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Well, I am not going to speak on behalf of cellular technology, but it is common knowledge that with landlines the ratio of phones to available circuits required to draw dial tone is pretty high . . . like 1:50 . . . possibly higher (it has been a while since I was trained on that basic stuff).
Essentially, it means that whenever there is a catastrophe (ie: earthquake, bombing) and too many people reach for their phones at once, it will simply lock up the system, because as everyone knows, the computer's first responsibility is to itself. Getting you dial tone is simply a perk made available as long as the switch can handle its own functions.
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