A Cellular telephone unit should be made that a common regular telephone can be plugged into it. This Cellular unit will have or be plugged into a normal AC power outlet, as it will have to provide common battery for the regular telephone. In this case the cell unit would be some distance from the user and thus would have much less of any possible radiation hazard. Also you would have the option of placing the cell unit near a window where they usually work better. Thus then this would allow for having the telephone any place where just a wire connection or a telephone outlet is located.
The cellular unit could also have adjustable volume and frequency compensations for good quality at the telephone being used.
The cellular telephone unit could also operate with a normal cordless phone which would allow for even more flexibility.
The cost of producing this equipment would not be overly expensive and if produced would provide many benefits.