if i am not mistaken, HCB-30 is BT V. 1.1... well, i have noticed that most of the new nokias are having issues with older version of BT, which should not be so, but apparently it is so and besides there are many reports of N73 in particular that are having strange BT behavior... try to update your phone's software/firmware to the latest one using Nokia Software Updater, better yet DL the latest Nokia PC Suite v. 6.82