Ok, so I'm thinking about getting one of these tablets, maybe the Samsung Galaxy Tab, and I'm wondering about how this would work. Does anyone know if I would just be able to buy a Wi-Fi version of a tablet and then use the 3g service from any carrier, like Virgin Mobile? They sell these little usb sticks you can plug into a device and use 3g. Or even if I bought a tablet that was under a specific carrier, such as Sprint for example, would I be able to use the 3G stick? Thanks.