Windows 8 and RT bring Windows firmly into the age of cellular-based mobile broadband. Unless, of course, you’re using a Surface. Neither device even offers cellular broadband as an option, which I find amazing. You should be able to buy these things with AT&T or Verizon choices in the US. And I suspect you will be able to do so … in 2013. That said, it’s important to realize that both Windows RT and Windows 8 support native class drivers for USB-based mobile broadband antennas. So you can add this feature, if you don’t mind giving up the one and only USB port.