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		 Well, I'll amend my previous remarks and saying it is rude to hang up if it isn't obvious the talking is done now. 
 
So for me it might be: 
 
<ring> 
<phone picks up> 
Hey John, quick question. Do you know X? 
Sure, answer is Y. 
Thanks. 
<phone hangs up> 
 
So, in my opinion that had the indicators that talking is done. But I never said a verbal equivalent of "ok, we're going to hang up now. No, you go first! No, I went first last time, you hang up first this time. Ok, on three! 1, 2, 3 ... you didn't hang up!" 
		
	
		
		
		
		
		
	
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