What is the reason for not receiving the message receipt after sending the message or receiving the message receipt after a long time?

The failure to receive the message receipt after sending the message or the receipt of the message after a long time may be caused by the following reasons: 1, the message receipt is lost in the network transmission process, but the probability is very small; 2, system maintenance, temporarily unable to deal with, such as the system can resume processing after normal; 3. There is a delay in the network, and you will receive a receipt later; 4. You have personalized and blocked some types of receipts; 5. I chose lightning short message and changed my mobile phone, but the new mobile phone does not support lightning short message; 6. The message sent by the calling party to the special number will not receive the enhanced SMS call receipt. When the calling party sends a message by SMS or fetion (the number of the other party is prefixed, such as1065919110), the called party will reply directly, and the called party will not receive an enhanced SMS call receipt, but can only receive it by sending a point-to-point message. You can log in to the SMS receipt official website (website:) and ask online customer service for help, which is available 7X24 hours a day!