Read SMS message from SIM7600G-H

Hello Everyone:

I am using SIM7600G-H Arduino Shield with Arduino Mega. I have no problem sending out the SMS messages. But I could not receive any incoming SMS messages.

When I tried to use the AT command "AT+CPMS" to set the preferred message storage, this is what I got.

AT+CPMS=?
+CPMS: ("ME","MT","SM","SR"),("ME","MT","SM"),("ME","SM")

OK
AT+CPMS?
+CPMS: "SM",0,0,"SM",0,0,"SM",0,0

OK
 

It looks like the SIM memory storage is not available.

Also, what setting should I use for the "AT+CNMI" command if I want the incoming SMS message sent straight to the Arduino Mega serial port?

Thank you for your helps.