I have the Cingular 8125, and spent three days trying to get BT Toggle and its counterparts to run before I found Bt Audio which installed in three minutes and works perfectly. Now I can walk around the office listening to my music without anyone knowing, they think I am either on a call and graciously leave me alone or send me an email. Back on Topic, For some reason the Cingular ROM and Firmware isn't compatible with BT Toggle.