Another concern is the data amount. Circle wise they offer different data packs. Mumbai has 3G data packs to 21GB whereas in Chandigarh circle Failtel offers a mere 2.5GB data pack at max and then 4G plans start, max to 10GB. Beyond data pack usage crippling to 128kbps is brutal.
In comparison , mtnl offers 3G 100 GB - 2 month validity plan, I think 2500 Rs. ; In the same amount, failtel offers 21GB. The only plus point of failtel is good network in comparision to mtnl