Now that the phone market is heating up with all kinds of new devices and technology, many companies are finally embracing the iPhone. Can you guess what percentage of iPhone sales are attributed to businesses?

A top Barclays Capital exec estimates that 40 percent of iPhones sold are being used in businesses. And according to the report, some companies are even issuing iPhones to replace the cost of giving employees laptop computers in addition to their in-office machines. How much longer until the iPad takes over?