That lays the groundwork for the kind of debacle AT&T faced not when it put iPhones on its network without being ready for either the number of subscribers or amount of data each used.
The performance problems were severe, complaints were frequent, and AT&T's reputation hasn't recovered yet. (Its service hasn't either, though it has improved quite a lot since then.)
Verizon has managed to avoid that crunch so far, but then it hasn't had to deal with the twin curses (to a network manager) of an upgrade to much bigger pipes and an influx of new users on new devices that may suck away every available bit of bandwidth as fast as it's put on the air.
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