How to read someone's WhatsApp message with a QR code?
If you want to read someone’s WhatsApp messages by scanning a QR code, then you need to have their phone in your hand and scan the code with the help of WhatsApp Web. Once it is done, all their messages can be seen on any other device instantly. But this method can be detected because whenever a new session is established on another device through linked devices, WhatsApp informs users about them.