Go to Settings
Select Network and Internet
Select Mobile Network
Select Download a SIM instead
You’ll see a screen that says Download your SIM. Select Next.
You’ll see a screen that says Scan QR code from network, and at the bottom of the screen the option for Need Help. Select this.
On the page that says Help adding a network, select Enter it manually
Enter the activation code found in the QR code email we sent you
You’ll be asked if you want to use 3UK. Select Activate.
You’ll then be asked to enter the confirmation code that we sent in a separate email. Enter this, and select Continue.
Once completed, it will say 3UK is active. Select Done.
Once your plan has been added, you’ll be taken back to the Settings menu and will see that your Three plan is now active.