If you wrote on here asking about it then I doubt anything would change @Juliagajda as this is a customer community with no access to your (or anyone else) account.
If you meant to change your number, follow this guide - Guide: How to change your mobile number
If you meant to bring over an old number, follow this guide - Guide: Migration & porting into O2
If anything else, then contact customer services (or provide some more information here, so long as it is not personal details like phone number or email).
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 Do not publish personal details (email, phone number, bank account).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
