couldnt afford to have a hands free installed so I made my own.
I bought a pc conference microphone and 3.5mm audio splitter from maplin . I already had a standard audio lead. removed glovebox in my focus removed av socket , plugged standard av lead into it and fed wire behind dashboard and out into storage area under stereo . Stuck microphone on to dash with supplied small sticky pad , fed wire into same storage area . connected both wires to splitter , single jack end in to phone ( iphone 5s ) I have enough wire to put phone pretty much wherever i want , and when not in use the wire is stored out of sight behind the storage area door. Works great (have to have stereo on aux , but that doesnt bother me as i always listen to music from iphone anyway ) incoming calls come through the speakers and i have auto answer active on my phone so it automatically answers after 3 rings. Totally hands free. probably been done before , but well proud of myself lol. The microphone is very small and unobtrusive but is great , i dont even have to raise my voice !
saved a packet !