throver, I use a mobile dongle (1gb /month) and also a software product called Onspeed (£25 per annum) which enhances the speed and also the amount of browsing you can do per month. I have just renewed my subscription to December 2014.
I highly recommend it to dongle users. (I got a 30% discount 'cos I've used it for (ten) years. (£17.99)
I use it for my dial-up connection as well.