the first time with the XS, XS Max, and XR.
- 2020:Samsung Galaxy S20 series adds eSIM. Android eSIM ecosystem begins expanding rapidly.
- 2022:Apple removes the physical SIM tray from US iPhone 14 models - the first eSIM-only iPhone.
- 2024:Over 50% of all new smartphones worldwide ship with eSIM. Budget devices like Galaxy A54 adopt eSIM.
- 2026:1.5 billion eSIM-capable devices active globally. Travel eSIM industry exceeds $5 billion in revenue.
What comes next
The Future of eSIM Technology
eSIM is just the beginning. Here is what the next generation of SIM technology looks like.
iSIM (Integrated SIM)
SIM functionality built directly into the phone's main processor - Qualcomm and MediaTek are already shipping iSIM-capable chipsets. This makes the SIM even smaller, more power-efficient, and harder to hack. Expected to go mainstream by 2027.
eSIM-Only Smartphones
Apple led the charge by removing the SIM tray from US iPhone 14 models. More manufacturers are following. By 2028, most flagship phones are expected to be eSIM-only worldwide, with physical SIM slots becoming a "legacy" feature.
Multi-IMSI eSIM
Future eSIM profiles will be able to hold multiple network identities (IMSIs) in a single profile. Your phone will automatically switch between carriers depending on which one has the strongest signal - true global roaming without borders.
eSIM for IoT Everywhere
Connected cars, smart meters, industrial sensors, drones, and medical devices are adopting eSIM at scale. GSMA predicts 4+ billion IoT eSIM connections by 2030, far exceeding smartphone eSIM adoption.
Instant Number Porting
Regulators worldwide are pushing for instant number portability via eSIM. Instead of waiting 1-3 days to switch carriers, you will be able to transfer your number in minutes - directly through your phone settings.
Bottom line: the physical SIM card is on a clear path to extinction. eSIM is the present, and iSIM is the future. If you have not tried eSIM yet, now is the time - every major device manufacturer and carrier is investing heavily in this technology.
FAQ
Frequently Asked Questions About eSIM
Answers to the most common questions people ask about eSIM technology.
What does eSIM stand for?
Is eSIM free?
Can I use eSIM and a physical SIM at the same time?
Does eSIM work without WiFi?
Is eSIM secure?
Can I transfer my eSIM to a new phone?
Do I need to unlock my phone to use eSIM?
How many eSIM profiles can I store?
What happens when my eSIM data runs out?
Can I use eSIM for phone calls, or just data?
Does eSIM drain more battery than a physical SIM?
What if I delete my eSIM profile by accident?
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