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Apple and Samsung aren't the world's top two smartphone vendors for once
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
Xiaomi isn't actually that big in China AFAIK. There is a lot of competition, not just from Apple but all the other Chinese vendors, most of whom are larger. Huawei, Honor, VIVO and Oppo all have at least an equivalent, if not larger, segment of the Chinese market.
I don’t know what it looks like now. In 2019, at least in one of the cities I went to, it seemed like everyone had a XiaoMi