More good news for prospective Vodafone users, as they drop their 3GB/month data plan to £15 (reports SMS Text News). It's a long contract (18 or 24 months) but it does come with a USB 3G modem.  No word if this will be available to existing users with data enabled handsets, but it's a sign that data pricing is definitely on its way to becoming a commodity, rather than a luxury, on people's monthly bills.