if you dnt find out how to turn the microphone up on the n810 you can also take a look at the "Stereo" Bluetooth headsets with mic's built in for phone calls, its what I intend to use when i get my n810. no wires or anything just pair it and go..

http://www.google.com/products?q=ste...eadphone&hl=en

The pair I plan to use "specifically" is the Altec Lansing BackBeat 903 which got an excellent review from Cnet: http://reviews.cnet.com/headphones/a...&tag=mncol;lst

and the 906 version comes with a "dongle" to enable non Bluetooth devices... http://www.fadfusion.com/selection.p...er=20029003237