I use a Kensington dongle. But beware....your phone may not be able to transfer files. At the moment, only Cingular and T-mobile allow their phones to do the BT file transfers, and even then, T-mobile puts a limit on what you want those files to do (i.e. custom ringtones). Verizon does have phones with BT, but disables the transfer capabilities in the firmware. Does your phone support OBEX and push-file transfers? If so, you're golden.