o2 offer 1 free number change per year @Lilibeyga - for instance, if you are being harrassed or just fancy a change.
Guide: How to change your mobile number
If you want to upgrade, or move from one platform (eg pay as you go) to another (in this example, pay monthly) then speak to the sales team (contact details in the guide Guide: How to find help & contact O2 )
Please note, this is not customer services and we cannot access your account. Do not publish personal details (email, phone number, bank account).
Link to our guide on how to contact them can be found here
