On iOS beta 4 and OS X Yosemite DP 4 Handoff worked like a charm I was able to make and receive calls on my MacBook Pro, started E-Mails on my iPhone and continued on my Mac. And now since yesterday everything suddenly stopped to work. Tried to disable/enable BT on the Mac on iPhone -> no success. Tried to restart the devices -> no success. Tried to disable/enable Handoff settings on the devices -> no success. Tried to answer to the SMS relay dialog on the iPhone to yes -> no success. Anyone else where handoff also as stopped to working since Beta 5 and DP 5? Thanks.