Switching from O2 to Sky Mobile? It's a straightforward process to keep your existing phone number.

Sky Mobile

Step 1: Obtain a PAC Code from O2

The first step is to contact O2 to obtain your Porting Authorisation Code (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

Here are some key things to know:

  • A PAC Code is 9 digits long and follows the format ABC 123 456.
  • O2 must provide a PAC code within 2 hours of your request. If they don't, they must provide a valid reason for why the PAC Code can't be issued. Your right to a PAC code is enshrined within clause 18 of Ofcom's "General Conditions of Entitlement".
  • Your PAC Code is valid for 30 days. If you don't use it during this time, the PAC code will expire and you'll need to request a new one.
  • You shouldn't close your account at O2: it'll end automatically when your phone number is transferred to Sky Mobile.

Step 2: Order your new phone or SIM card from Sky Mobile's website

You should now order your new phone or SIM card using the Sky Mobile website. Please select the type of tariff you're intending to move to:

For a full list of available tariffs and the latest Sky Mobile deals, please refer to this page on Sky Mobile's website.

Sky Mobile will assign you with a temporary phone number during the transition process. This will allow you to test out the service before you finally transfer your phone number to Sky Mobile.

Step 3: Give the PAC Code to Sky Mobile

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

Once you're happy to continue with the phone number transfer, contact Sky Mobile and provide them with your PAC Code.

You can give the PAC Code to Sky Mobile by calling 0330 041 4136 on your Sky Mobile handset. You can also call 0330 041 4136 from any other phone.


  • You must provide the PAC Code to Sky Mobile within 30 days of it being issued by O2. If the PAC Code has already expired, you'll need to return to step 1 and request a new PAC Code from O2.
  • O2 Pay As You Go customers: Try to use up your remaining credit as it can't be transferred to Sky Mobile.

Step 4: Phone Number Transferred (Next Working Day)

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

On the day of the transfer, you'll momentarily lose coverage on both mobile networks. When this happens, restart your handset on Sky Mobile. You should find that the Sky Mobile phone or SIM card will now associated with your original phone number.

  • If you see an error message (e.g. "SIM card registration failed"), this means it's time to restart your phone.
  • Once the phone number has been transferred to Sky Mobile, your account on O2 will automatically be closed. You'll receive a final bill from O2 for any outstanding charges.

Get the Latest Deals from Sky Mobile →

Any Other Questions?

In case of any problems during the transfer of your phone number, you should contact your new mobile network (Sky Mobile) with details of the problem.

If you have any other questions on using a PAC Code, please see my in-depth guide to transferring your phone number between networks. You can also read comments from other visitors of this site.

← Full Article: "PAC Codes - How to transfer your mobile number when switching networks"

Your Comments 1,211 so far

We'd love to hear your comments on transferring a phone number from O2 to Sky Mobile. The comments below are from people who've made the same transfer. You can add your own comments here.

To view all 1211 comments about transferring a phone number, please visit the main PAC Code article.

  • Hi Ken,

    Firstly, thank you for the helpful and easy to understand guides.

    I am looking to transfer my current O2 number to a Sky mobile deal. I have no issue with the normal process but I have lost my current O2 mobile, so to port a number from O2 to Sky, would my old (lost) mobile need to be powered on?

    I know I can gain the PAC over a landline.



    • Hi Terry,
      The PAC Code is generated on the mobile network side, and doesn’t relate at all to your handset. So there’s no need to power on your old mobile phone (you just need to be able to contact O2 Customer Services and clear security with them to obtain the PAC Code).

  • Hi Ken I’m switching to Sky monthly from o2 PAYG and o2 are telling me they will charge me £15 for an unlock pin as phone only a few months old but have provided a pac code. Is thus allowed as I paid for phone outright?

    • Hi Matt,
      Thanks for your question about moving your phone number from O2 to Sky Mobile. With regards to O2 charging you £15 to unlock your handset, this is allowed and is O2 policy for customers who’ve had their handset for less than 12 months (their justification for this is you would have received the handset on a subsidised/discounted basis). The PAC Code, however, should always be free and you should never be charged for it.
      Hope this helps!

Leave a Reply

Your email address will not be published. Required fields are marked *