Will PRISMO work with my smartphone 

-PRISMO has been tested on today's most popular smartphones. PRISMO works best on smartphones with the front-facing camera offset from the body's perimeter (iPhone), as PRISMO is more secure. On smartphones where the front-facing camera abuts the body's perimeter (some Galaxy models) 
PRISMO is less secure.
Will PRISMO work with my smartphone case
-PRISMO works with most smartphone cases. There exist some obtrusive cases which prevent PRISMO from properly engaging with the front-facing camera
Do I need an app to use PRISMO
-No, PRISMO works with the camera app provided with your smartphone, as well as many third-party camera apps.
Can I use PRISMO on the smartphone rear facing camera also?
Yes, however this is not ideal for a couple of reasons. One, this would not allow the smartphone to lie flat when using hands-free ('balancing' on PRISMO is not recommended). And two, the live image would not be correctly oriented - it would be inverted or appear upside down. The latter could be managed with an app (like COVR photo) or post-processing, but that it is not in the spirit of PRISMO's simplicity. However, feel free to experiment with PRISMO - that is what this is all about!