Why nobody uses voicemail in India

Here's an excerpt of Rashmi Sinha's post on voicemail and missed calls in India. It's interesting to note how the mobile phone is used across the globe -- something that we often take for granted:

Sitting at the Uzanto Delhi offices, I would often hear a ring or two on someone's phone, they would look at the phone and then continue what they were doing. Its a system that works quite well. In fact, its brilliant: communication without explicit communication. What the missed call means seems to depend on who it is from, time of day, and number of rings. I wonder if cell phone providers can build some type of an offering that facilitates this?

We are indeed living in an advanced society!