so who's the authority to measure that? there is none because it's impossible to get a real number, you can only approximate these numbers by store use, but you left out the one's that don't, especially in fragmented camp android
It's often, or almost always, done using web site statistics.
Sanrensho is correct on the definition of market share, but the term is often used instead of install base.
On a side note, benchmark scores for iPhone 7 are impressive. Multiple core performance is as high as the Galaxy S7, and single core performance is double that of the Galaxy S7. Apple's new A10 processor is now quad core and can run at 2.4GHz.
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