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A comment on Ask HN: Why can’t I block all incoming calls that aren’t in my contact list?. Parent comment

Re:Ask HN: Why can’t I block all incoming calls that aren’t ... by pbhjpbhj on Wednesday January 30, 2019 @10:21AM (#19035711)
In UK some of the call centres use a fake local number.

It seems to me that phone companies can detect that, but they don't want to reduce the number of calls, do they?

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