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

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


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

Start by asking Three to issue you with a PAC Code. You can get a PAC Code from Three by calling 333 on your Three handset. Alternatively, dial 0333 338 1001 from any other phone.

You can request a PAC Code over the phone at any time during Three'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 Three (it's your legal entitlement). After getting your Three 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 Three PAC Code

Your new network provider:

Joining Three From Another Network


If you're joining Three 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 Three.

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

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

Get the Latest Deals from Three →

Once Your New Phone Arrives...

Once your new phone or SIM card arrives from Three, 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 Three's online form. Alternatively, you can give the PAC Code to Three by calling 333 on your Three handset. You can also call 0333 338 1001 from any other phone.

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

If your PAC Code is provided before 5.00pm, 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 5.00pm cut-off, you'll need to wait one extra working day for your number to be transferred.

Upgrading Your Plan On Three


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

Your Comments 1,257 so far

We would love to hear your comments: either about using a Three PAC Code or transferring your phone number from another network to Three. 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 1257 comments about transferring a phone number, please see the main PAC Codes article.

  • I am preparing to switch from Three to EE due to repeated network failure. If I obtain a PAC code from Three can I then cancel payments once the code has been given to EE or will this result in my loosing my existing number due to inactivity.

    I should explain that my 24 monthly contract expired in October.

    Derek Smith transferred a phone number from Three to EE.

    • Hi Derek,
      Many thanks for your comment. There’s actually no need to separately cancel your contract with Three: it’ll be done for you automatically when your phone number moves to EE. It’s likely that a 30-day notice period applies on your Three SIM card, so they may charge you for up to another 30 days after you move your phone number over.

  • Hi Ken,
    Thanks for the great website. I am on a sim-only plan with Three. I purchased another Three monthly plan with a third-party and requested to transfer the sim-only number to the new plan. They said they cannot do this until sim-only plan ends after 30 day notice – then it can be changed to PAYG then transferred. Can I request a PAC to transfer it to a temporary PAYG and then back to my new monthly plan to speed up the process? Is there any valid reason why they can refuse my requests? Thanks.

    Jon transferred a phone number within Three.

    • Hi Jon,
      Many thanks for your comment. Unfortunately, SIM only deals (of the Pay Monthly variety) have a 30-day notice period associated with them. What this means is you’re required to pay for another 30 days of usage after you ask them to cancel the SIM card (as an aside: I believe Ofcom is currently looking into this as many people, including myself, think it’s a bit unfair).
      You could use a PAC Code to transfer the phone number to another network, but you would still need to pay for another 30 days of usage after giving notice to Three that you want to end the contract. So yes, in theory, this could be a little faster but you’ll still need to pay the same amount overall.
      To save the hassle of having to do this, I’d probably serve out the 30 days and then transfer directly on Three. Alternatively, you could ask them to transfer you over early (but they may still want to charge you for the 30-day notice period).

  • Hello,

    If I want to arrange for my wife’s number to be ported from EE to Three but onto my existing Three account as an additional line (sim only contract), is this straightforward or would I encounter any difficulties due to the change of name, especially when filling out any online forms?


    sjaeagle5 transferred a phone number from EE to Three.

    • Hi there,
      This should be fairly straightforward and I shouldn’t envision any problems with it (just make sure you’re transferring the phone number onto a new line rather than onto an existing line!). There are no ownership name checks when using a PAC Code (see bullet point 3 here) so it’s no problem at all transferring to an account in your name.
      Hope this helps,

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