Jio calling is not supported in iphone 5s which is a bad news for all iphone 5s users as only the option provided is of DATA and not Of VOICE so u can only use DATA support from JIO in iphone 5s which has become a drawback for the iphone 5s buyers now a days .! So if you want to enjy the jio free data opertunity and u are looking for buying an iphone 5s I recommend to think twice before you buy.! than you