In targeted attacks, fraudsters are using social engineering techniques to impersonate their victims in calls to telephone service providers. They do this in order to transfer a number away from a handset -- even if only for a short period of time -- and then 'own' the number for the time it takes to grab two-factor authentication (2FA) sent to the phone number and to access a target account, whether this is banking, email, or a cryptocurrency wallet.
Why does it matter? If your phone number ends up outside of your control, this means that 2FA codes can be stolen and any online account linked to this number is at risk of being hijacked.
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