Check with CC whether any Fair Usage policy is applicable.
Max download say 15 GB 25 GB etc for UNLIMITED plans.
http://www.tikona.in/city_plan.php?cityid=10&mid=13 ( MUMBAI)
calculations : ( approx ( *conditions apply )
1024 Kbps 128KB/sec 6MB/minute 360MB/hour 2 GB/perday approx 6 to 8 hours.
Max for month: 60 GB. approx
Whether when you ask for change in Tariff plan installation Charges also to be paid again ?
if you intend to use Laptops in wifi mode etc additional Rs 75 P.M will be charged.
( does not say for each extra laptop or for unlimited systems )
similar to DTH where you have to pay for additional TV in your house.