Keep your mobile number
Help and support
How to keep your mobile number | Help & Support | O2
Keep your mobile number
If you're new to O2 or changing your O2 contract, it's easy to keep your mobile number. All you need is a unique code, called a PAC (Porting Authorisation Code) or STAC (Service Termination Authorisation Code). Choose a PAC if you want to keep your phone number, or a STAC if you’d like a new number.
If you’re an existing customer thinking of leaving O2, find out how you can take your number with you.
- Bringing your number to O2
Before we can transfer your number, we'll need your PAC code – a code made up of three letters and six numbers. To get your PAC, text PAC to 65075, for free. You’ll receive it within 60 seconds and it’ll be valid for 30 days. Alternatively, you can request your PAC from your current mobile provider.
You can give us your PAC code when you order your new O2 connection or at any time afterwards. Once you’ve given us your PAC code, you’ll switch to our network within one working day (Monday-Friday, 9am-5pm, excluding bank holidays). If we receive your code after 5pm, you’ll switch within two working days. If you provide your PAC code at the weekend, you’ll switch on the following Tuesday.
If you want to switch to O2 at a later date, just contact us with your PAC code when you’re ready to switch. You can give us your PAC code online, call us on 202 free from your O2 phone or on 0344 809 0202 from any other phone, or visit an O2 store. PAC codes are only valid for 30 days, but if yours expires, don’t worry – you can always request a new one.
- What happens on the day your number transfers?
On the day of the number transfer, you’ll get a text reminding you that your number will be coming across to O2. Make sure you back up any contacts stored on your old network's sim card before the transfer, otherwise you could lose them.
Please be aware that you'll temporarily lose service while we transfer your number to our network. If you turn your phone off and on regularly, you may see the connection to our network more quickly. The transfer will be completed by 6pm the same day, but it may take up to 24 hours for text and picture messaging to work.
If you use an iPhone, once your number is up and running you’ll need to change the number in your iPhone’s settings (Settings > Phone > My Number) to your number. This will make sure your iMessages show as coming from the correct number.
We don’t need a PAC or STAC code to move your number between different parts of the O2 network. Just fill in the keep my number form. If you need to move your number between Pay As You Go and Pay Monthly with O2, you can follow the steps below. We’ll transfer your number within one working day (Monday-Friday, 9am-5pm, excluding bank holidays). If we receive your code after 5pm, you’ll switch within two working days.
- Switching your number from Pay As You Go to Pay Monthly
Fill in the keep my number form. You'll need your temporary Pay Monthly number from your O2 confirmation email or sim pack. We’ll transfer your number within one working day (Monday-Friday, 9am-5pm, excluding bank holidays). If we receive your code after 5pm, you’ll switch within two working days.
On the day of the switch, your Pay As You Go sim will lose signal. When this happens, put your Pay Monthly sim in your phone. If you don't have signal, switch your phone off and on every couple of hours until you get a signal. If you still don't have signal by 6pm, contact us.
Texts and picture messaging can take up to 24 hours to work after the switch.
If your Pay As You Go balance is under £350, it will be transferred to your Pay Monthly account when you receive your second bill. If you're entitled to a loyalty bonus, up to £550, we'll add credit to your fourth bill.
- Switching your number from Pay Monthly to Pay As You Go
We can take care of moving your number and even arrange for your new Pay As You Go sim. Get in touch by calling us on 202 free from your O2 phone, or on 0344 809 0202 from any other phone. We'll do the rest.
If you're on O2 Refresh you can only move to Pay As You Go once your Device Plan is paid. If you're not on O2 Refresh but still in your contract minimum term, you might need to pay a termination charge, and our Customer Service team can talk this through with you. You’ll receive your final Pay Monthly bill 14 days after you move to Pay As You Go. You’ll need to settle any outstanding balance.
If you've changed your mind about transferring your number, contact us and we'll be happy to help.
Swapping your sim? Find out how to keep your number when you get a new sim. If you haven’t already got a replacement sim, you can request one by calling us on 202, starting a webchat, or visiting an O2 store.