It is illegal to use your mobile phone when driving, but many of us reply on our phones day to day and find it very difficult to be without it even if only for few hours. For some people, their phone is a vital part of their job and they need to be able to take calls when out and about.
Hands free kits have been about for a good number of years now but previously they used to be quite expensive and where often only used by reps etc. May new cars come with Bluetooth now allowing you to link your phone and use it through the car speakers when driving? Not only does this mean you can make and take calls but also that you can listen to your music on your phone in the car.
If you just want a basic hands free kit to use as and when you need it then you can get them from a number of different high street shops and super markets. Even the pound shops sell hands free kits that plug in to an auxiliary port on your cars stereo.