(I have no devices with a compatible bluetooth version, so bluetooth does me zero good).
Well it was more about the PC for me, but I guess I can just get a Bluetooth 4.0 dongle and use that maybe.
The iPhone 4 has BT 3.x HW, but a iPhone 4s (IIRC) has BT 4.0 HW. The first version of the Nexus 7 also had the BT 3.x HW, but the second version of the Nexus 7 has BT 4.0 HW (I actually have both versions, and can sync with the newer one)