Whether you're joining O2 or leaving for a different network, it's a straightforward process to keep your old phone number.

O2 PAC CodeIf you're leaving O2 and joining another network or if you're leaving another network in order to join O2, it's easy to keep your old phone number. All you need to do is to request a PAC Code: it's totally free and the entire process of transferring your phone number should normally take no longer than one working day.

For detailed instructions, please choose the option that best applies to you:

Leaving O2 For Another Network

O2

If you're leaving O2 and joining another network, you can take your phone number with you.

Start by asking O2 to issue you with a PAC Code.

If you're a Pay Monthly customer on O2, you can request a PAC Code by calling 202 on your O2 handset. Alternatively, dial 0344 8090202 from any other phone.

Alternatively, if you're a Pay As You Go customer on O2, request a PAC Code by calling 4445 on your O2 Pay As You Go handset. You can also call 0344 8090222 from any other phone.

You can request a PAC Code over the phone at any time during O2's opening hours:

Monday - Friday8.00am - 9.00pm
Saturday8.00am - 8.00pm
Sunday8.00am - 6.00pm

It's always free to get a PAC Code from O2 (it's your legal entitlement). After getting your O2 PAC Code, you'll need to provide it to your new network operator. For detailed instructions, please select your new network operator from the dropdown menu below:

PAC Code Finder: How to use your O2 PAC Code

Your new network provider:

Joining O2 From Another Network

O2

If you're joining O2 from another network, you should ask your old network to provide you with a PAC Code. The PAC Code will allow you to transfer your number to O2.

After getting the PAC Code, you should order your new handset or SIM card directly from O2's website. For more information, please select the type of tariff you're wanting to move to:

For a full list of the latest O2 deals, please see this page on O2's website.

Get the Latest Deals from O2 →

Once Your New Phone Arrives...

Once your new phone or SIM card arrives from O2, turn it on and make sure everything's working properly. If you need to return or change the new handset/SIM card, please do this before you transfer your phone number.

Once you're happy to continue with the transfer, your PAC Code should be entered on O2's online form. Alternatively, you can also provide your PAC Code to O2 over the phone:

If you're joining O2 Pay Monthly, you can submit your PAC Code by calling 202 on your O2 handset. Alternatively, call 0344 8090202 from any other phone.

If you're joining O2 Pay As You Go, submit your PAC Code by calling 4445 (0344 8090222 if you're calling from another network).

Providing your PAC Code to O2
The PAC Code should be submitted through a form on O2's website.

Once you've provided your PAC code to O2, your phone number transfer will normally be scheduled for the next working day (Monday to Friday only, excluding English bank holidays).

Upgrading Your Plan On O2

O2
O2

If you're simply upgrading to a newer handset or tariff, it's not necessary to use an O2 PAC Code. You can simply upgrade via O2's website. For more information, please select the type of tariff you're planning to move to:

More Information

For more information, please see the O2 website. You can also read our full guide on using a PAC Code: there's frequently asked questions amongst other tips for transferring your phone number.

For discussion, please see the comments on this page. They show other people's experiences either when using an O2 PAC Code or when transferring their phone number from another network to O2.

Your Comments 1,335 so far

We would love to hear your comments: either about using an O2 PAC Code or transferring your phone number from another network to O2. The comments below are all from people who've done the same thing in the past. You can contribute by adding your own comments here.

To see all 1335 comments about transferring a phone number, please see the main PAC Codes article.

  • I have not been able to top up for four days now as 2723 does not work from my phone for some unknown reason, 08000792723 also does not work from any other phones or landlines that I’ve tried.
    I’m not sure if there’s a problem with the system as they are also not replying to my emails.
    I have gone on to a contract yesterday with O2 but I can not get through to Asda for a pac code.
    If anybody from Asda can contact me with my pac code that would be great!
    Thanks

    Mandy transferred a phone number from ASDA Mobile to O2.

    • Hi Mandy,
      Many thanks for your comment. Have you tried 2732 (or 0800 079 2732 from a landline)? That should be the correct phone number for ASDA Mobile.
      Hope this helps,
      Ken

    • Hi Barbara,
      Yes – you are more than welcome to continue using your old O2 SIM card until the date your phone number finally moves over to Sky.
      Ken

  • Hi Ken, I have recently purchased a new smart phone and I want to move my existing number from Vodafone payg to O2 payg. On the O2 ‘keep your number’ form it asks you for ‘your number’, is this the Vodafone one I want to move and keep or the temporary O2 one I have been using? Maybe a silly question, but I’m not 100% sure.
    Also, while i get used to my new phone I have been using my new O2 sim on their ‘classic’ tarriff, when my vodafone number has been ported across, will i keep that tarriff and the credit i have purchased with O2? I know I will forfeit any remaining Vodafone credit. Thanks. L.J.

    L.J. transferred a phone number from Vodafone to O2.

    • Hi LJ,
      Many thanks for your comment. To answer your questions in turn:
      1. Yes, I believe the phone number you enter on the O2 keep your number form is the phone number you’d like to keep or preferred to be contacted on.
      2. You’ll keep all of the credit you’ve got on O2, along with your current tariff or bundle. The only thing that can’t be moved over if your Vodafone PAYG balance & credit.
      Hope this helps!
      Ken

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