The icon like the ear with a backslash across appears on the bottom of my Nokia E5 screen, how do I disable it?

Select Menu > Ctrl. Panel > Settings > General > Personalization > TonesT-Coil hearing aid mode > Off.

The icon is the Hearing aid symbol. It is located on the bottom of the Nokia E5-00 screen. 

Note! The SIM card must be inserted and profile should not be offline when you disable the icon.