OP might have consulted a Chinese issued map :) Supposedly, about a third of Samsung phones are produced in Vietnam https://e27.co/1-3-samsung-phones-made-viet

OP might have consulted a Chinese issued map :) Supposedly, about a third of Samsung phones are produced in Vietnam https://e27.co/1-3-samsung-phones-made-vietnam-20150513/ https://e27.co/1-3-samsung-phones-made-vietnam-20150513/. Some googling shows me that Taiwan, Vietnam, South Korea, Japan and India have significant share of smartphones produced (one example https://www.androidauthority.com/where-smartphones-are-made-707989/ https://www.androidauthority.com/where-smartphones-are-made-...).