Only Android 5.1+ Dual Sims Phone due to Google native . Any prior to Android 5.1, do not use it.
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Ringtone Randomizer is easy to use. It allows you pickup any song file as a ringtone. Just a few steps you can set up playlists of ringtones, and get different ringtone after each incoming calls.

- Fast and light app
- unlimited ringtones
- to scan all files in devices, no need to put ringtone into specific folders
- Android 7.1 App Shortcuts features

Work on Android 4.1 - Android 7.1.1