I use idea network Sim since 8 years and it has been always in good network. Some of the pros are:
It has great network except on the roaming on some places in the states like Bihar, Jharkhand, etc.
The recharges are very compatible and full talktime on recharges like Rs40.
Offer netpacks having too much validity with lots of data that is good for using whatsapp and facebook. The internet speeds is good in 2G, 3G but nood applied for 4G.
It gives emergency loans for calling as well as data for Rs8.
The night netpacks are cheap and very good speed as compared to other network providers at Rs 7 for 400MB data.
Some of the cons are: