There has been a lot of public concern around the world about potential health effects from using mobile phones. This concern has spilled over to other cordless phone technologies and indeed to many other devices that transmit radiofrequency energy.
Scientists have been studying possible health and biological effects of radiofrequency energy since World War II and even before, and the literature at this point is very large. Since the 1990s many studies have been conducted on possible health effects of mobile phones. I am not aware of any studies that have searched for possible health effects of DECT phones specifically, but DECT phones operate in a generally similar frequency band and at similar average power levels as many mobile phones.
Health agencies around the world have repeatedly examined the scientific literature and have found no clear evidence of health effects from use of mobile phones, or indeed from any exposures to radiofrequency energy at levels below international exposure guidelines. But these agencies also point out the limitations to the data (for example, lack of data regarding long-term use of mobile phones) and they all call for more research. The most recent report on this subject is by a group affiliated with the Health Protection Agency of the United Kingdom (U.K.) (http://www.mthr.org.uk/documents/MTHR_report_2007.pdf).
Some activist groups (such as the one whose website you cited) claim that there are health hazards from mobile phones and other sources of radiofrequency energy at levels below international exposure limits. Such claims are not reflected in opinions of health agencies including the U.K. Health Protection Agency, the World Health Organization, and other major health agencies.
That said, if a person is concerned about possible health effects of a cordless or mobile phone, he or she might consider using a hands-free kit (which reduces exposure to the head) or simply not use such a phone at all.
Kenneth R. Foster, Professor
Department of Bioengineering
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WHILE RESEARCHING A NEW CORDLESS PHONE TECHNOLOGY (DECT [DIGITAL ENHANCED TELECOMMUNICATIONS] 6.0), I SAW REFERENCE TO POTENTIAL BRAIN DAMAGE AND/OR CANCER DUE THE RADIATION FREQUENCY AND PULSES FROM THESE DEVICES.