I am with 3 because it is cheaper than a lot of the mobile companies and I get quite a lot for the money, unlimited texts and about 500 minutes of phone calls. Even I can't use all that up. :)
Coverage is intermittent and if you are anywhere in the countryside it is non existent. Even at home the signal is limited but you can send a text if you stand on one leg with your arm outstretched pointing your mobile north, then west, then south then east. Three likely message fails out of...