The jio sim or the operator is amazing not only because of the preview offer they have given but also because they have kept their promise .3 months of unlimited internet, calls and messages that too 4g is like a dream.Though initially there were some network problems now its fine.the only thing which was a restriction was you need to have a lyf mobile i.e. you spend money to buy mobile and get unlimited internet for free.But this existed only for few days.There are many videos in YouTube regarding the use of jio sim in any android mobile.So reliance jio is a very good boon to us which gives a good speed and is totally reliable