Would it be possible to have an app that hangs up by voice command?
Majority of the time, the last thing you say on the phone is Bye or Bye-Bye..
The app would make the phone hang up when these kind of words are said.
I would imagine you would have an option of selecting a particular word or phrase:
See-ya - Say "See-ya" to hang up
Bye - Say "Bye" to hang up.