The cellular radio business has expanded explosively since 1980 and continues to
expand rapidly. There are several explanations for this popularity. It adds a new dimen-
sion to wired PSTN services. In our small spheres of everyday living, we are never
away from the telephone, no matter where we are. Outside of industrialized nations,
there are long waiting lists for conventional (wired) telephone installations. Go down to
the local cellular radio store, and you will have telephone service within the hour. We
have found that cellular service augments local telephone service availability. When our
local service failed for several days, our cellular telephone worked just fine, although
air time was expensive.วิจัย