Nevertheless, it may be important to engineer third-generation handsets to ensure that they cannot radiate high powers when close to the head. Another possible future development is that slow data transmissions, that do not require high powers, could be handled by microcells, whilst high bit rate, high power transmissions could be handled by macrocells. The UMTS forum was suggested as a useful source of information. The introduction of improved technologies that allow more rapid transfer of data will permit the development of new services. At present the mobile phone market is fragmenting, with the youth market a major growth area.
Young subscribers tend to be major users of both voice and short message services.
Handsets aimed at this market are often sold with free headsets. This is done mainly to satisfy customers' lifestyle requirements, although the operators also wish to minimise concern. Another new development utilises the bluetooth protocol to provide local radio links to other devices such as cordless headsets, computers, and printers. This effectively creates a personal area network and will be available next year.