Why don’t Apple, Google, or Samsung phones charge faster?

There’s a huge discrepancy in charging between smartphones designed in the US and South Korea and the ones designed in China. If you’re American or Canadian, there’s a good chance you’ve never even been aware — Apple’s iPhone and Samsung’s Galaxy phones are so dominant in the North American market that Chinese brands like OnePlus are a blip, and even Google has struggled to grow its marketshare. There isn’t much in the way of brand migration going on.