There's a few apps i'm sure, but i was using DSLR remote lite on my wife's i phone 4 and it gives you all the adjustable settings, whitebalance, etc.  I can't believe some of the shot's the phone has taken, i'll post some when i get home. 
Maybe it's time to trade in my 3G? haha. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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