silly question..but it's driving me nuts

is there anyway to use the bluetooth headset option quickly when you
are already on a call w/ someone?

when i first got my 6820, i remember one time i was talking to someone
and i clicked on options and something in the menu said "use bluetooth
headset" and i got so excited and used it. i've never seen it since
that day and it's kind of a pain in the butt to go through the
traditional steps to setup the bluetooth headset when you are already
on a call.

does anyone know how i can set it up quick or am i just missing
something? did i imagine the experience i described above?

thx.
J-