The phone has the same specifications to the HDC Galaxy S4 Legend, the only difference is that Legend has 2 sensors whereas Spark has only one (it cant understand if the air motion is coming from left or right) also Legend has OGS, whereas Spark dosent.
First of all there is no any ROM available for this device so we will have to improve the device ourselves ...
Lets start with S-View Cover
S-View Cover (How to get S-View working on your device like Original S4)
1)Download and install S-view Hatroid from Playstore ...
2)Go to settings and set the options
3)Press start service
4)Oulaaa now you get s-view with clock and call answer like Original s4 using the proximity sensor
5)Hide s-view icon from the UI app pages