i wanna get the iphone. is it possible for me to just walk into the store and buy one with cash? my parents said i can get it, but they wont buy me phone service cause i already have a cingular phone with a 2 year contract. so if i buy the iphone without buying phone service, can i do anything with it like internet? and will they allow me to buy it without just like that witout a getting phone service on it? thanks