Hi @varun.sahni,
You could check the phone number if it is written to SIM by command
AT+CNUM
Please note that, this command does not have the question mark at the end.
Could you please try to send the following commands and share with me their responses? According to the responses, we will have more information about the issue you faced
ATI3
ATI9
AT+CCID or AT+ICCID
AT+CREG?
AT+CEREG?
AT+COPS?
AT+CMGF=1
AT+CSCA?
AT+CMGS=“< number>”
In case the destination is also a HL7688 module. To see the SMS appear, please make sure you have enabled the SMS notification
Thanks,