Module sim7670C cannot send messages, cannot call, nor receive messages or calls! Ple

[Tchip]

Hi everybody! I'm new to the 7670C sim module and currently I still don't know how to configure it to receive, send messages and calls.
I sent AT commands to it and it responded OK. But when I send messages and calls, it cannot make or receive calls and messages. Look forward to the help. Thank you so much!