There are no unlimited 4G plans in India.
The pricing varies from:
USD 4 for 1GB
To
USD 45 for 20GB
Keep in mind that the purchasing power in India is much much less than USA.
Most people don't spend more than USD 5-10 per month on their total mobile Bill, all inclusive.
And those who form the cream rarely spend over USD 15-50 per month all inclusive. Often including International Calls and National Roaming.
In fact you can get a plan with:
Unlimited Local, National, Roaming Calls
Unlimited SMS
Unlimited Incoming/Outgoing (International Calls charged extra)
Free Music
Free Movies
7GB 4G data
All for just about USD 30 per month.
But when you convert this Acc to PPP it is about USD 120-150 per month in US terms.