Note that the quarter where the S3 sold more than the 4s was the launch quarter for the 5: the iPhone (total) outsold the S3 by a moderate amount that quarter.

Note that the quarter where the S3 sold more than the 4s was the launch quarter for the 5: the iPhone (total) outsold the S3 by a moderate amount that quarter. And note that the quarter after that, the 5 and 4s were the two top-selling global smart phone models.