I have a Cing T650 and use a Plantronics Voyager 510 headset for what it is worth...but....

I am still experimenting but have found that a get better BT reception when the antenna is opposite of where I am with the headset.

At equal distance from the unit, I also find reception is better when the T650 is face down away from me.

Anybody else find this to be true?

Skigs