Apple, for its part, doesn’t appear to even know if a message was sent to a particular number or details on any follow-up conversations — only that at one point a number was typed into an iOS device. … “Because iMessage is encrypted end-to-end, we do not have access to the contents of those communications,” Apple said.
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.