On Sunday, June 29, 2014 12:38:21 PM UTC-4, Stephen Sprunk wrote:   
      
   >  A normal phone is expected to be usable with zero training, and that limits   
   how complicated the interface can be.    
      
   Every telephone set requires some training to use it.  However, most people   
   get this training as young children, so it is not a big deal to them.    
   Presumably, a kid on getting his first phone will already know from his   
   friends or will learn quickly how    
   to use the various functions beyond merely making a call.   
      
   Years ago, when a town was converted from manual to dial, the Bell System had   
   to send out instructors on how to use the dial.  The at&t archive site has   
   on-line films on learning how to dial--how to work the dial and the   
   explanation of the various aural    
   signals.   
      
   The once-common six-key business telephone set required some training to   
   first-time users, but the functions were simple enough that the training was   
   very brief.  More time was spent on explaining features unique to that   
   particular business, such as    
   intercom destinations and use of different lines.   
      
   Today's modern phones, even modern analog units, have a zillion features that   
   take a few minutes for first time users to learn, beyond making calls.    
   Further, some time must be invested in personalizing the phone's set up if   
   they want, say a custom ring    
   tone or how to format the display screen to their liking.   
      
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