Change primary number?

[slunat]

I have primary number on my o2 account which i get code to log in but the number is no longer active and I am trying to change it but can't find an option. Does any know how to? 

[jonsie]

You need to contact customer service

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

Guide: How to find help & contact O2