The BT3030 bluetooth headset is a nice headset but with the iphone the minimum volume is too high.
It seems that a firmware update on the jabra can help a bit.
See http://discussions.apple.com/thread.jspa?threadID=2064373 for the discussion but in brief:
Grab: http://www.jabragn.jp/support/utility/bt3030_firmware_ver1.32.exe
