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Re:OS X is now macOS and gets support for Siri, auto unlock by reacharavindh on Monday June 13, 2016 @03:19PM (#11896572)
Yes, the Hand-off mechanism works without iCloud involvement or even using your active internet connection. I just tried by disabling Wifi on my Mac and opening up message to continue on a semi written message from my iPhone.

Now, there could always be a iCloud fallback that says if there is internet, just use it. Perks of using non-free software is that it will almost always non-verifiable.

Re:OS X is now macOS and gets support for Siri, auto unlock by ChristianBundy on Monday June 13, 2016 @03:47PM (#11896850)
> I just tried by disabling Wifi on my Mac and opening up message to continue on a semi written message from my iPhone.

How is this possible? Bluetooth? USB? Or are we talking about a previously synced draft that's still there when you turn your internet off? Sounds like a basic iCloud cache to me.

Re:OS X is now macOS and gets support for Siri, auto unlock by masklinn on Monday June 13, 2016 @04:04PM (#11897075)
The original Continuity used bluetooth, p2p wifi (which is also what AirDrop uses), regular wifi and iCloud, some features would depend on a specific substrate but for others it could use several at the same time or switch between them.
Re:OS X is now macOS and gets support for Siri, auto unlock by pvg on Monday June 13, 2016 @04:02PM (#11897048)
Continuity/Handoff works over Bluetooth 4/LE.