AT command sent SMS received as Flash SMS (Class 0 SMS)

tux_tina

I used this link to send SMS with AT command in WPF. But when I send SMS with CMGS command, the receiver get the SMS as Flash SMS not usual SMS. My code is as below: //Check if modem allows you to send and receive SMS messages using AT commands, without the need to decode the binairy PDU field of the SMS first rval = sp.SendCommand("AT+CMGF=1"); //set Text mode parameters rval = sp.SendCommand("AT+CSMP=17,167,0,16"); string phonenumber =...

Originally asked by Sarah on Stack Exchange (stackoverflow) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

The fourth parameter in AT+CSMP sets the coding scheme, i don't remember in which document i've found the coding of this byte but bit 7 sets whether the message should be discarded after showing it class 0 or stored You should set this bit to 1 to make it storable, so changing rval = sp.SendCommand("AT+CSMP=17,167,0,16"); to rval = sp.SendCommand("AT+CSMP=17,167,0,144"); should do the work

Full answer by colmo: https://stackoverflow.stackexchange.com/a/53391592 (CC BY-SA 4.0).

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