My experiences fro idea are here
1) Now idea implemented 4G data plans, but in our india there are still villages like Kannur , there even 3G is unavailable.
2) Data chatged are high.Also 3G data plans will not work due to bad network coverage.
3) Call charge reducing plans are n
ot reducing cost, it acts ad an extra charge
4) If you are lacking balance, then you cant even call to the customercare , becouse it is also needed money
5) Night offers are not good as airtel, night internet offers are too slow
