Does Backdrops work on iPhone Duo?

Yes. Backdrops is updated for iPhone Duo and uses the full inner display. Owners report it fills the inner display.

Is Backdrops letterboxed on iPhone Duo?

No. Backdrops fills the inner display.

Name: Backdrops - Wallpapers
Author: Christopher Morales

Christopher MoralesPhoto & video

On iPhone Duo

Backdrops fills the inner screen and adapts when you fold.

Owners report it fills the inner display.

1 report from people using iPhone Duo

Most reports are from version 5.5.1.