It was once
so simple - you just clicked your phone into the hands-free car kit...
Which is why so many business people are still loyal to their Nokia 6310i / CARK-91 combination, even though the phone has been out of production since 2005! In fact you will have to pay around £100 for a top quality refurbished Nokia 6310i from a specialist dealer and about £80 (less fitting) for the CARK-91.
Phones that are phones and don't have all the i-Fad gadgetry are hard to find these days; as Jeremy Clarkson once wrote "Mobile phones seem to be designed for teenage girls these days".
Good old 6310i - batteries last for ever between charging, it seems, particularly if you use the car kit a lot. I met a Vulcan display pilot the other day who is now on his 4th Nokia 6310i mainly because of the ability to use it seamlessly in the car kit.