Can someone share iphone 4g release date?

Apple has launched iPhone 4 last month and it is widely launched in whole of the USA and is coming up with two AT&T and verizon. Although I am having apple iPhone 3G right now but I am also planning to go for this next product from the technology giant. I have heard that a lot features have been upgraded and included in the phone so this will be a thrilling experience to buy this mobile. This time apple has made the phone more longer and less thinner than the previous phone and some of other features includes Some more features includes voice control, voice memo recorder, assisted GPS and Google Maps, Safari browser, access to apps and media through iTunes, and FaceTime over Wi-Fi. iOS5 also make it more fast and easy to process. The price is decided $199 and is coming up with verizon and AT&T but I would prefer to go with verizon as it also offering international roaming. Thanks.