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I send USSD command with AT. Sometimes I receive the response CUSD=4 sometimes it works for the same input. The error always appends at the beginning of a new USSD session (#xxx#).

Do you know what exactly means this response? The description of the error is operation not supported. Is-this message due to the modem or to the network? How can I avoid it?

Julio
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1 Answers1

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Such message mean you(or soft) issues AT+CUSD command

Any response except 0,1 are errors.

Exact error have follow message. Try enable debug to see full message.

Code 4 can mean different things depend of modem used, for more info you need check AT commands for modem you have.

arheops
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