https://techcrunch.com/2019/08/02/a-closer-look-at-chinas-smartphone-market/

In February 2013, China surpassed the United States to become the world’s largest smartphone market. More than half a decade on, it still proves an elusive target for international sellers. A glance at reports from the past several shows reveals the top spots dominated by homegrown names: Huawei, Vivo, Oppo, Xiaomi.

Combined, the big four made up roughly 84 percent of the nearly 100 million smartphones shipped last quarter, per new numbers from Canalys. Even international giants like Apple and Samsung have trouble cracking double-digit market share. Of the two, Apple has generally done better, with around six percent of the market — around six times Samsung’s share.