Several posts a day re this.
Try uninstalling the App, rebooting your phone and then reinstalling.
If that does not work you will need to speak to O2
Message them on Social Media. Facebook (https://o2uk.co/O2CFB) , Twitter (https://o2uk.co/O2CTW) or Instagram (https://o2uk.co/O2CIG)
Or phone them on 202 or 0344 809 0202 (contract)
4445 or 0344 8090222 (PAYG)
This is not O2 and we are all customers here similar to yourself and cannot answer account type queries.
