In Australia, mobile numbers can be transferred to other SIM cards using minimal personal information. SIM hijacking is not a new attack, but there’s increasing interest in stealing phone numbers. In 2018, you can take out half of someone’s financial and business contacts with a successful SIM swap attack, says Richard de Vere, who runs a U.K.-based consultancy, The AntiSocial Engineer, which trains companies how to avoid getting tricked into divulging sensitive information. There’s no movement to strengthen the authentication requirements to request a number port.”]
Source: https://www.cuinfosecurity.com/gone-in-15-minutes-australias-phone-number-theft-problem-a-11552