1) Check you’re eligible to switch from O2
If you’re out of contract, you can switch whenever you like for no charge. To check if you’re out of contract, you can:
Open your O2 app on your phone. Once it’s open, head to ‘Allowances’ and then select ‘Tariff’ to see your end date.
Or visit the O2 account webpage. Then click ‘See if you can upgrade today’ and log in to see your contract end date.
Prefer to call? You can get in touch with O2's customer support team by calling 202 on your O2 phone. Or on 034 4809 0202 from any other phone (standard network charges apply).
Opening hours are 8am-8pm Monday-Friday. 8am-6pm on Sundays.
In the event that you’re keeping your existing phone and signing up for a new SIM only deal, you may need to unlock your O2 phone. Only when it’s unlocked will it accept the new SIM card.
To unlock it, though, you’ll need what’s called a personal unlocking key (PUK). The good news is that you can obtain easily by logging in to your O2 account. Once you’ve got the PUK, which you’ll receive as a text message, you can use it to unlock your phone.
2) Contact O2 to get your PAC code
Once you’ve signed up for the deal you’ve chosen, your next task is to ring O2 on one of the numbers in step 1 and tell them you want to leave. They’ll give you a contract end date that you should make a note of.
While you’re on the phone to them, you also need to ask for a PAC Code. It’s this short, alphanumeric code that will enable you to transfer your existing phone number to the network you want to join.
O2 is bound by law to provide a PAC Code within two hours of you asking for it.
3) Find and buy a SIM-only deal from BT Mobile
Next up, you’ll need to select a deal from BT Mobile and sign up for it through uSwitch.
BT Mobile will run some credit checks. After which point, your phone will be sent to you in the post.
4) Contact BT Mobile to give them your PAC Code
OK, it’s time to get in touch with BT and give them your PAC Code. Once you’ve done that the process of transferring your number to BT Mobile is in motion.
Get in touch with BT by calling 0800 800 150 (standard network rates apply). Opening hours are 8am-8pm Monday-Friday and 9am-6pm Saturday and Sunday.
5) Insert your BT Mobile SIM
Got a new phone from BT Mobile? Use the pin in the box to open the SIM tray and insert your new BT Mobile SIM.
If you opted for a SIM only deal, you'll just need to put the BT Mobile SIM in your existing phone.
The number transfer doesn’t happen instantly. But while it’s taking place, you’ll have a temporary number that you can use.
6) Wait for your number to be transferred to BT Mobile
BT Mobile typically completes number transfers the next day. However, it may take a bit longer, depending on how early in the day you made your request.
If there’s a weekend or Bank Holiday in the way, this may also hold up your transfer a little bit.