User interface 2.0?

Some time ago I bought an iPhone and I must say I love the user interface. It all feels very slick, every function does what you think it should do and looks very nice.
However, I recently downloaded an iPhone app from the NOS that shows you teletekst directly on you iPhone. very convenient.
However, I was wondering myself that it is quite a remarkable that this application for the iPhone is that popular. It is a user interface designed for TV’s with minimal interaction and minimum use of graphics. Of course the original idea was that through this simple view and interface it was easy to use and easy on the hardware. All reasons that are completely not valid on the iPhone platform.
I wonder where the popularity comes from. Is it because people are used for so long to this interface or are minimal interfaces more powerful than we think anyhow? Amazing..