You choose prepaid or post paid it is essential that in your pocket there are enough money. Secondly mobile phone buying is not very hard task but hard task is to carry on it.
There are three type of mobile phone users in our country.
1)Rich persons
2)Middle class:-Mobile is needed just to communicate with house while they are away.
3)Students:-Abroad from home.
The rich persons uses cell phones for both incoming and outgoing calls.The never care whatever the bill is.
The middleclass users and the students care about the mobile phone bill, They always have to aware about the mobile bills.
So I think Prepaid is for the middle class and students(Incoming are now free on prepaid also), And Postpaid are for the rich persons.