Unfortunately, I think you will be disappointed by the both Sony
Ericsson. Sony Ericsson does not include HandsFreeProfile in
P800 and P900. I recently contacted the Sony Ericsson Helpdesk, who stated that their is no possibility for upgrading for HFP on P800. Still waiting for answer
regarding P900, but I don't think their will be an update.
The best source for information about handsets is the Official
Bluetooth qualification website. http://qualweb.bluetooth.org
Here is an official list of all approved Blueooth devices and
supported profiles.
Please look for HANDSFREE PROFILE. Phones having this profile work
with the Prius (most of the time.......)6310i (with SW V5.22 and
higher), T68i, S55, 3650, 8910i etc.
Just a link to a user forum with comments about the P900 (you'll also
find other phones there)
http://www.expansys.com/forumthread.asp?co...7853&thread=108
Good luck to you all!
/marco