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Do they reuse the old esns
first, the TIA began assigning ESNs in the 80s, when computerized records weren't exactly reliable. and many of the companies they assigned blocks of ESNs to kept even worse records, so the TIA is wary of re-assigning many of these blocks of ESNs unless companies kept good enough records to prove they haven't been used.
second, ESNs are used for billing and security, so no ESN can be used twice. there's no way to safely declare an ESN as inactive once it's been used. and if for some reason it was declared inactive, but then pops up again, there'd be no way to differentiate that phone from a newer model with the same ESN. this is the same problem as the pseudoESN collisions discussed...
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