I'm with 3 Mobile, unlimited data. Was paying £24 a month but it's just gone up to £29 a month, SIM only. I can't afford this every month, I'm going to cancel it even though I know there will be a fee attached. I'm only in the contract until September so hopefully it won't be too high.
Just interested to know what sort of prices people are paying, I'd like something with as much data as possible as I use it a lot, minutes and texts are less important.