How to know my mobile balance

Network Provider	Dial Code
Idea	*130#
Vodafone	*123*1# or 1231 for IVR facility
Airtel	*123# or 123 for IVR facility
Aircel	*125# or 123 for IVR facility
Reliance	*367#
Videocon	*123*1# or 1231 for IVR facility
Virgin	225 for IVR facility
Tata Docomo	12527 or 12525