Problem with CUSD AT command with HUAWEI Mobile Broadband E173

Hi

I want to get balance with AT+CUSD command (AT command) in my HUAWEI Mobile Broadband E173. But unfortunatly I don't get any respnose and I just get OK in response. My ussd code is *555*1*2# . Also I can use *141*1#

I have change AT+CSCS and also AT^USSDMODE but was not successful.

Can any one help me?

AT+CMGF=1

OK

AT^USSDMODE=1

OK

AT+CSCS?

+CSCS: "UCS2"

OK

AT+CUSD=1,"*555*1*2#",15

ERROR

AT+CUSD=1,"AA5AADA68AA96423",15

OK

AT+CSCS="GSM"

OK

AT+CUSD=1,"*555*1*2#",15

ERROR

AT+CUSD=1,"AA5AADA68AA96423",15

OK

AT+CSCS="IRA"

OK

AT+CUSD=1,"AA5AADA68AA96423",15

OK

AT+CUSD=1,"*555*1*2#",15

ERROR

It is same for UCS2 character set and also AT^USSDMODE=0.

Any idea?