Since the 2 iPhones receiving the same message at the same time is caused by using the same Apple I.D on multiple devices, you only need to have a separate AppleID set up in the Messages and FaceTime app to fix this issue. … Go to Settings > Messages > Send & Receive.
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.