Fastest growing markets means they came late to the smartphone market and are racing to catch up.
Everybody wants a smartphone and they are pretty cheap these days.
“Fastest growing markets means they came late to the smartphone market and are racing to catch up.”
It also means they are less prosperous markets, because the more prosperous markets do not need to “catch up”. Products are sold to the most prosperous markets first because that’s where you make the most profit. Replacing sales to prosperous markets with sales to less prosperous markets is not an equivalent trade.