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How to keep your mobile number

Help and support

Are you switching to (or from) O2? You can keep your old mobile number – whether you're joining us for the first time or moving to another provider.

It's quick, easy and free. And the best part? You don't need to learn a new number or tell all your friends and family. We can help keep things just as they were before.


On this page


Joining O2 - How to keep your mobile number

In this video, you can see how our online journey makes keeping your number easy.

Sign in to your My O2 account with a link we'll send you. You'll get two text messages – the first letting you know a one-time code is on its way and the second containing the code.

Next, select My O2 and scroll down to Transfer number. Here, you'll then have the option to Bring your number to O2.

There are alternative methods you can use if you prefer.

• Get your Porting Authorisation Code (PAC) by texting 'PAC' to 65075.

• Contact us

You'll need to ask your old network for your PAC if you're switching to O2 and want to keep your mobile number.

You can get your code by texting PAC to 65075 from the number you want to keep. Just follow the simple steps and you'll get your PAC within 60 seconds. You can also ask for it from your current provider.

Have you already switched to O2 or left your previous network provider? If you’ve now decided to keep your previous number, you can still request a PAC by contacting your previous network provider.

You have up to 30 days from when you left your previous network provider to request your PAC. You’ll then have 30 more days in which to provide us with your code.

You can give us your code when you order your new O2 connection – or any time after.

Sign in to My O2 to transfer your current mobile number to your new O2 connection.

Web browser: Go to the menu and select 'Switch to O2' and then ‘Move my number’.

My O2 app: Go to ‘Support’, and then ‘Keep your number’.

Remember, your PAC will expire after 30 days.

Your PAC should be stored in your text messages. If you lose your code, you can get it from My O2 or by calling us.

If you submit your request before 6pm

Day of request Expected day of switch to O2 network
Monday Tuesday
Tuesday Wednesday
Wednesday Thursday
Thursday Friday
Friday Monday
Saturday Tuesday
Sunday Tuesday

If you submit your request after 6pm

Day of request Expected day of switch to O2 network
Monday Wednesday
Tuesday Thursday
Wednesday Friday
Thursday Monday
Friday Tuesday
Saturday Tuesday
Sunday Tuesday

Yes you can. Just provide us with the number you want to switch and a valid PAC.

On the day of the switch, we’ll update your temporary O2 number to the number you want to keep. Until the switch takes place, you can continue to use your new O2 SIM with a temporary number or your SIM from your original network.

You’ll lose service on your original network when the switch takes place. The number you wanted to keep is now live on the O2 network. If you haven’t already, place your O2 SIM in your handset, and you’re ready to go. Switching usually happens by 4pm but can take up to 10pm. Loss of service is minimal, but if you do lose service, you’ll be back up and running by 10pm.

We’ll be in touch via text message if there are any issues with your switch, for example, if your PAC has expired.

We're committed to making sure you experience the smoothest possible switching journey, from the moment you request your PAC or Switching Information to the successful completion of your switch.

If we can't switch you on the day we told you we would, you'll be entitled to compensation. You don't need to do anything. We'll contact you within 30 days of the completion to let you know about the compensation.

If something goes wrong and we don't get in touch, you may be able to claim compensation by contacting us. Please also get in touch if you're registered for our Access for You service. You'll have up to 60 days from the issue date to claim your compensation.

Leaving O2 - How to keep your mobile number

We're sorry to hear that you're thinking of leaving O2. If you decide to switch to another network, you can take your phone number with you – but you'll need to request a PAC.

To keep your number when you switch to your new provider you'll need a PAC. A PAC lets you keep your existing number when switching networks.

To get this, you can:

• Give us a call

• Sign in to My O2

• Text PAC to 65075

You'll need to be in the UK when you request your PAC. You should get it within 60 seconds.

Do you have an Apple Watch on a Pay Monthly contract? Or perhaps you have multiple numbers on your account. If so, you won't be able to use the text service. Please sign in to My O2 or call us to request your PAC.

If you want to switch more than 24 numbers in one go, you can do this over the phone. You can also make more than one PAC request in My O2.

Your PAC should be stored in your text messages. If you lose your code, you can get it from My O2 or by calling us.

Yes, you can give the same PAC to multiple networks if you’re switching to more than one.

You can still request your PAC by contacting us. You have up to 30 days from when you leave O2 to request a code from us. It'll then be valid for an additional 30 days from the date of issue.

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.

While we're sorry to see you leave, we still want your switch to go as smoothly as possible. You may need to contact your new provider if the transfer of your number doesn't happen on the day it's supposed to. But you can always contact us if there's a problem with your PAC or number transfer, in case it's something we can help with.

Switching between O2 Pay Monthly and Pay As You Go

You can keep your existing O2 number even if you're switching between Pay As You Go and Pay Monthly plans.

Swapping your O2 SIM

You can move your mobile number across to a new or replacement SIM quickly and easily using My O2.

If you’re an O2 Business customer, please sign in to My O2 Business to swap your SIM.

Find out more information about swapping your SIM – including how to request a new SIM and how long it takes for the swap to happen.

Changed your mind?

If you’ve changed your mind about transferring your number, get in touch with us and we’ll be happy to help.

VIP customers

If you’re switching to O2 from another network, keeping your mobile number is simple – just ask your old network for a Porting Authorisation Code (PAC). Once you get this, you can provide it when you order your new O2 connection or any time afterwards.

Please contact your VIP personal Customer Service team to give us your PAC.

If you're leaving O2 for another network, we're sorry to see you go.

You'll need to request a PAC if you want to keep your phone number. To request your code, call your VIP personal Customer Service team, sign in to My O2, or text PAC to 65075 for free.

You should receive your PAC within 60 seconds.

If you have multiple numbers on your account, you won’t be able to use the text service. You’ll need to contact your VIP personal Customer Service team or go to My O2.

If you've already switched or left O2, you can request a PAC by calling your personal Customer Service team. You have up to 30 days from when you leave O2 to request a code from us, and it'll be valid for an additional 30 days from the date of issue."

You don't have to keep your current number if you're joining or leaving us. You're more than welcome to get a new O2 phone number – or one from your new provider if you're switching from us. If you want to disconnect your old number, that can quickly be done.

If you’ve changed your mind about transferring your number, get in touch and we’ll be happy to help.

Last updated: 14/01/2026



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