Is there any requirement for mobile phone terminal for SMS receipt?

in order to ensure the basic functions of the service, the mobile phone terminal must support short messages, and for better user experience, it is recommended to support flash messaging (direct display) and WAP. Short message receipt refers to the business that customers receive a receipt message immediately after sending a short message with China Telecom's mobile phone. The content of the receipt includes the status information of whether the receiver successfully received it and additional information. The length of the 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 offers, click on the "official website" customer service 218 below to answer your questions.