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As a Verizon customer, I didn't realize that my cell phone plan information was being sold to their affiliate marketers. Apparently, this is 'opt in' by default and I have to opt out. I'm sure that I was told about this change in some contract small print. But of course that is a poor justification for such a nasty practice. I wonder if this is why I've been getting so many spam phone calls.
This is so frustrating. But, of course I'm not surprised in the least. Maybe I should finally switch to Project Fi or some other alternative...
How to opt out: While logged in, navigate to (My profile -> Privacy Settings) Or, go to this page: https://nbillpay.verizonwireless.com/vzw/secure/setPrivacy.action
Full information: http://www.verizon.com/about/privacy/customer-proprietary-network-information
Edit: There are plenty of articles out there discussing the recent legislation that has led to an increase in policy changes like this. http://www.popularmechanics.com/technology/security/a25859/how-to-protect-your-online-privacy-from-isp/