The major problem was the connection between Bluetooth headset and Nokia 6310. The connection is oftenly disconnected or sometimes I have to pair the modules twice or several times. Sometimes Nokia 6310 itself just turn it off by pairing. So I figure that if I am going to have latest model such as Nokia 3650 or 8910, the problem will be solved. Therefore please advise me the difference between Nokia 6310 and Nokia 8910 or 3650(Not only bluetooth module but also phone itself version fit into the buletooth module). Thank you.