Remove number linked to another user

[UserAccount]

I'm trying to include my phone number in my account but I can't because it says that this Contact number already associated with another user.

[jonsie]

We’re just customers like you but it sounds like you’ll need someone to access your account which can’t be done from here. If you message O2 using the links below, they should be able to help you with this

or give them a call on 202  or 0344 809 0202