Here's Why Everyone Is Worried About Apple's IPhone Sales

Apple’s stock took a nosedive this week following the company’s earnings report.

The big scary number? 51 million. That’s how many iPhones Apple sold in Q4 2013. While it’s a record for Apple, it was lower than Wall Street expected (55 to 56 million).

iPhone growth is slowing too, which clearly worried investors. Here’s a look at iPhone sales and growth since 2010 from Business Insider Intelligence:

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