Across the world, the biggest smartphone manufacturers are Apple (28%), Samsung (24%), Xiaomi (12%), Oppo (6%) and Vivo (5%). However, there are geographic patterns in popularity, with Apple dominating North America and East Asia, while Samsung leads in South America, Europe, Africa and West Asia in addition to its home turf of South Korea. Xiaomi is the most popular phone brand across South Asia, Spain, Venezuela, Ukraine, Madagascar, Kyrgyzstan and Palestine, while Tecno is popular in West and Central Africa. Oppo, Vivo and Huawei lead in Indonesia, Bhutan and Togo respectively.
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I don't think SMIC refuses to sell to non-Chinese companies. Nokia mostly uses Unisoc chips, which are made in China (not sure if by SMIC).
But if they did, it would be a pretty serious problem, since I don't think SMIC even has a viable competitor in the entry-level smartphone chip market.