Cellphone via headset ?

In some occations it might be handy to use the cellphone in the airplane,
but the noisy atmosphere makes it somewhat difficult.

I found an ad for an interesting "box" that connects a handphone to the
intercom/headset allowing for better quality communications.
http://www.flightcell.co.nz/flightce...flighcell.html

Any experience out there regarding the Flightcell IV, that also allows for
plugin of a handheld comm-set that might be handy in case of a radio
failure?

I am also aware that some of the newer ANR headsets allows for plug-in of
cellphones.

--
Christian
ENZV