Apple probably needn't worry too much, though, as analysts explain the slump as caused by Chinese customers waiting for the .

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More worrying for Apple is the suggestion that Chinese customers are looking elsewhere to due to the similarity between the and .

"There are two things in play," said IDC analyst TZ Wong, referring to Apple's drop in ranking and market share.

"One is seasonal, people know the new phone is coming. And the second is that the alternatives are becoming much more attractive than a year ago. The iPhone didn't change much over the year."