Your device uses sounds and vibrations to notify you of some events, using ringtones, notifications, alarms and navigation feedback. You can customize any of these sounds, as well as control their volumes.
1) Change default ringtone for incoming calls.
a) Touch the “Settings” icon from the Home screen or under the main menu.
b) Touch “Sound & vibration”.
c) Touch “Phone ringtone & vibrate”.
d) You will see a list of ringtones.
e) Touch a ringtone to select and hear it. Or you can touch “Custom ringtone”, choose an MP3 you like from music app and touch “DONE”.
2) Adjust volume for incoming calls.
a) Touch the “Settings” icon from the Home screen or under the main menu.
b) Touch “Sound & vibration”.
c) You will see a Volume Bar. Drag to adjust the volume.

Note: This Q&A question does not apply to the Wi-Fi version of the tablet.
Available settings and menus may vary depending on device model and software version.