My S8 shows the voicemail icon all the time

[mustang7757]

Hi guys.
Been a month now since I put the new SIM card from BT in my phone.
No more icons saying I've got voicemail, just a message when I get a real one! Doesn't change if I switch the phone off/on.
Thanks for your help and suggestions.
Regards
Brian

So it was a new sim card that fixed it , good to know.