I think it is worth pointing out, China has literally 3 - 4x the market size compared to 5 years ago. Apart from India, I think globally all the important market has reached a point of near saturation.<p>The transcript in Apple conference call actually had a question similar. There are still new customers coming into the iPhone ecosystem, but the number suggest that users are now taking slightly longer cycle upgrading their Phones. So while in terms of market usage it is still expanding slowly, the unit sales is flat / stable.<p>For Android this is more of a problem, since there are larger number of people switching to iPhone then vice versa.