Many T-Mobile and AT&T subscribers could have been victims of a "SIM swap"

T-Mobile customers purchasing an Apple iPhone from Apple's online store have to enter a four-digit PIN number or the last four digits of their social security number if they plan on financing the device (view image at the top of this article). For some reason, the page used to allow an infinite number of attempts to punch in the correct numbers which made the platform vulnerable to brute force attacks. And once a hacker has his hands on a T-Mobile customer's PIN number, or last four digits of a customer's social security number, he can request a new SIM card tied to the victim's T-Mobile account. ...

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