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

BT PAC CodeIf you're leaving BT and joining another network or if you're leaving another network in order to join BT, 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 BT For Another Network

BT Mobile

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

Start by asking BT to issue you with a PAC Code. You can get a PAC Code from BT Mobile by calling 150 on your BT Mobile handset. Alternatively, dial 0800 800 150 from any other phone.

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

Monday - Friday8.00am - 8.00pm
Saturday9.00am - 6.00pm
Sunday9.00am - 6.00pm

It's always free to get a PAC Code from BT Mobile (it's your legal entitlement). After getting your BT 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 BT PAC Code

Your new network provider:

Joining BT From Another Network

BT Mobile

If you're joining BT Mobile 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 BT Mobile.

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

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

Get the Latest Deals from BT Mobile →

Once Your New Phone Arrives...

Once your new phone or SIM card arrives from BT Mobile, 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 BT Mobile's online form. Alternatively, you can give the PAC Code to BT Mobile by calling 150 on your BT Mobile handset. You can also call 0800 800 150 from any other phone.

If your PAC Code is provided before 3.00pm, your phone number transfer will normally be scheduled for the next working day (Monday to Friday only, excluding English bank holidays). For PAC Codes submitted after the 3.00pm cut-off, you'll need to wait one extra working day for your number to be transferred.

Upgrading Your Plan On BT

BT Mobile
BT Mobile

If you're simply upgrading to a newer handset or tariff, it's not necessary to use a BT Mobile PAC Code. You can simply upgrade via BT Mobile'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 BT Mobile 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 a BT PAC Code or when transferring their phone number from another network to BT Mobile.

Your Comments 1,335 so far

We would love to hear your comments: either about using a BT Mobile PAC Code or transferring your phone number from another network to BT Mobile. 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.

  • Hiya,

    I am looking at getting a new contract with another provider as my current one is a little pants.

    I am wondering if I was to take a contract with BT now, and then in Dec I cancel my EE one and ask for my PAC could I still transfer it to my BT.



    Andy transferred a phone number from EE to BT Mobile.

    • Hi Andy,
      Yes, of course 🙂 You can sign up to BT Mobile now and you can transfer your phone number over to them whenever you like (so you could continue using EE until December, at which point you move the phone number over to BT Mobile).
      Hope this helps!

  • Hi Ken, I transferred with a PAC code to BT from Three a few days ago. BT messed up and accidentally deactivated my phone number. I am still within the cooling off period and after the experience of their customer service would like to get another PAC code and transfer back (as I gather the original transfer cannot be recalled) but BT are saying this can’t be done unless my phone is reactivated, which takes a few working days and so might take me beyond the cooling off period of 14 days. Do I have any options other than to wait and try? Is there a way to cancel my contract with BT now and then force them to let me transfer it out?

    James transferred a phone number from Three to BT Mobile.

    • Hi James,
      Sorry to hear about the issues you faced transferring a phone number from Three to BT Mobile. Have they told you whether they’re able to recover your original phone number? I’d have thought that things should be fine as long as long as you tell BT you want to cancel the contract during the cooling-off period (if it takes extra time for them to amend their mistakes, this is something they should be liable for and it shouldn’t prevent you from being able to exercise your rights to cancel).

  • Kathryn Hulme said:

    I wonder if you could help please. I have an iPhone 4S and have recently changed from Vodaphone contract to a BT sim only, but kept my existing number. BT provided a temporary mobile number whilst I went through the change over process (only 1 day used) but now a lot of my contacts who are iPhone users state this temporary number still comes up when I text them or ring them?!
    Are you able to advise how I can correct this please?

    Kathryn Hulme transferred a phone number from Vodafone to BT Mobile.

    • Hi Kathryn,
      Thanks for your comment. After a phone number transfer, it’s possible that iMessage and FaceTime will continue showing the temporary number. To fix this, go to Settings > Messages and turn off iMessage. You may also need to turn off FaceTime. Once you’ve done this, go to Settings > Phone > My Number. You should now be able to update the phone number there (make sure it’s the phone number you’ve transferred from Vodafone to BT Mobile). Finally, restart your handset and enable iMessage and FaceTime again. This should hopefully solve the problems you’re having.

      • Kathryn Hulme replied:

        Hi Ken,

        Many thanks for this information. I have followed your instructions, but I still have the problem that when I send an iMessage it is sent on the temporary number, even though this is not live any more for me?!

        I have seen the problem I think, but unable to resolve if you can help further…..

        In Settings>Messages>Send&Receive – it has my email address for Apple ID, and on this page (but greyed out) it states “you can be reached by iMesssge at” then gives the ‘temporary’ number. Because it is greyed out, I cannot see a way of edited this. I have been into the Apple ID settings to see if there any changes I can make, but there is nothing to rectify this.

        Do you have a solution for me please??

        • Hi Kathryn,
          The option to change your phone number will normally be greyed out if you iMessage or FaceTime enabled on the phone. Have you tried going to Settings > Messages and turning off iMessage and FaceTime? You should then be able to change the setting in Settings > Phone > My Number (then restart your handset for everything to take effect). After restarting, you can turn on iMessage once again. If you’re still having problems, follow the ‘Unlink a phone number’ section on Apple’s help article.

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