Called on 3 May 2014 at 8:01 PM PST; let ring not even a full ring, then hung-up.
Such as this, when it happens as I've just described, is nearly always a seller of phone lists for robo-calling machines that is robo-calling through its list to see which numbers will ring, and which have been disconnected, in preparation for selling it to someone. Often, a few days after a call that behaves as I've just described, one will receive a call from whomever actually bought the list.
It could also be a buyer of such a list, checking numbers immediately after purchasing said list, so that it can get the seller to refund money for the bad numbers.
Also, remember that if you have a cell phone which has, in it, the ability to block a number; and if you have already blocked the number that called, then a partial ring will sometimes sneak through before the phone is able to stop the call and block the number.
In another forum which deals with trying to figure out who's calling from numbers like this, several posters sa
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