Re: It stupidity anyway
The 24 GHz is only good for point to point links, sports stadiums, auditoriums and open plan offices.
My thoughts entirely. Even on point to point links precipitation attenuation can be rather severe so the link budget has to include a (potentially very) large fade margin; with fixed links a lot of that margin can be obtained by using large parabolic aerials with high gain, but those are not really practical for portable use*.
It also occurs to me that making a handset with enough transmitter power at 24 GHz is going to be a significant challenge; I would expect it to guzzle battery power at a frightening rate.
* This is called understatement.