Unknown phone number

So, this may not be a subreddit for this, but last night and today, my brother has been getting calls on viber and whatsapp from a Totally random number that's from a different country. I don't know what it is but is it a scam or a hacker maybe? Can anyone help me?

submitted by /u/zargug2
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from hacking: security in practice https://ift.tt/3tPTIWv

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