Security - there should not be an option to use another app, like whatsapp, if we haven't set it up. I do not use whatsapp, won't use whatsapp, so please remove it from my verification options. We should be in control of where our stuff goes. If you are seeing an account other than what we have already setup you should say "We noticed you have such and such account, would you like to use it?" That let's us know there is an account out there if we have never set it up then you asking to send verification code there subjects us to possible highjacking of our email.
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