Cẩm nang dữ liệu không dây P9

SUBSCRIBER GROWTH: HISTORY AND BARRIERS APPROACH Each public service provider has a different philosophy on reporting subscribers. Not unexpectedly the most successful, OmniTRACS, is also the most forthright about both customer names and device shipments, though one must take care to discriminate between U.S. and worldwide totals. ARDIS is good at overall subscriber counts, a bit more guarded on customer names and their specific active devices. .or years RAM was very guarded in both respects, but in 1996 it began to reveal gross subscriber count summaries. User names, and especially quantities for those users, were more difficult to obtain....