I just used this phone from 1 january 2017. I just realize that is fast charging system with vivo charger. But very fast discharging of battery.soo cheap battery. Discharge very fast.! After few days when upgrade is available for this.for HD calling in jio. Customer care are takes a lot of time to upgrade this. . I waits near about 3 hour only in upgrade. Customer service is also so bad.when I enterd other sim then its take a lot of time to search networks. OnlY one thig which I like that is earphone. Listening music in this device is so much fun. But satisfieng result did’nt given.