"Indian cell phone subscribers, of which there are 900 million accounts, have a monthly average revenue per user of $3, which is rock bottom low for even a developing market."

In India, the “missed call” as a means of communication and interaction has developed into a cultural and business norm.

Also:

Missed calls are being incorporated into mobile apps and services as a standard type of messaging like a text or an answered call itself. For example, an Indian cloud telephony service provider startup called KooKoo has been working with a Bangalore-based company to create an information market based around missed calls. If you want to know the latest weather, the latest Groupon-style deal, or the real-time bus schedule, you can send a missed call to the designated number and get an automated or manual voice call back with the answers you need.

(Via GigaOm)

(Source: dbreunig)