Verification in two steps of WhatsApp for iPhone
The verification in two steps ensures access to WhatsApp again in another device, so you will need to not only indicate the security code you receive by SMS, but also confirm your identity through a six-digit code that only you will know.
Two-step verification can now be activated on all iOS devices with WhatsApp installed. It does not require updating since the option appears in the application settings. By activating it, anyone who wants to access your account will need not only your phone number but also a six-digit code.
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