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O2 SIM Registration and Replacement Guide

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A simple UK guide to O2 eSIM Setup, covering setup steps, common causes, fixes, and related O2 mobile settings.

O2 eSIM Setup guide thumbnail

What 'SIM not provisioned' means and how to fix it (O2 SIM Registration and Replacement Guide)

Device O2 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 — it sits in the phone's hardware. Your O2 profile arrives as a download over Wi-Fi or data, then works identically to a physical SIM.

Supported devices run from iPhone XS, Pixel 3 and Galaxy S20 upward, plus most current Android flagships; dual SIM handsets take a physical SIM alongside the O2 eSIM.

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eSIM setup checklist

Each phase of getting an O2 eSIM running

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

Registering a new SIM on UK networks (O2 SIM Registration and Replacement Guide)

Get a stable Wi-Fi connection sorted first, along with the O2 eSIM QR code, usually sent by email or found in the O2 app.

On an iPhone, open Settings → Mobile Data → Add eSIM, pick Use QR Code, and scan O2's code. Finish by naming the line and choosing primary or secondary.

On Samsung: Settings, Connections, SIM Card Manager, Add Mobile Plan — scan O2's code when prompted. Pixel phones go via Settings → Network & Internet → SIMs → Add eSIM.

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eSIM setup checklist

The phases of activating an O2 eSIM

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

Cleaning and reseating your SIM card — O2 SIM Registration and Replacement Guide

After scanning, the phone pulls down the O2 profile by itself, typically in one to five minutes. Stay on Wi-Fi, and watch for O2's name in the status bar.

Activation failures typically trace to one of three causes: device incompatibility, eSIM not switched on for the account, or a QR code that's already been scanned. O2 can send a replacement.

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eSIM setup checklist

Step by step to a running O2 eSIM

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.

Getting a free replacement SIM from O2 — O2 SIM Registration and Replacement Guide

Activation not completing: confirm you're on Wi-Fi, reboot, then attempt it again via Settings → Mobile Data.

Signal missing post-activation: try cycling aeroplane mode, then check Settings → Mobile Data shows the O2 eSIM as the active data line.

Factory reset erased the eSIM? That's a known side effect on some devices — O2 can re-issue the profile once you verify the account.

The same O2 eSIM QR code won't work twice, so moving to a new phone means using the O2 app or contacting support.

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Troubleshooting checklist

Work down this list in order — the answer is normally in the first few entries

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

eSIM vs physical SIM on O2 (O2 SIM Registration and Replacement Guide)

An O2 eSIM matches a physical SIM exactly on speed and coverage. The difference is convenience — no card to handle, instant activation, switching lines without a swap. Older phones without eSIM support are where physical still wins.

Related guides

O2 eSIM SetupO2 eSIM Not WorkingHow to Activate O2 eSIMO2 APN SettingsO2 MMS SettingsO2 APN Settings for RoamingO2 APN Settings Not WorkingO2 5G APN Settings
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eSIM setup checklist

Every phase of an O2 eSIM setup

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

📚 Related O2 Guides

Frequently Asked Questions About O2 SIM Registration and Replacement Guide

How do I activate my O2 eSIM?
To activate your O2 eSIM: order the eSIM from O2, 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 O2 eSIM in the UK?
O2 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 O2 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 O2 eSIM alongside another carrier's physical SIM.
What do I do if my O2 eSIM QR code is not working?
If the O2 eSIM QR code fails, contact O2 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 O2 eSIM support 5G?
Yes, O2 eSIM supports 5G on compatible devices. Ensure your phone is 5G-capable and your O2 plan includes 5G access.