About Secondary camera
Secondary camera is the second camera in the front part of a mobile phone. So many 3G mobile phones do come with a secondary camera nowadays, as it serves the need of video conferencing and selfies.
The secondary camera on an advanced mobile phone is frequently known as the front facing or selfie camera.
The selfie camera is most normally used for talking self pictures for Social Media and video calling.
Moreover, the front looking cameras work related to supplemental technology to give face-detection for advanced phone security.