On the next screen, you may get a warning that Java might not run inside your browser: this is not important as we will run Java on the system level. If you’re using Windows or Mac, go to the Java download page and click on the “Free Java Download” button. To make this as straightforward as possible, we’ve outlined all the necessary steps below.
In a nutshell, you’ll need Java and MicroEmulator, in which you’ll run an instance of Opera Mini for J2ME-enabled feature phones. However, as Opera Mini is a proxy browser with limited JavaScript functionality, it’s important you test your site in it. Opera Mini is used by more than 244 million people per month, and for many of them, it’s the only way they can access the internet.
For development and testing purposes, it can be useful to install Opera Mini on your computer.