I used to not pick up any strange number. When I have a spare time, I googled these strange numbers to see who they are. If they are complained by other people, those numbers will be block.
On iPhone, I use Block Contact feature.
On Android phone, I add to my SPAM - DNA (Do Not Answer) contact that automatic put all calls go to voicemail.
And the best blocking feature I like most, coming from Google Voice / Hangout. Why?



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