I was roaming and could not access my voicemail messages because I hadn’t set a pin in UK. Today in the UK I tried voicemail and got the message "Service does not allow access to this number” I tried dialling 123 rather than voicemail in phone app.
Also yesterday whilst roaming in France I got an English voice saying "number is not recognised” and yet I had been SMS messaging with the person just before calling When the other person called me back, the call would last between 10 seconds and 30 seconds before the same voice cut in to say "number is not recognised” despite being in middle of conversation.
Are these related and are Three having network issues.