Transfer your mobile number from O2 to iD Mobile

Leaving O2

How to switch from O2 and transfer my number to iD Mobile

Ask for your Port Authorisation Code (PAC) from O2 customer services by contacting them, either from your 02 mobile phone on 4445 for Pay As You Go, or 202 for Pay Monthly contracts. Alternatively from a landline: dial 0344 8090222 for Pay As You Go customer Service or 0344 8090202 for Pay Monthly customer Service.

If you wish to use the 'text-to-switch' service, simply SMS text PAC to 65075 free from your O2 SIM to request a PAC code by text message and begin the porting process.

  • O2 will provide your Porting Authorisation Code (PAC) either by SMS text message, via email, or over the phone if you contact them.
  • A PAC number is valid for 30 days. If you don't use it within thirty days it will expire and you will need to request a new one.
  • Your O2 online account settings will remain active until your number has been ported over to the new network. After the transfer is complete, your account will be automatically closed.

While you wait for your Port Authorization Code from O2, get the best iD Mobile offer for you. Many of these exclusive mobile phone deals are only available online, directly from the network providers listed here.

Got your PAC code from O2?

Provide your PAC code from O2 to iD Mobile online who will then be able to port your existing phone number from O2. They will tell you what day the transfer is due to take place (usually within 48 hours).

Important: Do NOT cancel your SIM only or mobile contract before switching, otherwise you may lose your existing phone number and be unable to port it over. Once you give your new network provider your PAC code, your old billing account will be closed automatically when your number is successfully ported over.

Note: Credit on Pre-Pay / PAYG (Pay-As-You-Go) accounts cannot be transferred over and so any remaining credit balance will be lost after the switch is complete. If you have any credit left, one good option is to donate it to a charity by SMS text message before porting your number.

Joining iD Mobile

How to switch to iD Mobile and keep my O2 number?

First get your iD Mobile package and activate your new SIM card.

Once you have done that, get the following information ready to follow the step-by-step instructions:

  • Your old O2 mobile phone number you want to keep.
  • The Porting Authorisation Code (PAC) from your previous O2 network.
  • The expiry date of the PAC number (valid for 30 days from the date of issue).
  • The temporary mobile number from your new iD Mobile SIM card activation.
  • You may also need the new iD Mobile SIM card serial number found on the back.

With your PAC code from your previous network provider, log into your iD Mobile account and select My Services then click Keep My Number to enter your PAC code. From there you can select the Port Date and the mobile number you would like to keep.

Alternatively, contact customer services by calling 7777 free from your iD Mobile phone or 0333 003 7777 from any other telephone to provide those details.

Note: You may lose network service for a short period on the day of transfer. If this happens, turn your phone off and on occasionally, until you see the iD Mobile signal on your mobile phone screen. This will indicate that the transfer is complete, and you can now use your existing phone number in your new mobile network provider.

...more info on iD Mobile

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Compare iD Mobile vs O2

About iD Mobile

iD Mobile is a mobile virtual network operator (MVNO) operating in the United Kingdom as iD Mobile Limited, using the Three network. It is owned by Carphone Warehouse and was launched on 12 May 2015.

iD only offers 4G pay-monthly contracts for 12 or 24 months (with a handset) , monthly 30-day rolling or Pay-as-you-go SIM-only deals.

About O2

O2 is a mobile network operator and telecommunications services provider in the United Kingdom, under the company name of Telefonica UK Limited. The company was originally formed in 1985 as Cellnet by the BT Group and was one of the earliest mobile phone networks to launch in the UK, and later rebranded as O2 UK.

02 is one of the largest network operators in the UK and provides 2G, 3G, 4G and 5G services to millions of customers in the United Kingdom, as well as to other mobile virtual network operators (MVNO).