Basically, i have an Iphone 3G and i have a wifi set up at home and i know that it does not charge you for using that. But, if i go out say, to work? and use my Iphone there for internet it comes up with the 3G icon in the top corner and I assume it is using that to connect to the internet? So my question is, does that charge me? I don't want to think i'm using free internet and see an extortionate phone bill at the end of the month. I've looked on o2 websites and everything, and nothing seems to tell me, which is worrying because maybe they want me have no information so i get charged! Also, i am in the UK.