My old webcam is blurry. A friend told me that most phone have better quality camera than entry level webcam nowadays.
For the people that want to try, the DroidCam OBS Camera app (Android or IOS) allows us to use our phone’s camera in OBS on the PC.
OBS saved the recorded file on my PC and it worked pretty well. 
I’ve also heard about people using OBS for the open mic, so I guess that it could work for open mic too.