<P> Installation of hands - free devices in the UK is governed by MPT 1362, which is now referred to as FCS 1362 . A technical document created and updated by the Federation of Communication Services . </P> <P> In Australia, all states have banned the use of a mobile phone while driving unless it is used with a handsfree headset . </P> <P> Since handsfree devices replace a phone's own speaker and microphone capability in a phone call, they now also must deal with the same issues that standard mobile phones and land phones deal with . The main acoustic issues are echo cancellation and noise suppression, although there are others as well . There have been many ways developed to cancel echo in phone calls and results range from poor to excellent . </P> <P> These acoustic technologies must also remove or reduce the noise levels so that the caller is well understood . A person making a call from a handsfree device who is in a busy restaurant or while driving will introduce large levels of noise into the call . This situation is complicated as the software must not only remove the noise around him, but must transmit his voice clearly and loudly to whoever is connected to him . </P>

When can a hands free device be used