Hello guys.i wanna write a comment on jiofi4.if u have not a 4G handset then u have not to be worried about because jiofi4 will recover all ur hopes.its signal so strength and powerful.it is the latest technology of jiofi.u can also call from it using a single apps and if u keep on for continuously 1 day it will not down easily because battery wake up is really good .u can enjoy it.i m using it from 1 month it really impressed and make me happy whenever I use it.it really a good product.