Can I exchange my iPhone 4S to iPhone5 in india

I bought white iPhone 4S factory unlocked 32GB on 7aug2012 for 50,000 INR i.e 907 USD

Now I want to upgrade to iphone5 which in our market starts(16GB) from 45000 INR i.e 816 USD

is it possible to exchange my iPhone 4S with iPhone 5 ??

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