unknown symbol on my home screen

Grabbed my phone (bold) the other day and depressed multiple keys in the upper right quadrant of the keypad, now I have a new symbol on my calling out screen. No idea what it is or why its there. Its near the upper right of my screen and its a box with shapes (diamonds?) Diagonally crossing it. It disappears when I have the phone in hands free mode. Any ideas?

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Sounds like Enhanced Audio:

maybe u can restore settings to default to make it disappear???

Not necessary to reset. Next call, press the L key. That's all it takes.

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