Apple and AT&T today started taking pre-orders of the highly anticipated iPhone 4 that will ship on 24th June. However, as soon as AT&T and Apple started taking the orders today morning their websites were brought down by very high demand for the new iPhone. Even phone support for both the companies is down and customers are getting message that “due to very high call volume we are unable to answer your call.” AT&T premium business customers are not even able to login the website to access their accounts. With this kind of demand it looks like iPhone 4 is blockbuster product before it started shipping.