Frash, the application that brought Flash to the iPad, has been ported to the iPhone 4 and other iOS 4 devices. The application was tweaked for the suite of iOS 4 devices by Comex, a notable hacker from the dev team who helped launch the original Spirit and web-based JailbreakMe tools for the iOS devices.
This ported application is an alpha build and is reportedly compatible ARMv7 devices which include the iPhone 3GS, iPod Touch 3G, iPhone 4, and, of course, the iPad. Before you jump in head first, you need to have one of the above mentioned devices, iOS 4 or iOS 3.2 (iPad), and be willing to jailbreak the device before starting.
Once you have all your ducks in a row, you can begin installing Frash on your device. The installation process is relatively easy and requires you to download the packaged .deb file, transfer it to the Cydia AutoInstall folder using SSH, and then re-boot your device. In less than 5 minutes from start to finish, you can enjoy the full Safari Mobile browsing experience and the animated advertisements that are offered by a Flash-enabled browser.
As with all hacks, proceed with caution and only attempt this procedure if you are familiar with SSH or can follow directions very, very closely. If you are successful, give us you first impressions of Flash performance on iOS.