Hi
This is the exact problem that the broadband dongles were designed for - yes they do work as I have one myself (trial versions from 3 and T Mobile). Another colleague here has a 3 product also which currently delivers in excess of 3 mbps. Although not as fast as some of the higher end broadband products via fixed line this is a perfect solution for general web users - watch out for the download caps though as some of the cheaper products like 3's £10 Lite only has 1GB of download.
Hope this helps - before you buy check the network coverage in your new address as the speeds delivered will be limited if you are not covered by a 3G service....remember you have 7 days to return the product and cancel the contract if you are not receiving the speeds you want - this is a standard consumer protection measure and the network cannot argue with this
regards
Rob Barnes
Head of Broadband & Mobile
moneysupermarket.com