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Three eSIM Transfer Guide

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A clear UK guide to Three eSIM Transfer Guide, covering setup steps, common causes, fixes, and related Three mobile setting

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Can you transfer a Three eSIM to a new phone?

Device Three eSIM Support Min. iOS / Android Version
iPhone 16 / 15 / 14✓ SupportediOS 16 or later
iPhone XS / XR / 11 / 12 / 13✓ SupportediOS 12.1 or later
Samsung Galaxy S24 / S23 / S22✓ SupportedAndroid 11 or later
Google Pixel 7 / 6 / 5 / 4✓ SupportedAndroid 10 or later
iPhone 8 / X and older✗ Not supportedPhysical SIM only

There's no plastic card with an eSIM — Three's profile downloads into the phone and then works identically to a physical SIM for calls, texts and data.

Three eSIM works on iPhone XS and later, Pixel 3 and later, Galaxy S20 and later, plus most Android flagships.

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eSIM setup checklist

Checkout through to a working data connection, start to finish

Step 1Use Wi-FiStep 2Scan QR codeStep 3Activate lineStep 4Set data SIMStep 5Restart phone

Steps to move your Three eSIM to another device

You'll need a solid Wi-Fi connection and Three's eSIM QR code, which arrives by email or via the app.

On an iPhone, open Settings → Mobile Data → Add eSIM, pick Use QR Code, scan Three's QR, then name the line and set priority.

On Samsung: Settings, Connections, SIM Card Manager, Add Mobile Plan — scan Three's code. Pixel goes via SIMs → Add eSIM.

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eSIM setup checklist

Checkout through to working Three data

Step 1Use Wi-FiStep 2Scan QR codeStep 3Activate lineStep 4Set data SIMStep 5Restart phone

What happens to your old phone after eSIM transfer (Three)

Scanning triggers an automatic profile download — typically one to five minutes with Wi-Fi active.

Activation failures trace to device incompatibility, eSIM not switched on, or a spent QR code. Three will send a replacement.

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eSIM setup checklist

From Three checkout to an active connection

Step 1Use Wi-FiStep 2Scan QR codeStep 3Activate lineStep 4Set data SIMStep 5Restart phone
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Fastest way to apply new APN settings
After saving, turn aeroplane mode ON for 10 seconds, then turn it OFF. This forces an immediate network re-registration — quicker than a full restart and equally effective.

Troubleshooting Three eSIM transfer errors

If activation stalls, check Wi-Fi, reboot, then retry through Settings → Mobile Data.

Signal missing post-activation: aeroplane mode toggle first, then confirm Three is the active data SIM.

A factory reset can erase the eSIM on certain phones — Three reissues the profile once the account is verified.

A Three eSIM doesn't transfer by re-scanning; use the Three app or contact support.

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Troubleshooting checklist

Sequential order resolves most Three faults early

Step 1Check APNStep 2Select APNStep 3Toggle flight modeStep 4Restart phoneStep 5Test data

eSIM vs physical SIM on Three — when transferring to a new phone

A Three eSIM matches a physical SIM on performance; the difference is convenience, with physical cards needed only on older phones.

Related guides

Three eSIM SetupThree eSIM Not WorkingHow to Activate Three eSIMThree APN SettingsThree MMS SettingsThree APN Settings for RoamingThree APN Settings Not WorkingThree 5G APN Settings
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eSIM setup checklist

From purchase through to a working data link

Step 1Use Wi-FiStep 2Scan QR codeStep 3Activate lineStep 4Set data SIMStep 5Restart phone

📚 Related Three Guides

Frequently Asked Questions About Three eSIM Transfer Guide

How do I activate my Three eSIM?
To activate your Three eSIM: order the eSIM from Three, then scan the QR code from your email in Settings → Mobile Data → Add eSIM (iPhone) or Settings → SIM Manager → Add SIM (Android).
Which phones support Three eSIM in the UK?
Three eSIM works on iPhone XS and later, Samsung Galaxy S20 and later, Google Pixel 3 and later, and most modern Android phones released after 2020.
Can I use Three eSIM and a physical SIM at the same time?
Yes, most modern phones support dual SIM — one physical SIM and one eSIM. You can use your Three eSIM alongside another carrier's physical SIM.
What do I do if my Three eSIM QR code is not working?
If the Three eSIM QR code fails, contact Three customer support to request a new QR code. Make sure you are scanning it on the device you want to activate — eSIM QR codes are single-use.
Does Three eSIM support 5G?
Yes, Three eSIM supports 5G on compatible devices. Ensure your phone is 5G-capable and your Three plan includes 5G access.