They say its unlimited calling but its not you cannot make unlimited calls there is a limitation calling on daily basis.If you crossed those minutes then you cannot make out going calls. net will work as 2G speed. I think they are cheating customer keeping the lines like " Get Truly Unlimited Local, STD & Roaming calls within India with 1.5GB 4G/3G Data per day, 100 SMS per day for 28 days ".