Hi there
You need to modify the sound settings, select Options > Customize. One of the functions available is :
Volume: Press the Left or Right Navigation key to adjust the volume using the Up or Down Navigation key or volume key on the left side of your phone.
If you have further problems, you can download and save a pdf (Acrobat Reader) version of this phone's manual from here:
Alcatel THE BIG EASY Flip Manual User Guide
Good Luck
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