Using your SIM after upgrading.

Note: Before you activate your SIM, check your contacts are saved to your phone and not your SIM.

You can activate your new SIM in the Three app or fill in our SIM activation form.

Your SIM will be ready to use within 24 hours. Until then, keep using your old SIM and device. You'll know when your new SIM is ready to use when you're no longer able to make calls or send texts using your old one.

Once it’s activated, go to our device support to find out how to transfer your contacts.

If your SIM hasn't activated after 48 hours or you’re having problems activating your SIM, contact us using Live chat. Alternatively, you can visit a Three Store.

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