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. When you're no longer able to make calls or send texts with your old SIM, your new SIM is ready.
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, get in touch. Alternatively, you can visit a Three store and one of our team will help you out.