The short message was not received successfully. Why does the integration platform display error code 5?

5 should be the code of Unicom, and the parameter format is wrong, indicating that the parameter value in the command does not match the parameter type or range specified in the agreement. This is the explanation given by the operator's code table. It is suggested to find a reliable and responsible platform, such as Haoyu Information Dissemination, 238, etc. If it fails, they will have a solution.