If you want to setup your smartphone as camera, then please follow the given steps.
1) Install the iHartCam Security Camera app in both phones.
2) Sign in on both devices with the same account and pair up with ease.
3) Set one phone as the Monitor and one as the Camera, and enjoy simple security.
4) When you select "Monitor" option, it will take you to the list of the Camera associated with logged in account. The icon near to burger menu in top-right corner will help you to switch between Camera and Monitor.