Work gave me a 3G dongle. It's a Huawei E270.
I was a little concerned with support for this under Linux. However, the Vodafone guys over at https://forge.betavine.net/projects/vodafonemobilec/ make a driver for the Huawei modems (the Vodafone dongles use the Huawei chipsets).
Installation was simple. See the site for details.