What is the service charge of "10 158 SMS listening" in Hainan?

Hainan "10 158 short message listening" service: there is no monthly function fee, which is only a point-to-point voice service for Unicom mobile phone users to send voice information at short message rate. The maximum time for each voice message is 30 seconds. 0.2 yuan is charged for sending voice short messages, and answering is free, free of long-distance charges and roaming charges; Send it to Hong Kong, Macao, Taiwan and the United States at an extra charge of 1 yuan, and other countries at an extra charge of 2 yuan.