In FM transmission we use carrier of frequency in the range of kilohertz to megahertz. and in Radio wave transmission we have radio wave frequncies in the range upto 300 GH. We also know that the frequency of bluetooth waves(2.4GHz) is in between the two. Then why is the range of bluetooth technology restricted to small area? can we improve the range of bluetootth transmission by increasing the transmitting power of mobile phones? even though i referred to the friis transmission equation, i could not solve the doubt on my own. will you please help.