I have a 3G iPad 2 and I'm using a prepaid data plan. I wanted to share the 3G connection with my MacBook Air but I cant seem to tether it using Bluetooth. Ive tethered using my iPhone 3GS before. Shouldn't I also be able to tether using my iPad 2 3G? I need to send an email with an excel attachment ASAP but I have no wifi.