Comcast assigned every mobile customer the same unchangeable PIN to protect against SIM hijack attacks: 0000

If someone wants to steal your phone number — say, to intercept the two-factor authentication SMSes needed to break into your bank account or other vital service — they hijack your SIM by impersonating you to your phone company (or by bribing someone at the company to reassign your phone number to them), and this…
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This is the worst kind of malpractice – I hope no one lost their BitCoin wallet or control of their bank account because of this. There really should be some kind of penalty for companies who put consumers at risk like this, whether or not losses occur.

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