This sim is free for 4g internet, voice calling, phone sms, and video calling also roaming is also free but till 31st december 2016. After 31st it will be chargeable as per its charges. The good things is that the internet is good it work perfectly the network dont goes. Now on other hand its calling is not good if the call is connected then its good but many a time it says while connecting that ’customer is busy’ and also jio calling require VOLTE setting which every phone doesnot have. So for calling you must download the 4gvoicecall thats available on the playstore the app drains battery like hell. Over all the sim is good if it works properly only the reason the sim lacks is the calling facilities we knoe that team jio will find some solutions for that. My oppinion is tho buy this sim becose its free of cost and you can enjoy 3 months of free internet and calling.