IDEA mobile operator is now so old but their is no such improvement that you can satisfied with it.
NETWORK is bad in many areas and no network coverage in many areas. so in town areas it ok with 2g network but when you go in some village type area you cant relay on idea because there is posiblity of no network coverage.
3G services is very rear in case of idea you can not find good 3g services any where also 3g data cost is very high as compared to others.
Only good thing about idea is that it has low call rate idea to idea.