The reason to introduce such a feature is the low percentage of smartphone users in India. When compared to the US and other Europe countries, the adoption of smart phones is very less in India. A statistic of 10 percent of young people use smartphones here.
This feature makes life easier for the Facebook users, they can update the status by simply calling to a number, instead of subscribing GPRS plan and buying a smartphone.
To avail this feature, Aircel users can call 51555, enter their credentials and update their wall from there.