What does the test message on July 27th mean?

Refers to the test message sent on July 27th.

According to the query of Global Network School, the test message on July 27th usually refers to the test message sent on July 27th to verify the function and reliability of the SMS notification system. This test usually includes sending a short message to the designated recipient to check whether the short message can be sent and received accurately and timely.

Short message is a telecommunication service in digital mobile communication system. It is a non-real-time and non-voice data communication service to transmit text or digital short messages through the signaling channel and signaling network of mobile communication system.