Get O2 PAC code to keep my number & transfer to iD Mobile network

Keep my O2 number

How to get a PAC code from O2 & transfer my number to iD Mobile

Request your 02 PAC code from customer services by contacting them, either from your O2 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 get your O2 PAC code by text message and begin the porting process.

  • O2 will provide your PAC code (Porting Authorisation Code) 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 account will remain active until your number has been ported over to your new iD Mobile network. After the transfer is complete, your old O2 account will be automatically closed.

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

Got your O2 PAC code?

Provide your PAC code from O2 to iD Mobile who will then be able to port your existing O2 number. 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 current phone number and be unable to port it over. Once you give iD Mobile your O2 PAC code, your old O2 billing account will be closed automatically when your mobile phone 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.

Transfer my number to 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 that you want to keep.
  • The O2 PAC code (Porting Authorization Code) from your previous 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 as an additional security check.

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 old 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 UK as iD Mobile Limited, using the Three network. It is owned by Carphone Warehouse and was launched on 12 May 2015.

ID Mobile offer 1 month, 12 months and 24 months SIM only deals, as well as 24 month mobile phone (handset device + SIM) contracts, or Pay As You Go SIMs with no contracts or credit checks.

iD Mobile Network Features

2G Network Coverage: No

3G Network Coverage: Yes

4G Network Coverage: Yes

5G Network Coverage: Yes

WiFi Calling: Yes

4G Calling (VoLTE): Yes

Data Rollover: Yes

Tethering Allowed: Yes


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).

O2 Network Features

2G Network Coverage: Yes

3G Network Coverage: Yes

4G Network Coverage: Yes

5G Network Coverage: Yes

WiFi Calling: Yes

4G Calling (VoLTE): Yes

Data Rollover: No

Tethering Allowed: Yes