Dialing the same person's mobile phone number and electric signal always prompts: the subscriber you dialed is busy, please redial later. But she got the text message because

Telecom directory assistance has this function. After self-setting, you can intercept incoming calls, enter the setting management interface, and click' System Settings' to enter' Harassment Interception Settings'. You can choose blocking rules (smart blocking, blocking only blacklists, blocking strangers, blocking everyone except whitelist, blocking all). Ring back tone for call interception: including (busy tone, power off, power off, and blank tone). Web page link