Yes, the Samsung Galaxy S21 Ultra supports eSIM, but availability can vary by country, carrier, and device model. If you want to use an eSIM on your S21 Ultra, first check whether your specific model and mobile network support the feature.
learn how to check eSIM support on Samsung S21 Ultra, how to add an eSIM, and what to do if the eSIM option is missing. Whether you’re using Jio, Airtel, or another supported carrier, these steps can help you determine compatibility quickly.
Samsung S21 Ultra, support eSIM phone or you’re thinking about buying one. You’ve heard about this eSIM thing and wonder if your phone can handle it. Maybe you’re planning a trip and want to avoid expensive roaming charges. Or perhaps you want to add a second number for work without carrying two phones.
I was in your exact position a couple of years ago. I had my S21 Ultra, I’d heard about eSIMs, and I couldn’t get a straight answer anywhere. Some websites said yes, others said no, and most just confused me with technical jargon.
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Yes, the Samsung S21 Ultra does support eSIM.
But here’s the catch – it’s not that simple for everyone. There are some important details you need to know about region restrictions, carrier support, and software versions. I’ll walk you through all of it.
The Short Answer (For People in a Hurry)
short on time, here’s what you need to know:
- Most Samsung S21 Ultra models support eSIM
- The US version (SM-G998U) supports it
- The international version (SM-G998B) supports it
- Some regional variants (like some Chinese models) do not
- Your carrier must also support eSIM activation
you have a standard S21 Ultra from the US, Europe, or most other regions, you’re good to go. But let’s dig deeper so you know exactly what you’re dealing with.
Does Samsung S21 Ultra Support eSIM?
Yes, the Samsung Galaxy S21 Ultra supports eSIM, but availability can vary by country, carrier, and device model. If you want to use an eSIM on your S21 Ultra, first check whether your specific model and mobile network support the feature.
learn how to check eSIM support on the Samsung S21 Ultra, how to add an eSIM, and what to do if the eSIM option is missing. Whether you’re using Jio, Airtel, or another supported carrier, these steps can help you determine compatibility quickly.
What Exactly Is an eSIM?
Before we get into the compatibility details, let’s make sure we’re on the same page about what an eSIM actually is.
An eSIM stands for “embedded SIM.” It’s a digital SIM card that’s built right into your phone’s hardware. There’s no physical card to insert, no tiny tray to fumble with, and nothing to lose.
Think of it this way:
A physical SIM card is like a physical key to your locker at the gym. You need to carry it, you can lose it, and you have to physically insert it to use it.
An eSIM is like a digital key that gets sent to your phone over the internet. You download it, activate it, and suddenly you have cellular service. No physical card needed.
Why does this matter?
With an eSIM, you can:
- Have two phone numbers on one device
- Switch carriers without waiting for a physical SIM to arrive
- Activate a data plan instantly when you travel
- Keep your main number while using a local plan abroad
The S21 Ultra was one of Samsung’s first flagship phones to fully embrace this technology. But as I mentioned, there are some important details to understand.
Samsung S21 Ultra Models and eSIM Compatibility
Here’s where things get a bit tricky. Samsung released different versions of the S21 Ultra for different regions, and not all of them handle eSIM the same way.
US Version – SM-G998U
you bought your S21 Ultra in the United States, you have the SM-G998U model. This version fully supports eSIM.
Carrier support in the US:
- T-Mobile: Full eSIM support
- AT&T: Full eSIM support (but you might need to visit a store for activation)
- Verizon: Full eSIM support (works well with their app)
- Unlocked models: Work with most carriers that support eSIM
The real experience: I helped my friend set up his T-Mobile eSIM on his US S21 Ultra. We scanned a QR code from T-Mobile’s website, and within two minutes, his phone had a second line active. It was surprisingly smooth.
International Version – SM-G998B
The international version, sold in Europe, the UK, Australia, and many other regions, also supports eSIM. This is actually the version that tends to have the most flexibility with carriers.
Carrier support internationally:
- Works with most major carriers in Europe
- Supported by carriers in Australia, the UK, and many Asian countries
- Some smaller carriers might not offer eSIM yet
The real experience: A friend in London used his international S21 Ultra with an EE eSIM. He got the QR code via email, scanned it, and had service in about three minutes. No store visit required.
Korean Version – SM-G998N
The Korean version supports eSIM, but it’s primarily designed for Korean carriers like SK Telecom and KT. If you’re using this version outside Korea, you might face some limitations.
Chinese Version – SM-G9980
This is where the problem lies. The Chinese version of the S21 Ultra typically does not support eSIM. There have been some reports of it working with specific Chinese carriers, but for the most part, eSIM is disabled on this model.
Why? Chinese regulations around eSIM are more restrictive, and many Chinese carriers haven’t fully embraced the technology. Samsung simply disabled it for that market.
How to Check Your Model Number
Not sure which version you have? Here’s how to check.
Method 1: Check in Settings
- Open Settings on your phone
- Scroll to the bottom and tap “About Phone”
- Look for “Model Number”
Method 2: Check the Box
The model number is printed on the box your phone came in.
Method 3: Check the SIM Tray
Sometimes the model number is printed near the SIM tray.
How to Set Up eSIM on Your Samsung S21 Ultra
The you’ve confirmed that your phone supports eSIM, here’s exactly how to set it up. I’ll walk you through both methods.
Method 1: Setting Up with a QR Code
This is the most common method. Your carrier sends you a QR code, and you scan it with your phone.
Step 1: Get Your QR Code
Contact your carrier and request an eSIM activation. They’ll usually send you a QR code via email or show it on their website.
Step 2: Open Settings
Swipe down from the top of your screen and tap the gear icon. Or find Settings in your app drawer.
Step 3: Go to Connections
In Settings, tap “Connections.”
Step 4: Tap SIM Card Manager
This is where all your SIM settings live.
Step 5: Tap Add eSIM
You’ll see an option to add a new eSIM. Tap it.
Step 6: Scan the QR Code
Your phone’s camera will open. Hold it over the QR code your carrier provided. Make sure it’s well-lit and fully in frame.
Step 7: Wait for the Download
The phone will download the eSIM profile. This takes about 30-60 seconds.
Step 8: Confirm Activation
Tap “Activate” and then “Continue.”
Step 9: Name Your eSIM
Give your eSIM a name that makes sense to you, like “Work Number” or “Travel Data.”
Step 10: Set Your Preferences
Choose which SIM you want to use for calls, texts, and data. You can change this later.
That’s it. You’re done.
Method 2: Manual Activation (Without QR Code)
Some carriers don’t provide QR codes. Instead, they give you an activation code.
Step 1: Go through Steps 1-4 above to reach SIM Card Manager.
Step 2: Tap “Add eSIM” and then look for “Enter activation code” or “Add manually.”
Step 3: Enter the SM-DP+ address and activation code your carrier provided. These usually look like long strings of letters and numbers.
Step 4: Tap “Activate” and wait for the download.
Step 5: Follow the remaining steps to name your eSIM and set your preferences.
Method 3: Using Your Carrier’s App
Some carriers let you activate eSIM directly through their app. This is becoming more common.
Step 1: Download your carrier’s official app from the Google Play Store.
Step 2: Log in to your account.
Step 3: Look for “Activate eSIM” or “Switch to eSIM” in the settings.
Step 4: Follow the app’s instructions. The profile gets sent directly to your phone.
Step 5: Confirm the activation in SIM Card Manager.
Managing Dual SIM on the S21 Ultra
Once you’ve set up your eSIM, you have two SIMs active on your phone. Here’s how to manage them effectively.
Choosing Default SIMs
Go to Settings > Connections > SIM Card Manager. You’ll see both your physical SIM and eSIM listed.
Calls: Choose which SIM makes outgoing calls by default. You can also set it to “Ask every time” – this is useful if you want to choose based on who you’re calling.
Texts: Choose which SIM sends text messages by default.
Mobile Data: Choose which SIM provides your internet connection. When you’re traveling, you’ll switch data to your eSIM.
I recommend: Keep your physical SIM for calls and texts from your home number, and use your eSIM for data when traveling or as a work line.
How to Tell Which SIM Is Which
When your phone is locked, you’ll see small icons at the top showing signal strength for both SIMs. Each SIM has a number (SIM 1 and SIM 2) so you know which line is active.
Real example: I keep my physical SIM as SIM 1 for my personal number and my eSIM as SIM 2 for work. When I’m in a meeting, I know it’s my work line ringing because it says “SIM 2” on the screen.
Using eSIM for International Travel
This is where the S21 Ultra’s eSIM capability really shines. Let me share how I’ve used it.
The Traditional Way (Before eSIM)
Before eSIM, traveling meant:
- Land in a new country
- Try to find a SIM card shop at the airport
- Deal with language barriers
- Hand over your passport
- Get a physical SIM card
- Swap out your home SIM
- Hope you don’t lose your home SIM
It was a hassle. I once spent 45 minutes in a Tokyo airport trying to explain to a clerk what I needed. Not fun.
The eSIM Way
With the S21 Ultra, it’s completely different:
- Before you leave, buy an eSIM data plan online
- You get a QR code via email
- Scan it on your phone
- You’re ready to go
Real example: I traveled to Thailand last year with my S21 Ultra. Before leaving, I bought a 15GB eSIM data plan from Airalo for about $20. I scanned the QR code at home before my flight. When I landed in Bangkok, I turned on the eSIM, and I had data instantly. I could call my hotel, check Google Maps, and text my family without any issues.
Which Travel eSIM Providers Work with the S21 Ultra?
These providers all work well with the S21 Ultra:
Airalo: Available in over 190 countries. The app is easy to use, and the prices are reasonable. I’ve used them in Japan, Thailand, and the UK.
Holafly: Offers unlimited data plans in many countries. More expensive than Airalo but good if you need lots of data.
Nomad: Good prices for regional plans (like Europe or Asia). They often have promotions.
Ubigi: Reliable and works well in many countries. They also offer plans for cruise ships.
Keepgo: Offers global plans that work across many countries. Good for frequent travelers.
Pro tip: Download the eSIM profile before you leave home. You need a Wi-Fi connection to download it, and airport Wi-Fi is notoriously unreliable.
Troubleshooting Common eSIM Issues on S21 Ultra
Things don’t always go smoothly. Here’s how to fix the most common problems.
Problem 1: The QR Code Won’t Scan
The camera isn’t picking up the QR code.
Fix: Increase your screen brightness to maximum. If the QR code is on another device’s screen, make sure that device’s brightness is also high. Hold the phone steady about 6-8 inches away. If it still doesn’t work, your carrier can usually provide a manual activation code.
Problem 2: The eSIM Profile Won’t Download
The download fails or takes forever.
Fix: Make sure you’re on a stable Wi-Fi connection. Mobile data might not work for the initial download. If you’re on Wi-Fi and it’s still failing, restart your phone and try again. If that doesn’t work, contact your carrier – they might need to resend the activation.
Problem 3: No Signal After Activation
You’ve activated the eSIM but have no service.
Fix: Go to Settings > Connections > Mobile Networks > Network Operators. Tap “Select automatically” or manually select your carrier. Sometimes the phone doesn’t automatically connect to the right network.
Problem 4: The Phone Says “eSIM Not Supported”
You’re trying to set up an eSIM, but the phone says it’s not supported.
Fix: First, check your model number. If you have the Chinese version (SM-G9980), it might genuinely not support eSIM. If you have another version, update your software. Go to Settings > Software Update > Download and Install. Samsung added eSIM support in later software updates.
Problem 5: Calls Going to the Wrong SIM
You set a default SIM, but calls are still going to the other one.
Fix: Go to SIM Card Manager and check your call settings. Make sure you’ve selected the correct default. Also, when you’re making a call, look for the SIM icon on the dialer – you can switch SIMs before dialing.
Problem 6: Data Is Slow on the eSIM
The eSIM connection is slower than expected.
Fix: First, check that you’re actually connected to the right network. Sometimes the phone connects to a slower network. Manually select a different network in Network Operators. Also, check your data plan – some travel eSIMs have speed limits after you use a certain amount of data.
Problem 7: The eSIM Disappears from Settings
The eSIM option has vanished from SIM Card Manager.
Fix: This usually happens after a software update. Restart your phone and the option should come back. If it doesn’t, go to Settings > Connections > More Connection Settings and look for eSIM settings there.
Pros and Cons of Using eSIM on S21 Ultra
After using eSIM on my S21 Ultra for over a year, here’s my honest take.
Pros
Incredible convenience for travel. No more hunting for SIM cards in foreign countries. I’ve saved hours of travel time by setting up eSIMs before I leave home.
Dual SIM capability without losing features. Unlike some phones that make you choose between a second SIM and an SD card, the S21 Ultra keeps its SD card slot while supporting eSIM.
Easy carrier switching. Want to try a new carrier? Download their eSIM profile and activate it. No waiting for a physical SIM to arrive in the mail.
No SIM card to lose or damage. I’ve seen people snap SIM trays, lose SIM cards, and struggle with tiny cards. eSIM eliminates all of that.
Keep your home number active while using local data. When traveling, you can keep your physical SIM for calls and texts while using the eSIM for data. No roaming charges on your home number.
Secure. A thief can’t just pop out your eSIM and use it in another phone. It’s locked to your device.
Cons
Not all carriers support eSIM. While it’s getting better, some carriers still don’t offer eSIM. This is especially true for smaller carriers and prepaid plans.
Setting up on a new phone is a hassle. You can’t just move your eSIM to a new phone like you would a physical SIM. You need to go through the activation process again.
No physical backup. If the eSIM activation fails, you don’t have a physical card to fall back on.
Some country restrictions. Certain countries don’t allow eSIM, which limits your options when traveling.
Limited profiles. The S21 Ultra can store multiple eSIM profiles but only use one at a time. If you travel frequently and want multiple country profiles, you need to switch between them.
Battery drain. Using two SIMs (physical and eSIM) can drain your battery slightly faster. It’s usually minimal, but worth noting.
S21 Ultra eSIM vs. Newer Samsung Phones
If you’re comparing the S21 Ultra to newer models, here’s how it stacks up.
S22 Ultra: Supports eSIM with basically the same functionality. The process is identical.
S23 Ultra: Same eSIM support. Software is slightly more refined.
S24 Ultra: Same support, but with improved features like more network band support.
The truth: The S21 Ultra’s eSIM functionality is just as good as newer phones for most practical purposes. The underlying technology hasn’t changed much.
If you’re considering upgrading just for eSIM, you don’t need to. The S21 Ultra handles everything you need.
Real-World Examples from S21 Ultra Users
Here are stories from people who’ve actually used eSIM on their S21 Ultra.
Maria, a digital nomad: “I travel constantly for work. The eSIM on my S21 Ultra has been a lifesaver. I buy a local eSIM before arriving in each country, and I have data the moment I land. I’ve used this in 12 countries this year without any issues. It’s made traveling so much less stressful.”
John, a small business owner: “I wanted a separate number for my business without carrying two phones. I set up an eSIM with a cheap prepaid plan, and now I have my personal number and business number on one device. I can easily disable the eSIM on weekends to separate work and life.”
Priya, an international student: “I’m studying in the UK from India. I keep my Indian physical SIM for family and friends to reach me, and I use a UK eSIM for local data and calls. Having both numbers active at the same time makes it so much easier to stay connected.”
David, a frequent traveler: “I used to hate arriving in a new country and hunting for a SIM card. Now I just scan a QR code on my S21 Ultra, and I’m online in minutes. The Airalo eSIM I used in Japan was literally $18 for 10GB of data. That’s cheaper than most physical SIM cards.”
Frequently Asked Questions
Does the Samsung S21 Ultra support eSIM?
Yes, the S21 Ultra supports eSIM. Most models (US, international, and Korean) have full eSIM support. The only exception is some Chinese versions where eSIM is disabled.
How many eSIMs can I have on my S21 Ultra?
You can store multiple eSIM profiles on the phone, but you can only use one eSIM at a time. You can switch between saved profiles in SIM Card Manager.
Can I use eSIM and physical SIM at the same time?
Yes, the S21 Ultra supports dual SIM with both SIMs active simultaneously. One physical SIM and one eSIM can work together.
Will I lose my physical SIM when I add an eSIM?
No, your physical SIM stays in the tray and continues working. The eSIM works alongside it. You have two active SIMs.
Do all carriers support eSIM on the S21 Ultra?
No, not all carriers offer eSIM. Most major carriers in the US, Europe, and Australia do. Check with your carrier specifically.
Can I transfer my eSIM to a new phone?
You usually can’t transfer eSIMs directly. You need to contact your carrier for a new activation code or QR code, then set it up on your new phone.
Does the S21 Ultra eSIM work with international travel?
Yes, many travel eSIM providers like Airalo, Holafly, and Nomad work well with the S21 Ultra. You can buy a plan online, scan a QR code, and have data when you land.
Why is my eSIM not showing up in settings?
This usually means your software is outdated. Update to the latest version. If that doesn’t work, check your model number to confirm eSIM support.
Is using an eSIM safe?
Yes, eSIMs use the same security standards as physical SIMs. In some ways, they’re more secure because no one can physically steal your eSIM.
Can I switch between eSIM profiles easily?
Yes, you can switch between saved eSIM profiles in SIM Card Manager. It takes just a few taps.
Will using eSIM drain my battery faster?
Using two SIMs can cause slightly more battery drain. Most users don’t notice a significant difference.
What if my eSIM stops working?
Contact your carrier. They can usually resend the activation details or issue a new eSIM profile.
Can I use a prepaid eSIM with the S21 Ultra?
Yes, many prepaid and travel eSIM providers work perfectly with the S21 Ultra. You can buy plans directly from their websites or apps.
Does the S21 Ultra eSIM support 5G?
Yes, the eSIM supports 5G connectivity if your carrier offers 5G and you’re in a 5G coverage area.
The Bottom Line
The Samsung S21 Ultra absolutely supports eSIM, and it does it well. Unless you have a specific regional variant (like some Chinese models), you have access to one of the most convenient mobile features available today.
The setup process is straightforward, the travel benefits are enormous, and the ability to have two numbers on one phone is genuinely useful for many people.
If you’ve been sitting on the fence about using eSIM, I’d say go for it. Start with a travel eSIM to try it out. Buy a small plan for your next trip, set it up before you leave, and see how easy it is. Once you experience the convenience of landing in a foreign country with immediate data, you’ll never want to go back to hunting for physical SIM cards.
Your S21 Ultra is ready for the eSIM future. All it needs is for you to take that first step.