161af84a_face_Hall_of_Shame___RealPhone__The_Hype
[Our User-Centric View] Put a telephone-type keypad on any application, and the user will pretty rapidly guess that it's a telephone application. Sure, having an image of a telephone handset helps, but it's not necessary. Make the handset a necessary control for the application, and you'll have a lot of users that are unaware that it's a control. Controls should look like controls, and they should appear manipulatable. [The Hype] 
You will not need to guess about what the RealPhone is supposed to do.
Interface Hall of Shame - RealPhone
The Hype