There is no landscape mode for the home screen on iPhone. I don't think there will ever be one because: In portrait mode, there are 4 columns and 6 rows. The bottom row is for the "dock", leaving you with 4 x 5 or 20 spots for app icons. In landscape mode, there are 4 rows and 6 columns. If the system uses that bottom row as the "dock", you're left with 3 x 8 or 18 spots. That means, when you rotate the screen, two apps might have to be bumped off to another screen.
7/9/13 at 1:03pm