Hi, I've got some very beginner questions, that I don't know where to start searching answers for by myself. Hope you can help me out here. Basically, i'm trying to have internet connectivity for my laptop on the move. I am aware of tethering options for my iphone 3g, but I think that will just heat my phone up during prolonged use. Is there anything that I can buy, like a usb modem, so i can plug in my simcard into my laptop? Also, just to hear it for myself, those o2 usb modems for mobile broadbands, they HAVE a simcard in each and everyone of them right? that's how they work isn't it? thanks!