Hi, I was wondering how to confirm if an imessage that I sent a person 24 hours ago did not actually go through. It does not say "delivered" at the bottom like iMessages normally do, it is definitely an imessage (says imessage at the top and is blue), and when I press and hold down on it, it gives me the option to send it as text. Can I safely assume it has not gotten to the recipient? And if I send it as a text how can I ensure it won't be delivered twice? Thanks!