A Java applet is a program written in the Java programming language and embedded into an HTML web page. The iPhone does not feature the native ability to view Java applets. It is, however, possible to view Java applets on your iPhone by downloading and installing the Cloud Browse application. Cloud Browse is a paid application and alternative web browser available through Apple's App Store. Cloud Browse is the only application available for the iPhone that will allow you to run Java applets.
Tap the "App Store" icon and select the "Search" icon. Type "Cloud Browse" in the search bar and press the blue "Search" button. Select the "Cloud Browse" application. Press the blue "$0.99" icon and then tap the green "Install" button. The App Store will automatically download and install the Cloud Browse application on your iPhone.
Tap the "Cloud Browse" icon.
Type the full website address for any site that contains a Java applet in the search bar of the Cloud Browse application. Press the blue "Go" button. The Java applet will automatically load in the web page. If the Java applet is interactive, you can use the Applet as you normally would using a traditional computer.