Thumbs up A Well Formed Better App To Know Balance in Prepaid Phone in India

I had never seen A real developed app to get balance in my prepaid cell phone without any problem.
But I have come across

This is really nice one and working perfectly.
I would like to suggest my Indian Indian friends to use this nice app without any hesitation.
Please provide some suggestions on this app if feel good.

Sometimes for my BSNL network I am not getting the proper response. It is the problem of network only.