With PC and laptops, converting videos to Mp3 online is quite easy with many online converting tools.
Without PCs and laptops, you can download some supported apps to convert videos to Mp3 files like:
- Vidmate (not available on Google Play, you can find it on other third-party sites providing APK files
- MP3 (available on Google Play, multilingual interface and also support other sites like Facebook, Twitter, SoundCloud, ...)
And some other video converters that you can find by yourself on Google Play or other sites.
Good luck!
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s://-mp3.me/fr/fr-2/