FPV RC Rover Using Smartphones

I initially built a servo driven RC rover for my son to play with and because i found it to be something i have to try for myself. Who would guess the rover just been driven by two normal 9g servos. Thanks to rctestflight.
I just take it a little bit further by testing it for a ground FPV platform. Inspired by a friend who uses two smartphones as an FPV gear for his quadcopter, i dig out my old Galaxy Ace.