FAQ - Frequently Asked Questions

Check that the SMS mode, text mode is activated: AT+CMGF? Must return :1
Check the presence of the Center Address N° of your operator (AT+CSCA?)
Check the command AT+CSMP? => Response +CSMP: x,y,0,0
Check with your operator if the subscription includes the transmission of SMS

To receive an acknowledgement of a SMS sent, send the following commands:
AT+CSMP=49,167 (command not saved)
AT+CNMI=1,1,0,1,0