How to remove iCloud from an iPhone 5c?

I recently bought this iPhone 5c from a guy. I'm guessing it wasn't reset or removed but it said it was locked to someone's iCloud and now I can't activate the phone, does anyone have any suggestions on what I can do?

You can't, you have to check that before buying as its a security feature in case its stolen

Their must be some way i recived mine from a friend who couldt remember the details

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