I bought an 8GB iPhone about 2 months ago. I originally wanted to buy the pay as you go version but when I asked the guy in the O2 store if they would be getting them in he said that the iPhone would only ever be sold on prepay. Low and behold it has now come out on PAYG. My question is.... I have a business phone already so in trying to keep my iPhone bills at a bare minimum i went into O2 yesterday and got a PAYG sim for free and put it into my iPhone. It worked perfectly... obviously because its on the same network, but i've started noticing that my credit is dropping dramatically even though i haven't used it yet. Can anyone tell me why this is happening? I know that O2 are advertising the PAYG iPhone saying that you get 12 months free wifi so is that the reason the credit is dropping. The phone is connected to my wifi so all i can fathom is that that is the reason for it. Also, I got the 8GB black version....I wanted to get the white one but they said that it wouldn't be in the shops for ages because it was sold out so I just settled with the black version. Now that it is in stock I'd like to change to the white version. Is this possible??? I'd even pay the difference between the two. If that is the reason for the credit dropping I think I'll just put back in the Prepay sim card and buy text bundles online from O2 instead. By the way, I'm from Ireland if that helps.