To engage data revolution, I suggested some steps can be taken by mobile operators. Two of them, first to offer double data on night usage and second to offer data topup without any validity has been by Airtel.
Now Airtel's data topups, which are promoted as no validity data packs, are trashed down by many as they offer very low amount of data.
However I believe Airtel may get some active data users on its network. Take this example, you have WiFi at home and office and so you need cellular data connectivity only when you are travelling from home to office and vice versa.
Airtel plans to fill this gap as during the travel you can opt this packs for low volume data session with mail & messaging.
We can hope others would come with such plans with more data.