LENOVO Z2 PLUS VOLTE ISSUE with jio
I got the solution  , 

In some regions and cities Reliance puts limits on the speed so if it doesn't work for you that means in your area Jio speed is limited by Reliance itself does not matter what you do so keep that in mind. So folks here is the settings. Go to Settings -> Cellular Networks -> Advanced Options -> Access Points Names -> Internet In APN you have to change the following, rest all remains the same:- 1) APN Protocol: ipv4/v6 2) APN Roaming: ipv4/v6 3) Bearer: LTE Save, restart and enjoy..