Why does AirDrop between Mac and iPhone require iPhone 5? Downer!
So Apple recently began to publish very technical details to OS X software updates, as shown here.
I think my question merits an answer seeing that my iPhone 4s handles the latest iOS and as a programmer/product manager I can't see any obstacles other than bluetooth bandwidth may be slower.
BTW, PS I think its unwise or at the least foolish that Apple would post sensitive details about security updates.