Ask HN: Why can’t I block all incoming calls that aren’t in my contact list?

Re:Ask HN: Why can’t I block all incoming calls that aren’t ... by wittedhaddock on Wednesday January 30, 2019 @10:30AM (#19035807)

Can you explain phone number spoofing to me? Is there truly phone spoofing that is more than faking the dialer on the client?

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Re:Ask HN: Why can’t I block all incoming calls that aren’t ... by emerongi on Wednesday January 30, 2019 @10:52AM (#19036036)

There is no way for you to verify whether the caller's phone number is actually the real source. Anyone can impersonate anyone. It's like the source address in an IP packet. You can put whatever you want in there.

This is mostly a US problem though. In Europe, the operators tend to be more strict on this, AFAIK.

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Re:Ask HN: Why can’t I block all incoming calls that aren’t ... by umvi on Wednesday January 30, 2019 @10:44AM (#19035950)

You should read the book "Ghost in the Wires" by Kevin Mitnick. It will really open your eyes as to what is possible with phones.

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Re:Ask HN: Why can’t I block all incoming calls that aren’t ... by wittedhaddock on Wednesday January 30, 2019 @10:57AM (#19036101)

can I borrow your copy? I will pay shipping to and fro' :)

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Re:Ask HN: Why can’t I block all incoming calls that aren’t ... by umvi on Wednesday January 30, 2019 @11:58AM (#19036831)

Sure! But honestly, it will probably be cheaper for you to just buy it from Amazon for $8. Or, read it for free using Overdrive (if you have a Kindle/ereader).

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Re:Ask HN: Why can’t I block all incoming calls that aren’t ... by wittedhaddock on Wednesday January 30, 2019 @12:41PM (#19037275)

But this way I get to bug you about my discoveries and compare interpretations with yours... the knowledge comes with instruction hehe

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