Excuse me, how does Samsung's 9388 set up a call rejection and automatically reply to SMS?

According to your description, this model supports the functions of rejecting calls and replying to text messages. You can try to have the option of "refuse to answer the phone and send a message" at the bottom of the screen when the phone calls. You can click and drag to the mobile phone screen, choose to refuse to receive SMS, and follow the prompts to refuse to receive calls and reply to SMS. Add the content of rejection message: standby-mobile phone-menu key-call setting-set rejection message (maximum 6).

Welcome to Samsung digital service platform: /c/samsung.