Is the communication between Shanghai and Dong Yun reliable?

Reliable. Shanghai Dong Yun Communication Equipment Business Department was established on April 26th, 2065438. Shanghai Dong Yun Communication Co., Ltd. is a company integrating product sales and after-sales service. The enterprise is legally registered and certified by the Ministry of Industry and Information Technology, and holds formal and legal business certificates. It is a legitimate enterprise, so it is more reliable.