A "cellphone camera" refers to the camera that is built into a mobile phone. It allows you to take pictures or record videos using your phone. Full definition
I arrived just as the artist asked all audience members with cellphone cameras to step in front of his camera to have their picture taken — so I did. (burnaway.org)
They're also developing a version that attaches to cellphone cameras as a quick and portable diagnostic test. (sciencemag.org)
It's also simple and fast, two things many cellphone cameras are not. (theverge.com)