Though Apple does not disclose the revenue it generates from each product category by region, it is not hard to guess that the iPhone is the most important category. And, this is where the Chinese companies are hurting it. Huawei's smartphone market share in the People's Republic of China increased from 16.4% in 2016 to 20.4% in 2017, while in the same period, Apple's share dropped from 9.6% to 9.3%, according to market research company IDC.