I send short messages in groups … Who knows the allowed sending speed of Unicom and Mobile per hour?

You should use the local short message gateway, but what I want to say is that for short message sending, web protocol is used now, and the throughput of sending short messages per second on onesmser platform is 300. The whole transmission is not limited by the operator's gateway, but depends on the development ability of our own platform. Our technicians are in the process of further development and research, and will definitely not be able to reach this speed in the future.