Most devices will come with a voice recording app. Search for “voice” in your apps manager. However a few devices have apps that don’t record in mp3 or m4a. If this is the case, try the apps below
NOTE: Only install apps you trust and with the permission of the owner of the device.
The Hi-Q MP3 Voice Recorder (Free) is an Android app that allows you to easily record mp3 files on your device.
Files are located in the Recordings folder in Internal Storage