What phone types Korean and China uses

Who also notices that in a Korean dramas they like to use Samsung phones. And for Chinese and Thai they use iPhone. 

I've noticed this, except when you see the BTS it would appear actors have iPhones for personal use.

In South Korea, the most popular phone type is the Samsung Galaxy, with the vast majority of users, especially younger generations, preferring it. While Samsung dominates overall, there's also a noticeable trend of younger Koreans, particularly Gen Z, favoring iPhones. Android is the most common operating system, and even though Samsung is the dominant brand, I've noticed that iPhones are gaining popularity, especially among younger users.