Is it free to access iCloud on your iPhone?

I'm just wondering after seeing a second hand iPhone 3gs that i'm tempted to buy, is it free to access iCloud. Also does it take any data away from your monthly contract (E.G If I had 500mb of data would it take away data from that to access iCloud, or is it a completely free service) Thanks!

I know for sure iCloud dosnt cost anything.

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