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They aim to trick people into giving up the password that they use to get into their Apple account – and, once hackers are into that, then they can easily get your bank account details, your location, and more scary stuff besides.
Many of those messages arrive looking perfectly innocent, and even useful.
One highlighted this weekend shows a message that claims to be from Google and tells people that their account may have been hacked.
If they want to have it shut down, it says, they need to reply to the message with the 6-digit verification code that they are about to receive.
But they could be incredibly dangerous – and so it’s important to make sure to know how to spot them.
One of the major problems with such scams is that it is now relatively easy to pretend to be someone else, over text.