Tim Cook has predicted that, eventually, China would become Apple's largest market. So far so good. According to a study by Counterpoint, which is referenced in this post by Marketwatch, Apple’s share of the smartphone market in China rose to 12% in October. This is up from only 3% in September, which is an incredible increase.
Based on the pace of growth of iPhone sales in China Counterpoint said:
This might allow Apple to even reach the No. 1 smartphone player in December or January in China.