I am using iphone 5s. and in this phone calling is create by jio 4g application, this application is worst. its take time lots of time to online and if I am not online on this application calls and massages are not coming on my iphone.some time I receive the call on this application then its going to hang. this application have sound problem also. internet us also going slow in the reliance jio. reliance jio provide best internet in statring dats but now its worst. 1gb data is finished very fast in the jio. I am facing many time this problem. my internet fast net finished very soon. only one or two network points are coming in my home. jio 4g provide service on reasonable prices and customer services also good. but network problem and calling problem is main problems of this network operator.