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, changing your O2 contract, or leaving O2, it's easy to keep your mobile number.
Switching between networks? 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.
- Bringing your number to O2
Before we can transfer your number, we'll need your PAC code. This is made up of three letters and six numbers. You can get this from your current provider and it will be valid for 30 days.
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.Or call us on 202 free from your O2 phone, 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.
- Leaving O2 and taking your number
We’re sorry you’re thinking of switching. We’re here if you’d like to discuss your options or hear about any offers – just give us a call on 202, free from your O2 phone. Or if you’d like to know whether there’d be anything to pay if you switched, or what your credit balance is if you’re on Pay As You Go, you can get an estimate of any charges or credit by calling on 202, signing in to My O2, or texting INFO to 85075.
If you decide to switch to another network, you’ll need to request a PAC code if you want to keep your phone number, or a STAC code if you’d like a new number. You can request your code by giving us a call on 202, signing in to My O2, or:
- Texting PAC to 65075, for free, if you want to keep your phone number
- Texting STAC to 75075, for free, if you don’t want to keep your phone number.
If you have multiple numbers on your account, or if you have an Apple Watch on a Pay Monthly plan, you won’t be able to use the text service. You’ll need to sign in to My O2 or give us a call to request your PAC or STAC code. If you want to switch more than 24 numbers at a time, we’ll be able to help you on the phone or you can make more than one request in My O2.
If you want a PAC code, you’ll need to be in the UK to request it. But remember that if you're on O2 Refresh, including our custom plans, you can change your phone or tariff whenever you like.
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.