Forum discussion tagged with ussd.
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    Question “+CME ERROR: unknown network message” error while sending AT USSD command

    I am trying to execute USSD codes through my GSM modem. When i try USSD command which gives me some options, it is executed but i can't get any operation done from the options. AT+CMGF=1 OK AT+CSCS="GSM" OK AT+CUSD=1,"*101#",15 (To check balance) OK +CME ERROR: 264 AT+CUSD=1,"*17108#",15 (To get...