A system and method for displaying a customized banner on a wireless communication device (WCD) indicating call quality. A WCD operating in a wireless communication system that include a first base station can receive from the first base station a first message that includes a first specific indication confirming that a particular mode of high quality voice communication has become active on an end-to-end basis for an existing voice call between the WCD and a different WCD operating in the wireless communication system. In response to determining that the first message includes the first specific indication, the WCD can a particular icon signifying that the particular mode of high quality voice communication has become active.