Apple usually uses Myriad for everything, from advertising to packaging.

The interface on the iPhone is Helvetica, though, and the OS X system font is Lucida Grande.

And the Helevetica is slightly modified too. The number 1 is an example.

How is the 1 modified? It looks like every other Helvetica 1 I've seen before.

here's helvetica light

there it is!!

:-)

They look the same to me, except on the real iPhone, the 1 is proportional when it's big like that (not at text sizes).