Is there a requirement for mobile phone to open SMS receipt service?

In order to ensure the basic function of the service, the mobile phone terminal must support short messages, and for better user experience, it is recommended to support flash messaging and WAP. The usage status report of users is as follows: 1. Successful sending: After sending, the other party will receive the SMS immediately. 2. Not sent yet: after sending the SMS, it cannot be sent to the other party in time due to reasons such as power off, out of service area or full SMS space. 3. Sending failed: the other party's number does not exist, or the other party has been turned off for a long time. Off-network users' short message receipt: You can receive the receipt, but because it is a cross-carrier network, the status report can only inform users that the short message has been sent, and cannot provide a real status report. For more service benefits, click "official website" customer service 95 below to answer your questions.