Why does the SMS receipt open, but the user can't receive additional information?

If the message reception fails to receive additional information, please confirm whether the status report and additional information can be received at the beginning of each day. Only the status report can be received in the afternoon or evening without additional information. If so, it's because there are a lot of short messages sent every day, and the additional information provided by the additional information is about 1 piece every day. This will happen if more than 1 messages are sent in one day. The short message receipt refers to that the customer receives a receipt message immediately after sending a short message with China Telecom's mobile phone. The contents of the receipt include the status information and additional information of whether the receiver successfully received it. The length of additional information is limited to 44 characters (including punctuation marks), and the content involves cultural entertainment, life health, practical knowledge, hot events and other fields. For more service benefits, click "official website" below. Customer service 227 will answer your questions.