The Value of Raking Light
The flashlight on a cell phone is a very handy aid when I need raking light to see deboss edges. This often comes up when I'm doing the layout for a blind stamp of a title. If I'm doing foil, I can just strike foil on my layout sheet but I don't want to heat things up when it's simply a blind stamp.
Also, when I'm trying to clearly see the edge of a deboss that will accept a tipped in image or something similar, the flashlight makes things much clearer.
This is much simpler with my ancient phone encased in its blocky cover. I can simply stand it on edge. But you should be able to prop your sleek, modern device up or build a little stand out of a scrap of binder's board.
A Temporary Light Table
We don't all have space for light tables. And windows aren't always convenient to use as temporary light tables (I assume some of you work after dark).
And even if you have a light table, you might be like me and have it covered with many bits and projects. Your current need for the tool may not justify cleaning it off.
In such cases I use two bricks (covered with archival corrugated board), a piece of plexiglass, and my cell phone flashlight to make a temporary light box.