Why iMessage delivered as "Read" but not received
Hello, I would like to ask, regarding iMessage I was sending messages to a friend outside my country we had no problem with it, apparently, he is now in another country for a week, and suddenly my message has not been delivered but the message is blue, not green. Also, I haven't received a message from him after onboarding a plane. what does it mean? can someone enlighten me about this?
[Re-Titled by Moderator]