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It’s not as bad as it might sound since you’ll immediately notice that your account has been disconnected if this ever happens to you (because WhatsApp can only be tied to one phone number at a time).

But using a messenger which isn’t open to this (and more serious attacks), like Threema, is a good idea, of course!


It’s not exactly true. You can choose NOT to allow messages to appear on your lock screen depending upon which handset you’re using.

The simpler, more practical solution would be to have a couple of lines of text preceding the code, e.g.

“The following is your WhatsApp authentication code. Please enter it into the application when requested.


Doing this would prevent the code from being seen in the somewhat minimalistic preview function.


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