I lose my phone more often than anything, so the toggle or wow card make more sense to me. Kinda like how you have to change wow to play in China, it would make sense the phone app at least needs some tweeks too. (too much work)
The store, homepage, anything can be changed just scroll to the bottom and set the region.
My desktop always goes to the Korean page, betcause I bought the comp in Korea, but it just takes a second to change it. (however annoying it may be)