Question “+CME ERROR: unknown network message” error while sending AT USSD command

Aug 7, 2019
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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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