I just bought a used 7610 and a new hdw-3 (bluetooth handsfree).
I keep the handsfree connected to the phone always although the phone seems to have some problems with the bluetooth.
In 1 hour that the handsfree is connected and idled (not used) the bluetooth from the phone is turning to off. I am trying to bring it back to on but it does not goes on. Note that handsfree is still on. When i restart the phone bluetooth is ok.