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The transition in the 1990s from analogue to digital technology in cellular radio networks marked a turning point in mobile telephony, heralding a future of ubiquitous, low-cost, personal communications. The global growth of personal communications has continued at an incredibly rapid pace. The commercial pressures in today's markets are such that the development of future standards and systems are driven not simply by technology, but by commercial opportunity and market pull. In this respect personal communications has gone up a gear since the development of the early GSM digital cellular standards. The opportunities to apply PCS technology into adjacent markets and applications are huge, with new products and services limited only by imagination.
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Walter Tuttlebee (1997) studied this question.
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