Just purchased a new Iphone 4 and with that a new service contract. I did not include a provision for "Data" on this phone; thinking that if I wanted to use/send data, I could just use the Wireless (internet) feature of the phone. Of course any "Data" that I use through the 3G network would be billed as extra to me. Am I correct and is this such a good idea; or could I be in for a big surprise when my 1st bill arrives.