Can anyone tell me about calling plans from USA to India?

India Calling Cards
Shawn T. Vedic Astrology Student asked:

I have a friend in India, and I am wanting to know general information about calling plans. I have a cell phell phone, and she has a cell phone, and I am concerned about cell phone charges on top of the calling card charges. Anyone have friends in the USA or India, and know about how much it costs to talk back and forth? Thanks in advance :)