I am from Uttarakhand(Haldwani) In Uttarakhand specially hilly areas, probably more than average mobile network is not up to mark but the most worst network I used in my area is Aircel. I used Aircel approx 4 to 5 months but finally because of poor network I swap it from Aircel to Idea.
Aircel Data network is better than its voice network. If you want to use it for only internet purpose you can go for it but its voice network is very worst. It is my request to Aircel, please do something for it and do some workout on poor network.