I can a bunch of these enquiries here and elsewhere on the net.
I was able to ge my iPhone 4S to pir with tons of devies but so far the only one that works on iPhone5 is my brand new MacBookPro. No joy with either iPad4 or iPad mini - so not tethering working and I am travelling!
ALL devices have been turned off/on and same for Bluetooth in Settings.
Just no functionar!