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Bob Bauman writing in [I]The Sovereign Investor Daily[/I] (a Banyan Hill publication)
You Could Lose It All by Text Message
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Definitely an issue for Cryptocurrency, but seems more a problem with 2FA using text or social engineering at the carrier. Anything protected by 2FA using text becomes vulnerable if the unsavory can get the CSRs to move your mobile line.
Good read though!
Most exchanges use Google Authenticator or Authy now.