![WhatsApp Has a Years-Old Security Problem. Here's How to
Solve It.](https://i.kinja-img.com/gawker-media/image/upload/c_fill,f_auto,fl_progressive,g_center,h_675,pg_1,q_80,w_1200/afb1d64c6cc1813c202d4c10a393f306.jpg)
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Phone numbers are a finite resource. So when one goes out of a service, there’s a good chance telecom companies will reuse it for a new phone plan. That can be a big problem on WhatsApp. In some cases, if you get your hands on a phone number that was tied to an existing WhatsApp account, you can hijack it and assume…
* This article was originally published here
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