It looks just the same as it always was. They’ll be told the message was delivered. That does not equate to it having been read, just like if they sent you a message when the phone wasn’t on DND and you didn’t open messages and read it. As for phone calls, they should go immediately to voice mail.
When you call a dead phone does it ring?
Answer: A: With a dead battery it should not ring but it should go to voicemail directly.