I am using Idea Sim card and its services for almost a year now.
The best thing is that, they provide good service in our region but as we move out of the city the network fails and not even a single tower notification can be seen on the mobile screen. The the worst thing about the idea Services is the high cost of the recharges, vouchers, terrif cards and top up cards. As there are other network operators used by my husband and children and they are better than this network operator.
I would not like to recommend to use Idea as it is expensive, poor network coverage and most important not economical.