Ah, I love this kind of streetwise innovation: The missed call.
Very popular in India it seems. The idea is that if you are calling someone who is better off than you, you will phone them, and hang up, so your number is transferred and they can call you up.
The system is known in many countries, there’s even a Wikipedia entry detailing the name for the system in many languages and with some examples of common codes:
- In Bhutan, farmers know how much milk their customers want by the number of missed calls they get.
- In India, a missed call from a shop or business means "Your order is ready".