Can't use sendUSSDSynchronous about gprs_sim900 HOT 4 CLOSED

@peterloveland94 Hi, can you try to manually issue AT command to check if you can use USSD service? Upload example SIM900_Serial_Debug, open serial monitor issue below commands. It's sure that what I got is not expected to you.

AT+CUSD=1,"*100#"

OK

+CUSD: 2

AT+CUSD=1,"*111*2#"

OK

+CUSD: 2

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Thanks for the speedy response!

I can confirm that all of these commands work as intended and are issuing the correct responses, including the response from the network (the balance remaining on my SIM).

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Please show me the response of balance, I was confused that no balance responsed to me. Thank you.

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#define ballance "*120#"
char result[10];
char response[200]; //beware your memory
String ballance_string;

void setup() {
gprs.sendUSSDSynchronous(ballance,result,response);

ballance_string = String(response); //convert array to string
Serial.println(ballance_string);

}

This worked for me. Hope it helps someone else finding this.

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