Follow The Steps -:
1) Simply Install RemoDroid App [ Click Here To Install ]
2) Open it
3) The app is separated in two parts:
1. Pressing the "Stream" button allows screen sharing and remote control of the current device. Only that mode requires ROOT PERMISSIONS
2. Pressing the "Connect" button allows you to see the screen of a streaming device and as well remote control it. That mode does NOT require root permissions
(Choose stream)
4) Now Do The Same On Another Phone and choose connect
5) That's It You are done Now