It's because the visual voicemail switch is turned on in your phone settings.
Open the phone dialler and go to settings, then voicemail and turn off the visual voicemail option.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues. Please select the post that helped you best and mark as the solution. This helps other members in resolving their issues faster. Thank you.
Can't think of any other reason for it @Deej unless you have an app controlling it?
You could try rebooting the phone to see if that clears it.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues. Please select the post that helped you best and mark as the solution. This helps other members in resolving their issues faster. Thank you.
