Why using this app? First of all, this is a humble gift to my lover, known with the nick name Kunnie. Secondly, not every Android phone are modern and have plenty of space. The main aim of this application is for using as less as memory as possible, both volatile memory (usually known as RAM) and non-volatile (usually your internal memory or SD card). The entire package takes 245KB of non-volatile memory.
This application is open-source under MIT license. You can get the source code or see more info here: https://github.com/datvm/DKunMessageWall
As you can see, the application only need 2 permission: Startup with system, and Receive SMS. There is no INTERNET permission, so you can be sure that there is no advertisement in this app. However, you can help us developing more useful and completely free by donating through the button in the app, or with this link: