What if i purchase Iphone 4 verizon carrier from amazon and get unlocked in india?

I saw people are selling their used iphones in 200$ which mean 10000. What if i purchase that and unlock it? Will it work in india? Please guide.want Iphone bec i'm in IOS development.studying

smithing like this: http://www.amazon.com/...004ZLYBQ4/

used Iphone for 200$

or anyone can tell me where can i find iphone 4 8gb in 200$

As long as the carriers their use GSM it should work.