At my house, elderly people answer the doorbell when visitors arrive. Sometimes they forget to hang up after the call, and the sound from inside the room gets amplified through the doorbell. I tried using a smart action to have the call hang up after a set time, but there's no action to hang up the call.

I use an old iPhone exclusively as a doorbell. I'd like a simpler screen mode that only lets you answer and hang up so that even elderly people won't accidentally operate it.

Thanks.