This being Reddit, I try to avoid sales-related messages, but the
$1 may be an option to consider. It has tactile buttons, all menus speak, and has several features beyond making calls if they wish to utilize them.
I know of others where dexterity has made the iPhone harder to use, so thought I'd throw this out there.
Full disclosure: Yes this is my business. For more general info or for people outside the U.S., here's the
$1