The link you provided is from 2012. Much have changed since then. People don't use sms now. Plans and prices too have changed.
Anyhow, taking your own link as example. Let me tell you one fact. Indians are smarter than US. Indians are much more price and value councious and they know that they are not computers who would talk for 800 minutes per month. In reality the usage changes for majority of customers every month. In USA majority users are postpaid which they take as a contract with a mobile. They definately pay more monthly.
Secondly, due to the varying nature of usage. The monthly fixed rental would definately make it costly vis-a-vis prepaid.
Thirdly, I don't agree that even with high usage prepaid is costly. It's your myth. The previous example shows it very well. In which the user got 30p/min on postpaid while with a small top up you can make 1p/sec to 30p/min/two minutes.
And lastly, the benefits or talktime that you get for fixed rental per month gets lapsed every month if you don't use them. Which is not the case with prepaid. We get unlimited validity on our talktime balance. It never gets lapsed. This single point alone saves you a lot of extra money depending on your usage.
not really
you cant say one is better than the other or that contract system is expensive or something
depends on usage
some of us have higher usage
also recharging is a pain if you keep travelling etc
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also Docomo may be cheap but its connectivity scores a zero in Maharashtra and Karnataka
you cannot generalise and say anything is better in telecom, there are just too many factors