Are 3G data tariffs cheapest in India?

So two telecom giants in India have further reduced tariffs for 3G data. Reliance now offers 1 GB of data for Rs. 125 (~$2), 2 GB for Rs. 250 (~$4) and 4 GB for Rs. 500 (~$8). Airtel, the biggest operator in India has followed suit and priced the new data slabs similarly. This move, I suppose, is to counter possibly ridiculously low 4G tariffs which will be introduced by Jio in the coming months after its launch.

How much do you guys pay for 3G/4G data plans in other countries?