Constant stream of spam text messages. Why is it happening?

I have, for the past weeks, been receiving random text messages (SMS) containing media files (I de-activated the automatic download, I don't know what is in them).
The numbers come from my country (Canada). Sometimes, the same number calls, then they hung up. when I call them back, it's a person who has no idea that his or her number has been used to send a message and call.

Can anybody explain to me :

What is the purpose? what is the technique name that is used.

what can be done to prevent or change that.

submitted by /u/meben40
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from hacking: security in practice https://ift.tt/chmiLOP

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