The best place to buy second hand smart phone is this website.
where you can buy all smartphone with really good price..
For example those people who are selling their Galaxy s2 here for 140-170000 won that same product you can buy on above website in just 80000 -120000won and its same for all product. Please check once befor you buy any expensive second hand phone..
I am just posting this ad so some people can get best deals..