Where can I call Hong Kong but I can't get through? What is the success of texting?

Friend, if you send a message with a receipt saying that it was sent successfully, I may conclude that he 100% received your message, because the information returned by the receipt is very accurate. The person who turned off the phone will say that it was turned off, and it was successful. If there is no signal, there will be no signal. If your message receipt says it's successful, it means he must have received your message. Why is the phone disconnected? There are n times the solution, or it may be black. I have 10 years of mobile phone experience, and I hope to adopt it.