I am using vodafone for last 10-12 months and in that period of time I never got any issue regarding its network, call quality, net speed for 3g obviously I am.not challenging airtel 4g girl but I am happy with its speed.
Call rates are also very normal and as I am using corporate plans I can definately tell you that in corporate plans as well vodafone provides priceplan and call rates cheapr than any other company out there whch provides such good quality of network