It's never been much of a secret that the Dell Mini 9 has been 3G-ready from day one, and Vodafone customers have been able to get a 3G-equipped model direct from the carrier for a little while now, but it looks like folks in the US can now finally get in on the mobile broadband action as well, with a built-in 3G option now configurable on Dell's site. Unfortunately, anyone that already took the plunge on a Mini 9 is out of luck, as the $125 upgrade is only available new orders (and only available on Windows XP-equipped models). If that doesn't preclude you, however, you can also expect to get a $120 rebate if you're willing to sign a two-year contract for AT&T's DataConnect service, although it looks like you'll also have to put up with a delay in your ship date at the moment.[Via Mobility Site, thanks Chris]