For travelers, remote workers, and users who frequently switch mobile plans, eSIM offers a more flexible way to stay connected on Samsung Galaxy devices.
The Galaxy S21 and Galaxy S21 5G both support eSIM functionality, allowing you to activate a mobile plan digitally without additional hardware or complicated setup procedures.
Installing an iRoamly eSIM only takes a few minutes as long as your device is connected to Wi-Fi and your activation details are ready.
In this article, you’ll learn how to install the eSIM using a QR code or activation code, enable the mobile plan, and verify that the network connection is working correctly on your Galaxy S21 series device.
Preparations Before Setting Up iRomly eSIM
Before starting the installation process, make sure you have the following ready:
A stable internet connection (Wi-Fi is recommended)
A valid eSIM QR code or activation code provided by your carrier
Your Galaxy S21 or Galaxy S21 5G powered on and unlocked
The device updated to the latest available One UI version for better eSIM compatibility
The carrier account activated and eligible for eSIM service
Method 1: Install eSIM Using a QR Code
Step 1: Open SIM Card Manager
Open Settings
Tap Connections
Tap SIM card manager
Step 2: Start Adding an eSIM
Tap Add mobile plan
The phone will search for available carrier plans.
Step 3: Open the QR Code Scanner
Under Other ways to add plans
Tap Scan carrier QR code
The QR code scanner will open automatically.
Step 4: Scan the Carrier QR Code
Position the QR code inside the scanning frame
Wait for the device to recognize the QR code automatically
When the mobile plan appears, tap Add
The Galaxy S21 will begin downloading the eSIM profile.
Step 5: Complete Installation
Wait for the installation process to finish
Tap OK if prompted
Tap Done
The installed eSIM profile will now appear in SIM card manager.
Step 6: Enable the eSIM
Stay in Settings → Connections → SIM card manager
Locate the newly installed mobile plan
Tap the switch next to the eSIM to turn it On
If prompted:
Tap Restart
The eSIM will activate after the device reboots.
Method 2: Install eSIM Using Manual Activation Code
Step 1: Open SIM Card Manager
Open Settings
Tap Connections
Tap SIM card manager
Step 2: Start Adding an eSIM
Tap Add mobile plan
The mobile plan setup page will open.
Step 3: Open the QR Code Scanner Page
Under Other ways to add plans
Tap Scan carrier QR code
The QR code scanning screen will appear.
Step 4: Open Manual Code Entry
On the QR code scanner screen
Tap Enter code instead
This option appears below the QR scanning frame.
Step 5: Enter the Activation Code
The phone will open the Add using activation code page.
Tap the Activation code field
Enter the activation code exactly as provided by your carrier
After entering the code:
Tap Connect
The Galaxy S21 will contact the carrier server and begin downloading the eSIM profile.
Step 6: Finish Installation
Wait for the eSIM profile to install completely
Tap Done
The installed eSIM profile will now appear in SIM card manager.
Step 7: Enable the eSIM
In SIM card manager, locate the installed eSIM
Tap the switch next to the mobile plan to turn it On
Tap Restart if prompted
The eSIM will become active after rebooting.
How to Confirm the eSIM Was Successfully Installed
Check SIM Card Manager
Open Settings
Tap Connections
Tap SIM card manager
You should see:
The carrier name
The installed mobile plan
The eSIM toggle switched to On
Check Network Signal
Look at the top-right corner of the screen.
You should see:
Signal bars
Carrier network name
LTE, 4G, or 5G indicator
Test Mobile Connectivity
Perform the following checks:
Make a phone call
Send a text message
Open a webpage using mobile data
If all services work normally, the eSIM installation was successful.
Note: Some eSIM plans may not include voice calling support, so this feature might not be available depending on your plan.
Conclusion
Once the setup is complete, your Galaxy S20 Ultra or Galaxy S20 Ultra 5G should be fully configured to use the installed iRoamly eSIM. In most cases, the phone will automatically connect to the network shortly after the activation finishes.
If needed, you can return to the SIM card manager anytime to enable or disable the eSIM, switch preferred data lines, or manage multiple SIM profiles directly from your Samsung device settings.