depends on your contract. My Sony/Ericsson C902 does not have wifi but connects to the net, Vodafone charge me about 46p a day, but only for the days I use it, so for me (I am away from home a couple of days a month) it works out much cheaper than mobile broadband, which I also tried. It is adequately fast for email, DIYnot and stuff. It came with a USB cable to connect it to a PC or laptoy.
Accessing the web on the phone itself is useless, as the screen and keyboard are far too small. It is pretty bad even for trying to read email.