1) Check you’re eligible to switch from BT Mobile
If you’re out of contract you can switch from BT Mobile when you like and it won’t cost you anything to leave.
If you’re not sure if you’re still under contract, you can find out in a number of ways.
One option is to contact BT Mobile customer support on 150 from your mobile phone. Or by calling 0800 800 150 from any other phone (standard network rates apply).
Opening hours are 8am-8pm Monday-Friday and 9am-6pm Saturday and Sunday.
Alternatively, you can find your contract end date by opening the BT Mobile app on your phone. Or by logging in to your BT Mobile account.
2) Contact BT Mobile to tell them you want to leave and get a PAC Code
Now’s the time to contact BT Mobile to tell them you’d like to leave. You'll find contact numbers and opening hours for customer support in step 1.
While you’re on the phone to customer support, ask them for your PAC Code too. This is a short sequence of numbers and letters that’s vitally important for transferring your current phone number to the network you’re joining.
It’s a legal requirement that networks provide you with your PAC Code within two hours of your request. When you’ve got it, it’s clever to make a note of it. Just in case.
What’s most important to note, though, is that PAC Codes expire after 30 days. So if you haven’t used yours within this timeframe, you’ll need to get in touch with BT Mobile again to request a new one.
3) Find and buy a new phone or SIM deal from Three
Out of contract and ready to switch? Good news. Your next task is to sign up for a new phone contract or SIM only deal from Three. Once you’ve passed Three’s credit checks, you’ll receive your phone in the post.
4) Contact Three to give them your PAC code
We’re almost there now. Next you’ll just to ring Three to give them your PAC. You can reach their customer support team on 0333 338 1001 from a landline (standard network rates apply).
5) Insert your new Three SIM card
If you got a new phone as part of your contract, take the pin-key included in the box and unlock the handset's SIM tray. Then insert your Three SIM card.
If you went for a SIM-only deal instead, you can just put the Three SIM in your existing phone.
While the number transfer is taking place, you’ll be given a temporary phone number that you can use and on which people can contact you.
6) Wait for your number to be transferred
The transfer should be complete the next working day. However, this can vary from network to network and sometimes depends on whether the day after you make your call is a working day or a weekend.