As someone who worked in cybersecurity for several years I no longer keep very big sums of money at BECU due to this issue. Recently an engineering manager in the Botcoin space got hacked via a SIM swapping attack and they stole $100,000+ worth of bitcoin from him. https://medium.com/coinmonks/the-most-expensive-lesson-of-my-life-details-of-sim-port-hack-35de11517124 With the ease of social engineering phone numbers NIST no longer considers SMS 2FA to be a viable 2nd factor. For most people, bank accounts are the crown jewels of their online accounts and ease of use with online transfers and external accounts can mean high impact to people's livelihood in the event someone is able to login and access your accounts.
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