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Not sure how joining in a Whatsapp group (now called Communities) would lead to the problem Lindsey described. Might just be a coincidence. However, you can change how you are added to a community under the Whatsapp settings so that only your contacts may do so. Also, you can further secure your account by requiring to periodically enter a 6-digit PIN to access your Whatsapp. If someone does manage to hijack your account, they won't be able to access it for long.
As I suspected, and from what I can find , you would STILL have to Give someone the CODE which then comes back to the ORIGINAL Phone number .
So they cant just take over your number by installing software alone . even if you click on it .
So , its the same as if your BANK wants you to Authenticate , by texting you a CODE, and then you ENTER that Code into your Log in .
Unfortunately, This Teacher in one way or the other " Participated" in this Scam by giving them this Crucial Info .
I dont see how its possible to take over her Phone # any other way other than by giving out this Whatsapp Authentication.
The Sad part is , her original Number is now associated with this Scammer on Whatsapp.. I dont think that can be reversed until he gives it up.
My question is did she have whats app with that Same Number before this ,
I highly doubt it . its another Scenario i do not see playing out either .
She most definitely got a Text, while " signing up" and then gave that Info to another person , who contacted her from her Friends Group or claimed was " helping her" to set it up.
Be careful .