Oh My ! So many choices. Mobile device equipment can include access devices, cases, and mounts along with direct access methods such as styluses , head pointers and switches. There are many to choose from and the best, well that depends… The link below provides an equipment list of some of my favorite mobile device equipment and accessories. For switch access see the resources below.
OT’s with Apps Mobile Device Equipment List (Stands, cases and mounts)
Switch devices, is it’s own specialty in itself , I believe, and not included in the above list. The link below provides a resource list of switch interfaces and apps for mobile devices:
What are your favorite mobile device accessories?