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How to change your mobile number

by on ‎02-08-2019 15:18 - last edited on ‎11-09-2020 15:10 by Community Manager (134,863 Views)

Get a new O2 mobile number


You can do this by simply calling customer services on 202 (Pay Monthly) or 4445 (Pay as you go).

O2 will allow you one free mobile number change should you wish to change it.

After that you will be charged a one off fee of £35.00 if you want to change again.


Things to keep in mind: 

  • If you call to change your number and call from the number you want to change, the call will get disconnected as part of the process. The number change is processed and a new number is auto-allocated, which disconnects the existing number immediately.
  • If you can call from an alternate number, you will be able to finish the conversation and get the new number from the advisor. Otherwise, you will have to call someone to find out what your new number is once it’s complete.




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Change your O2 mobile number to your previous number

Alternatively, if you have a SIM card from another provider which you don't use anymore and is still active, you can transfer your number across to your current O2 SIM card free of charge by calling one of the above customer service numbers after obtaining your PAC code.


You can do this by texting PAC to 65075. More information on that process in our Guide: How to get your PAC 2019 Update and Guide: Migration & porting into O2.


I want to keep my number, but am getting a lot of unwanted calls: what can I do?

If you'd rather keep your current O2 number but you're getting nuisance calls, you can register with the Telephone Preference Service (TPS) for free and will dramatically reduce cold calls from companies after 28 days. This service is free of charge.

Register by visiting the website or by texting TPS and your email address to 85095.

It is also worth noting that most modern smartphones have a call block feature which will block all calls and texts from a number. Settings differ from handset to handset so please check your user guide to find out how if you don't know. Once the call block is in place, the person you've blocked will be diverted straight to your O2 Voicemail. If you want to switch that service off and have O2 Call Alert instead which notifies you of missed calls when your phone is switched off or out of service then call 1710 free from your O2 handset.


More info on this in our Guide: A Guide to Deal with Spam/Scam Calls and Text.

on ‎02-08-2019 15:43
Nice guide @SamsungFanBoy. Very helpful Smiley Happy
on ‎02-08-2019 18:28

Good Guide Smiley Happy

on ‎02-08-2019 20:20

Nice guide @SamsungFanBoy 

on ‎02-08-2019 20:43

Good guide @SamsungFanBoy 


If I could just suggest a footnote.


If you change your number because of nuisance or threatening calls, it is advisable to never associate your new number with any social media apps such as Facebook, Messenger etc. Any other social apps where a text is sent to your phone will already be registered with your old number. Changing your number won't affect those existing apps.

Also be very careful who you share the new number with.

on ‎05-08-2019 15:34

Awesome guide @SamsungFanBoy ! Thanks for putting this together.

We've added this to the Guide Mentions, so when linking to it, you can just type # and "number" and it should easily come up! Smiley Happy

on ‎03-09-2019 03:55
Sorry for the late response but thanks guys! I've been stupidly busy of late and haven't been on here as much!
on ‎03-09-2019 07:58
Hi @SamsungFanBoy
No problem understood working.
Actually your guide is very helpful as quite a few distress posts have been put up just recently whereby o2 customers are receiving a huge amount of calls daily. To the point of distraction. I have just been reading it myself but hopefully won't need to take drastic action yet.
on ‎03-09-2019 23:18

The recent spate of spam/scam calls are apparently down to O2's filters and so we're actually hoping this is a quick fix and customers won't need to change number. I expect O2 will refund any charges due to their system failure.

on ‎09-04-2020 08:19
I am trying to bring my 3 network number to O2 but it is not working.
I have first tried on Monday, still not done so tried again yesterday but now it is giving error message.
on ‎09-04-2020 08:23


Did you follow this advice?


If still having issues then you need to contact customer services Guide: How to find help & contact O2 

on ‎09-04-2020 08:33
Yes that’s exactly the form I have used. But it has been two days still no change.
on ‎09-04-2020 08:40


Due to the current crisis, systems are running are very very slow. Need to be patient I'm afraid.

on ‎09-04-2020 13:10
If it is only system issue, that’s fine I can wait. I was just worried whether I followed right procedure or not. Thank you for all the information.
on ‎11-04-2020 12:57
Hi I really need to change my number due to harassment and abusive calls non stop but no1 is picking up the phone when I call 202
on ‎11-04-2020 13:15
on ‎25-08-2020 00:23
Thank you for the help 👍
on ‎11-07-2021 20:30

contacted o2 yesterday to change number as being harresed to send money to someone in america, was told to switch phone off and on a few times and new number would be avaiable within 24hrs  now sunday night and nothing what next would you advise

on ‎11-07-2021 20:53


Call them again.....

All numbers are in this guide Guide: Coronavirus Community Help and Support