You all might be interested in this -
Black 3.5mm HD Mic Retro POP Phone Handset For Samsung Galaxy S 2 I9100
There are a variety of colors to choose from.
It is like the handset from a landline phone, that you plug into the headphone socket (3.5mm)
I normally never have the phone next to my head (I used speakerphone instead).
I have never enjoyed the speakerphone sessions with the Galaxy S2.
This handset is a marked improvement.
It only costs $14 (FREE Postage) <====
I bought two (one for a friend). Both worked.
PS If there were a god, I would ask him for a wireless version of this.
But in the meantime, I will be using this.