@emptywheel Maybe because in the old days, there was only AT&T, so there was one-stop shopping for multihop analysis? Just a guess.
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Replying to @charlie_savage
@charlie_savage That could very well be (though timing may be more recent), but the 18 month retention rule came later.1 reply 0 retweets 0 likes -
Replying to @emptywheel
@emptywheel True. But AT&T 2.0, which seems to be owner of legacy Ma Bell's backbone switches, was already holding onto decades of data.1 reply 0 retweets 0 likes -
Replying to @charlie_savage
@charlie_savage True. AT&T did and still does hold onto everything. So assuming they got it just from AT&T, no need for other Baby Bells?1 reply 0 retweets 0 likes -
Replying to @emptywheel
@emptywheel That would capture lots but I don't think comprehensive - eg a Verizon Wireless customer calls another Verizon Wireless customer3 replies 0 retweets 0 likes
@charlie_savage It'd be interesting to do snapshot from 1985 (very likely time for call chaining) and from 1988. Interesting Q.
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