What does it mean to make a receipt for telecommunication business?

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SMS Receipt is a value-added SMS service launched by China Telecom for telecom mobile phone users. The original handy short message function is that after sending a short message normally, the mobile phone will immediately display the words "the message has been sent", but this only shows that the short message has arrived at the short message center normally, but it does not mean that the other party has received it. The short message receipt service refers to the service that the system sends a receipt (including a short message status report and a warm reminder) to prompt users whether the short message has been delivered in time!