In response to the very good deals being offered by 3 and T-Mobile, Vodafone has cut the cost of their mobile broadband service from £30 a month to £15 a month. They offer blistering download speeds of up to 7.2mbps and a choice of contract lengths - 12, 18 and 24 months. At 12 months, you pay £99 for your modem - at 24 months you get it for free.
If you don't fancy an ongoing contract, they also have a "30 day" option which is similar really to a pay as you go scheme. That option is £20 a month, and again you pay £99 for the modem.
Find out more about Vodafone's new competitive price plans for mobile broadband.