Hi, let me cut to the chase. I know it's possible to tether an iPod Touch to any Nokia cell phone via Bluetooth to use the cellphones data network. I know this because I've done it. I just purchased an iPhone 5S thinking that I could tether to my phone just as I normally would with any iPod/iPad device. After I pair the two devices via BT, I get an error message saying "Device Not Supported". This message usually appears on both the Nokia and iPhone. The iPhone 5S does not have a sim card in it. I plainly want to treat the 5S as a glorified iPod Touch. What I'm wondering is why can't I tether to an iPhone 5S, but I can tether to any iPad, or iPod Touch? Just to be clear, yes I do tether over Bluetooth. If anyone is curious, I purchased the iPhone 5S over the new iPod Touch because of certain lack of features the new iPod has.