I post this to topic to announce a new OS compatible with the Volla Phone!
So, let me introduce Droidian: https://droidian.org/.
Droidian is a GNU/Linux distribution based on top of Mobian (https://mobian-project.org/), a Debian-based distribution for mobile devices. The goal of Droidian is to be able to run Mobian on Android phones.
This is accomplished by using well-known technologies such as Halium (https://halium.org/) and libhybris (https://github.com/libhybris/libhybris).
Keep in mind that this is a work-in-progress and the current available images/rootfs are not guaranteed to be ready for daily-driving.
Installation instructions and downloads for officially supported devices such as the Volla Phone: https://github.com/droidian-images/rootfs-api28gsi-all
Progress of this project can be tracked at: https://github.com/orgs/droidian/projects/1
Main GitHub organization: https://github.com/droidian