source: http://forums.macrumors.com/showthread.php?t=1757410
I searched the Internet for hours trying to figure out how to get Hand off and Continuity and phone calls to work. I thought I'd put all that stuff in one place and hopefully save someone the trouble of trying to collect this information themselves.
Initial Steps:
-On your Mac go to About this Mac > System Report. Under the Bluetooth Category your LMP version needs to be 0x6.. Anything lower will not work.
-On Your Mac: Go to system preferences > General > and click the "allow handoff" box at the bottom.