Apple warns millions of iPhones are exposed to attack

The Apple iPhone is the most popular smartphone in the United States and one of the most widely used devices in the world. An estimated 1.6 billion people rely on iPhones every day. That massive user base also makes the platform a prime target. 

Over the past few weeks, Apple has been sending out warnings about a serious security flaw. New data suggests the risk could affect roughly half of all iPhone users.

That puts hundreds of millions of devices in potential danger right now.

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