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From the Krebs on Security blog

A new breach involving data from nine million AT�T customers is a fresh reminder that your mobile provider likely collects and shares a great deal of information about where you go and what you do with your mobile device – unless and until you affirmatively opt out of this data collection. Here’s a primer on why you might want to do that, and how. Certain questions might be coming to mind right now, like “What the heck is CPNI?” And, ‘If it’s so ‘customer proprietary,’ why is AT�T sharing it with marketers?” Also maybe, “What can I do about it?” Read on for answers to all three questions.