This is very useless application for 4g mobile becuase some time this app cant open and suddenly stop working .it is very laggy ang buggy .no proper any update from jio comunity.so many issues create from this app some time due to this app my mobile hang automatic and stoped working .some time jio sim and jio 4g voice is online but it can shows you offline and you cant conect to the network .i understand jio devloped this app in few times . I hope next update solves my problems.but I think it is very helpful for non -volte smartphones.