“+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 a data pack)

    OK

    CUSD: 1,"1.Datapacks .Voicepacks .SMS Packs .Billing info ote: Back:* Top:#",15

    AT+CUSD=1,"1"

    OK

    +CME ERROR: 264


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