That’s where the switching number comes into the picture. This Scenario 2 is shown in the figure above and suggests that although Android gained 8 million new users, it lost 6.4 million to iPhone for a net gain of 1.6.
Apple may have also lost a few users to Android but overall gained switchers from other platforms, mainly Android. This is what would support Tim Cook’s comments.
Thinking further ahead, as the markets mature globally, they may well evolve into the way the US market evolves today. Apple’s brand promise ensures loyalty while competing platforms slowly “leak” users. If this sounds eerily familiar then you’d be right. This is exactly how the PC market behaves today.
—The new switchers, Horace Dediu