Today people are surprising with 
= let`s assume 20 cr customer ( out of 70 cr feature phone users) will buy this mobile 20cr X 1500 Deposit= 30000Cr. Now, every customer will pay 153 Rs/ Month means 20 cr X 153 Rs X 12 Month = 36720 Cr. ( 1 Year revenue= 30000 36720) = 66720 Cr)
Now, consider 10% additional customer
every year so at 3rd year customer base would be around 24.2 Cr. So revenue 24.2 Cr. X 153 X 12 = 44431 cr.
At 3rd Year 44431cr 30000= 74431 Cr In book ( here not considered cost)
Now, from collected 30000 Cr from Deposit he may earn 12% return through investment. So in 3 years earning is 10800 Cr.
44431cr by recharge 30000 by deposit 10800 by Interest= 85231 Cr Revenue
He will return 30000 Cr to his First year customer base means to 20 cr customer
85231 Cr - 30000 Cr return to Customer . Remaining 55231Cr ( Not considered 2nd year added customers` Deposit)
This 55231 Cr from only Features phone mobile
Now, after 3 years JIO subscribers 20 Crs ( today 12.5 Crs) means 20 cr X 303 Recharge X 12 Months= 72720 Crs
JIO feature Phone JIO Subscribers= 55231 Cr 72720 Cr. = 127951 Cr. Revenue in 2020.
It`s bigger than Any industry size