How to cancel the letter of Sichuan Unicom by texting?

1, 2G and 3G users, edit the short message "pbyw" (that is, the pinyin initials of "blocked business") and send it to 100 10. 2. For 4G users, China Unicom's SMS blocking (recovery) is temporarily not supported. You can contact local customer service for help. 3. If only one company's joint communication service is cancelled, send 0000 to the number that sent the message, such as QQVIP service, and send 0000 to 1066 1700 to cancel.