Will my iphone model no. MC604B work in India?

Currently using this phone in London and is a contract free phone. Will this model work in india? Or do i need to unlock this iphone?

If the iphone has gsm works it with every carrier http://woikr.com/iphone/here-are-the-prices-for-unlocked-iphone-4s-shipping-in-november/ http://community.o2.co.uk/t5/Apple-iOS-Devices-iPhone-iPad/Iphone-4-on-02-a-cdma-or-a-gsm-phone/td-p/190096

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