Hi all friends out there. I have an iPhone of the 3rd generation with me and I think that the this would be the right time for me to think of buying a iPhone 4. I have no idea about its pricing and whether there are some online stores that can give me a good buy for it. How much is the iPhone 4? Do you guys have any idea about its pricing and what are the different models of the iPhone 4? Do these models differ in their prices? Kindly answer and guide me as soon as possible. Thanks!