er.. check the title? :Samsung NC10 Intel Atom N270 1.6GHz 10.2" HSDPA Netbook - XP Home - Black (NP-NC10-HAZ1UK) . Most people on the forum have the non-hspda version but the odd few have the sim version
if you google the item name you'll see it's the UK sim version, and trust me I bought one and I've used a sim in it to connect online.
There's some high end sony's that do it too but, what sort of budget are you going for? And do you already have a data package? A lot of these have the sim slot hidden behind the battery, and it's not that easy to remove, you might find it easier (and somewhat cheaper) to buy a non-hspda and get a usb sim adaptor? Depends on what you're looking for