Thd default 'BSNL 3G Data Card' application that gets installed by the data card has 2 USSD commands hardcoded - 1. Check Balance and Validity that sends a command *123#2. Check Data Usage Balance that sends a command *112#This data balance command *112# does not work for all circles - for example, within the Chennai circle, you need to send *124*1# to find the data balance. But the software does not allow edit of the commands that will be sent.USSD Commands are stored in the file 'USSD_Config.ini' in the application installation home directory (C:\Program Files\BSNL 3G Data Card). Edit this file to add/modify the USSD commands that you want listed. For Chennai TD, this could look like -[UI_USSD_SECTION_USER]UI_USSD_USER_ITEM_COUNT=2NAME_1=Check Balance and ValidityCOMMAND_1=*123#INFO_1=NAME_2=Check Data Usage BalanceCOMMAND_2=*124*1#INFO_2=Regards,PRajan.