How to activate Mono audio in Samsung Galaxy Grand Neo(GT-I9060)?
STEP 1. GETTING STARTED
a). Tap on Apps icon as shown below.
b). Now hold and swipe the Application screen towards left and then tap on Settings icon as shown below.
STEP 2. OPEN ACCESSIBILITY OPTIONS
c). Tap on My device tab from Settings.
d). Now tap and drag the screen upward then tap on Accessibility option from the list.
e). Now tap on check box next to Mono audio option as shown below.
Now you can switch audio from stereo to mono for when you are using one earphone.