If you are interested in writing an app for the Echo, simply head over to the Kyocera Android Development page. According to the site, certain developers will be able to receive a loaner unit of the Echo to help develop applications for the handset. The manufacturer says it has already signed up some big names for its Android developer program.
The web site also shows 4 different modes for the Kyocera Echo. There is the Single-Screen Mode which functions like a single-display smartphone. The Simul-Task Mode allows 2 of the phone's 7 apps to run at the same time, independently, on each of the device's two screens. The Optimized Mode lets a single optimized app run on the dual-screens with compatible features designed specifically for each display. Finally, with the Tablet Mode, one app uses the entire 4.7 inch viewing area of the two screens put together.
While the initial response for the Kyocera Echo was just lukewarm when the phone was introduced, it is something different that might yet find a niche in the rapidly expanding market of Android models.
source: Kyocera via AndroidGuys