How do I get rid of this icon on my AT&T landline?
My AT&T landline phone has this icon on it and I can't get it to go away. It says there's a new voicemail, but going through the normal way to listen to it, it says there's no voicemail. The icon has "ECO" on top of an envelope with "VM" in the envelope. What is it and how go I get rid of it?