I also use the idea sim I only use the Vodafone and the idea
I use idea because it’s low call rate without any charge one day a customer care call me and offer me to subscribe 40 paisa per minute local / std cal for 3 month without any charge I allow him to activate this service on my number and also give thanks for this information by the operator service.
The network quality is as equal to vodafone operator but if you use 3g in idea operator speed is not good as compared to the Vodafone
I belong from the Uttar Pradesh so I think it is the network problem of service provider. So I would recommend idea for caling