How do i raise the volume on my iphone 4s when making a call?

When i make a call i cannot hear the person on the other line . When i raise the volume it does nothing . What do I do ?


Answer:
Your phone call might be on mute.
Make a call, and if you still can't hear anything, press the mute button that comes up on the screen, (usually right in line after the Speaker button).

Also make sure nothing is covering your speaker like if your screen protector is on inccorrect that will effect the sound on your Iphone 4s