The price of mobile data seems to have a huge impact on the valuation of the service provider
America: 1GB Data = ₹450 India: 1GB Data = ₹14
Xfinity is the biggest internet provider in USA.
Jio is the biggest internet provider in India.
Xfinity Valuation: $151.10 billion Jio Valuation: US$1.9 billion
Jio Total Subscribers: 424.52M Xfinity Total Subscribers: 30M
What's up with such a massive difference in valuation

Considering the purchasing power difference in the country. It's no surprise, having 10x the userbase does not mean much when you're earning only 3% as much per user
The difference in valuation is basically because the Ambani's work very differently from an average American company.
The Indian businessman makes the most of every paisa, without diluting too much equity and making sure to gain the trust of as many customers.