title: Initiating Phone Call with a button gives issues when view controller is embedded with Navigation controller
body: <p>I have a View controller with a button that initiates phone call and it works fine. But when i embed this view controller with a Navigation Controller it gives me this error in console " Unable to simultaneously satisfy constraints.
      Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
  (
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  )</p>
  
  <p>Will attempt to recover by breaking constraint 
  </p>
  
  <p>Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
  The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in  may also be helpful."</p>
  
  <p>I don't understand why i get this error because i haven't added any constraints yet. Can someone help?</p>