Apple Investors Question Whether IPhone Growth Has Peaked

Apple’s IPhones Drive Second-Quarter Sales, Profit

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Welcome to the great iPhone debate of 2015: Have sales of the larger-screened phones peaked?

A day after Apple Inc. posted a 33 percent jump in quarterly earnings, shares rose and fell on Tuesday as investors questioned whether Chief Executive Officer Tim Cook can keep iPhone sales roaring and continue to turn in revenue growth in excess of 20 percent a quarter.