Automatic Mute

• The "Mute" button may also automatically enable on its own because of a faulty keypad or program. You can take the device into your wireless service provider service repair store to test the software and fix the issue for you.
  
  

Stuck on Mute

• The "Mute" button may also remain stuck on mute if the "Mute" button is defective or the keypad may need cleaning. You can clean the keypad by tracing the sharp end of a toothpick between each of the buttons on the keypad. You can also slightly hit the side of the phone on a hard surface to remove any other debris.
  
  

Mute Disabled

• The "Mute" button may disable on its own because of damaged software or hardware in the phone. The "Mute" button may have dirt trapped underneath, preventing the button from depressing all the way and enabling.
  
  

Mute On and Off

• The "Mute" button may periodically come on and go off on its own. This happens during a phone call while you are talking and it sounds like "dead air" in a phone call to the other party.