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

[Tchip]

do you have set the SMS service number firstly? you can insert your SIM card to your mobile phone have a test, whether can send SMS and make voice call.

Thank you for your early response. I have set the message center number and inserted the sim card completely. But it can't actually send or receive messages. I add that I have used this sim well with modules 800C and 900A.

Code:

AT+CPIN?
+CPIN: READY
OK

AT+CSCA?
+CSCA: "+84900000023",145
OK

Code:

AT
OK

AT+CMGF=1
OK

AT+CMGS="0913856555"
>
HELLO!
+CMS ERROR: Network timeout