WARNING! WARNING! WARNING!
The addon Jonbad is talking about is for use with the internet on your PHONE only, i.e. not as a modem. For that you will pay quite a premium for anything you download via the modem.
There is, however, a Â£10 option which allows you 10GB/Month of internet, which seems very reasonable. I use it with a Nokia 6120 classic (HSDPA) and am very pleased (small and cheap, if it breaks/get’s lost, get another). I need to use usb to get super fast internet, but bluetooth 2.0’s EDR speed is quite ok for me. I can watch you tube etc as much as I want with no hiccups so just don’t see the need for faster. Maybe others can, but for me this is just fine.
But beware, re my main point, you will be billed to high heaven without the right addon. Make sure you do.