I used Cinema4D to model and render the cases. I crowd-sourced old, used phone cases from different phone carriers to get an idea of what the model should look like.

three side
hotspot buttons

combine two hot spots to make one command, or use each individually for a total of three hot spots on the case. or use the buttons tactically to alleviate stress.

up + down
volume buttons

these will come standard for every phone and placement may vary.

the chip inside
the phone case

this chip allows access to the software once the case is plugged into the phone