Because mine broke off, and I can't seem to find just that little plastic piece (3G/3GS) that toggles the silencer on and off. I have to use my fingernail at the moment. 
Anyone know of a site?
	
		
			
		
		
	
				
			Anyone know of a site?
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
	