Faster access is sold by gigabytes, which gets reset every 24h (You can still continue browsing after hitting the quota with lower speed). Meanwhile in the US, it's the same but your quota gets reset every billing period. Not sure which is the better model, but it's practically the same

I payed 140 Rupees per month for 10GB per day in January (Vodafone). Special deal on the poush mela. We tried, yes it is throttled after 10GB to a slower speed but continues to work. Who needs 10GB per Day anyways? I had to read and re-read the contract, i was first assuming it's per month but no, daily reset. And it works in all indian states. Tell me where on this planet there is cheaper data?

Have you tried to buy mobile data in the US recently? Nothing is unlimited. And if they say it is unlimited, you will get severely speed capped (128 kbps or even less) after X gigabytes.