Check the credit card SIM

For sending SMS, I use kannel, which installs as a daemon taking control of
GSM modem huawei e220. SIM card installed in the modem is a prepaid card.
in this case I want to add code to monitor the credit card. and issue a
warning if it falls too low.
type sends commands to the modem using the AT command CUSD. Are tested
immediately with minicom:

AT + CUSD = 1 * 222 #, 15
OK
normally after this OK I have a message like this
+ CUSD: 2, "Current Credit: 00.00 DA", 15

but I will have no result
I do not know what the problem is and if there Is there a solution

thank you for answer
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