qThe first two chapters deal with bandwidth and radio. Subsequent chapters look at precursors to the contemporary cellphone, including the surprisingly popular car phone of the 1970s, the analog cellphones of the 1980s and early 1990s, and the basic digital phones which preceded the feature-laden, multipurpose devices of todayq--Provided by publisher.Systems were operating at capacity, leading to busy signals when calls could not go through, and dropped calls when a user moved ... In the space of a few years ATaamp;T Wireless found itself first at the top of the cellular phone business, and then bringing up the rear. ... By 1998, it was the largest cellular phone service provider in the USA, receiving recognition as having the best system and best customeranbsp;...
|Publisher||:||McFarland - 2010-09-09|