How to send SMS on Unicom mobile phone to open the call reminder?

1, "Call Assistant" service is a missed call reminder service independently developed by China Unicom. After the user opens the "Call Assistant" service, the system will record the missed call information caused by the user's power-off or inconvenient answering, and notify the user in the form of SMS after the power-on (the access number will display the calling number from March 20, 2009). 2.2/3G users can send a short message from 580 1 to1001,and the order will take effect immediately. 4G users don't support SMS for the time being, so we suggest calling 100 10 for manual customer service. 3. Remarks: It is suggested that users outside Zhejiang Province contact customer service at the place of origin for consultation. Thank you.