A: Yes, but poorly. Older versions have buggy video calls. Newer versions are slightly better.
Jio Phones do not run Android. They run KaiOS. Therefore, Android APK files will NOT install on a Jio Phone. Attempting to sideload an APK will fail or corrupt the device. A: Yes, but poorly
A: Yes. KaiOS 2.0, 2.5.1, 2.5.4 all support the same .zip installation method. A: Yes, but poorly