didnt your phone come with that 'Y' shaped adapter? all u need is that and a cheap audio cable. they sell cables that are 2.5 male to 3.5 male. My alltel 6800 came with a base station while my friends verizon xv6800 didnt. i also got 2 sets of headphones, my friend got 1. all my stuff was in the sealed box my phone came in.
also, see this post if u want more info on the usb port:
http://forum.ppcgeeks.com/showthread.php?t=22654#10