Somone on ivelt posted a cool siddur for dumbphones (https://www.ivelt.com/forum/viewtopic.php?p=6886500#p6886500) here it is:
A beautiful Siddur for the MindPhone (and many other kosher phones) has been released!
Several key advantages:
- Includes all tefillos for weekdays, tefillos, bakashos, Tehillim, and more.
- A variety of pleasant fonts, including the famous “Vilna” font used in many seforim.
- A very well-thought-out, tested layout designed specifically for smaller screens.
- Setting options for black text on white, white text on black, or to follow the phone’s system settings.
- Relatively small file size: less than 1 MB before extracting the ZIP, and under 4 MB after extraction.
How to use:
Once you extract the ZIP file, transfer the HTML file to your phone (via computer or SD card) and open the file using any file manager app.
Pro tip: Mark it as a “Starred” file for slightly faster access.
(You don’t need to know at all what this is or how it works; just put it on your phone, click the file, and boom—it opens.)