The short answer is a lot. Almost twice as much as in Singapore, or a whopping USD1,340 (THB46,713) on average.
Unsurprisingly , Thailand has the highest-priced iPhone7 in the Asean region, but if you compare prices in PPP (purchasing power parity), Vietnam is even more expensive.
Thai have to work 69 days to buy the latest iPhone, but Vietnamese citizens have to work for more than three months straight, 104 days, to be able to afford the same.
On the other hand, Singaporeans only need a week of work to get their hand on their favourite mobile brand.