Comment on How we store 400M phone numbers with fast lookupparentComments−20kleagues11yIf it is opt-out, then won't they have just the list of people who don't want phone calls?−maerF0x011yassuming a saturated numberspace, 400M numbers is just 5% of all possible #s . I doubt that the exceptions (911-xxx-xxxx) reduce the number enough to make a whitelist a better choice.
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If it is opt-out, then won't they have just the list of people who don't want phone calls?
assuming a saturated numberspace, 400M numbers is just 5% of all possible #s . I doubt that the exceptions (911-xxx-xxxx) reduce the number enough to make a whitelist a better choice.