No one seems to be talking about this little feature... Apparently, the 4s is the first mobile phone to feature BT 4.0, it has a real low power draw, and it could be used similarly to NFC. Some questions and thoughts for the knowledgeable on the forums. Questions: 1) Is does BT 4.0 do everything that earlier iterations of BT did but with lower power, or is it only low power for certain functions? 2) With regards to NFC, does BT 4.0 have the same security advantages? 3) Besides, pairing with other devices and possible a payment system, what other things can me done with BT 4.0? 4) Is the power draw low enough that it can be left on all the time with no real consequences? Thoughts: 1) I like the idea of phone based payments - let's hope Apple jumps on this soon, cause if they're going to compete with Google wallet and NFC, they need to act before Google gets too much momentum. 2) The other cool thing I'd like to see is the use of this to allow inter-device picture (or other file) transfer, between iphones or future ipads, when a wifi network is unavailable. And found a good article on the topic.