The United States are not the world. I do not know if you get taught that the world also consists of other cultures and countries.
https://venturebeat.com/2016/05/11/android-is-eating-apples-ios-market-share-everywhere/
not to nitpick, but the smartphone market is large enough for there to really be an array of "classes" of phones;
Pointing out that sales of inexpensive smartphones out-strip high-end smartphones is somewhat of a no-brainer.
We wouldn't say that BMW is in a predicament because Toyota sells more Camrys that BMW sells 5-series? would we? Yes they are both cars and both drive, but they don't directly compete with one-another.
in the same vein, a ZTE Maven $99 doesn't directly compete with a $999 iPhone X