Mute Button Missing? I upgraded to a Samsung Galaxy S4 from an iPhone 4 today and have been setting various settings. When I first made a call there was a mute button in the middle bottom of the screen. Now, after I have changed settings, there is no more mute button. 

I am at a lost as to what I changed to make my mute button disappear. 

What do I do to see the mute button?

Note: I am referring to muting my phone during a call.
Try this  

1.Settings > tap Home Screen Mode > select standard mode
2.Tap apply and reboot.