Often the problem is that the tech isn't quite as set-and-forget as you'd like, especially for seniors.
In particular, we need:
* a way to prevent uninstalling and modifying the homescreen.
* a way to prevent the volume being turned down (sooo often, people can't hear because of how they picked up the device)
* absolutely no adverts
* absolutely no prompts. (the device must never ask permission to upgrade, or give notifications of new versions, ...)
* guarantee of no spam - only specific people can call.
In some cases, a way to force the remote end to answer, without it needing any user-interaction (yes this is a privacy issue, it may still be necessary for the elderly).