how do i sync my iphone contacts to my mac?

My iphone contacts and calendar entries do not update my contacts and calendar on my mac. How do I turn this feature on? The iphone-to-mac update used to work when me.com was active. There are settings on the iphone, in itunes on the mac and in icloud that seem to have some bearing on the "sync" process but there does not seem to be a specific guide to transferring contact/calendar entries on one device to the other.