dannybrito:

The shell phone is not a real thing.

According to Mitchell (in the Yahoo interview), the sea shell smartphone/e-reader was made up for the movie to keep things feeling “like a dream or something outside of time”. In anotherinterview with A.V. Club, he mentioned that having specific devices can make a film feel dated, so they made one up. As he notes, someone will probably make it now. Apparently people keep asking him where they can get one.