One gray tick means that the message is successfully sent but it hasn’t been delivered yet. That’s not your fault. It simply means that the other person has their phone turned off or that they’re not using the Internet at the moment. … At this point, they’re still not aware that you’ve sent them a message.
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.