thanx for the answere (headset from sony ericsson) first time : connection with btheadset ok . all ok . i can all . phone , mp3 ..... WITH THE HEADSET AND NON : when i switch the bt system from the phone off , or switch the btheadset off AND later ON then start the phone the mp3 player and show error "connection" ---> i cant find the headset not more (searching bluetooth) i must delete the headset and switch off the phone . AND all new searching and connecting . then go the headset !!! only 1 time . then the same process .....and and and i think the problem is , that the phone lost the connection with the headset !