BSNL offers me a pack which I consider cheaper than other networks and also with wide signal coverage. BSNL gets me signal even in remote areas. Im currently using a plan available for AP circle called Nestham Offering cheap call at 15p/min to one of the 5 registered mobile numbers ( being BSNL, or 35p/min for other net) . Call quality is excellent. However where they lack behind is better customer service as the employees at the service centre are lazy and unfriendly most of the times. Coming to data, they offer the cheapest 3G rates in the state at decent speeds and coverage. However, they are yet to enter the 4G LTE stage which other networks are offering. I also get 60 SMS a month free with my pack which is an icing on the cake.
whats more is that this pack costs just 29 for 6 months which can be extended by recharges of 200 or more.
Im using it as my primary SIM and consider it the backbone of telecom industry.