Even though many of these use "Android", it's their own highly customized version of the OS, because open source rocks.
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Ive never even heard of vevo and oppo.
Oppo is parent comp of OnePlus.
I wonder what happened to Huawei.
Huawei is still huge in China and many countries outside US, I guess the chart is US only or purposly ignoring Huawei in the others.
