Well, I was looking for some implementation for Locality-Sensitive Hashing, then I landed on metaoptimize.com from Stackoverflow, thereby clicking on 'Hottest' gave me this first link, and I know that HN people love this sort of stuff, in fact while submitting this link I had this intuition that it has already been submitted earlier.
As far as the title is concerned it is intact from the source, but if you consider this template : Free textbooks on [choose subject] , then the only thing which matters and can attract people is 'subject'.
I disagree with the author, I don't talk about those miser souls who think they can save enough money by these miss calls, but if you are specially talking about that miserable 'poor', the post is targeted for, understand now that a proper call is more appropriate than making just a miss call.
If some of you are aware of mixed culture of urban and rural india in towns and small cities, then it's a norm for a taxi/auto [cab] drivers to make calls for their customers (I am not talking about professional cab companies, who provide cellphones to their drivers).
Vegetable salespersons, electricians, plumbers .. there is a long list of these, it was an era when they were used to miss calls, but they will rather make a call today.
However my take on this post is based on what I am observing in my surroundings, may be statistics say something else.
The other reason of making a proper call can go like this : some telephone companies in India sell their sim 'free' and you get starting free talk time of 30/50/100 INR, these sim are sold in wholesale(obviously targeted for conversions ), if not free then they are there for nominal charges. Barrier to entry for making a call is very less, it is used for free talk time,internet(with indian speed) then some trash the sim, some of them don't mind making a local call on tariff like 1 paisa per second . [ 1 Rupees = 100 Paisa ]
The circulation of current generation after two or three years, who is more into facebook right now, will come to know it is sucking them, there is nothing which adds something into them apart from being cluttered forcefully in so called 'social' stuffs.