@Stevekg
A couple of things to check first.
1 - Do you have idata enabled, or, does visual voicemail work.
2 - Have you got WiFi calling enabled?
If yes to both, you'll need to call O2 to look at your account.
Guide: Coronavirus Community Help and Support
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.
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