RegHardware: "Unlike the Advent 4213 we reviewed recently, which also comes with HSDPA and into which you can slip any old 3G-enabled SIM card and surf away, the situation with the Mini 9 is a little more complicated. Although you can order one direct from Dell for £269 for the Linux version or £299 for the Windows XP flavour, neither comes equipped with 3G.
If mobile internet is what you're after, then your only option is to get one from Vodafone. On the plus side, the carrier will give you the Small, Cheap Computer for free. In exchange, however, you'll have to promised to cough up at least £25 a month for the next two years, which works out at £600 minimum for the 1GB-a-month deal. If you need to transfer 3GB a month then the £30-a-month commitment will cost you an additional £120 over the life of the contract."