nospam wrote, on Sat, 17 May 2014 20:31:52 -0400:

an iphone app can run on the ipad in compatibility mode which is either
original size (i.e., small) the middle of the display or pixel-doubled
to fill most of the display by tapping the 2x button in the corner.

You are the voice of genius!

I had seen that 1X and 2X in the bottom right corner of the iPhone
Google Voice on the iPad, but didn't think anything of it.

When I pressed the 1X, it took up the middle 1/4 of the iPad screen.
When I pressed the 2X, it took up the whole screen.

The only flaw I found in the GUI was that it wouldn't rotate like
all the other apps do.