In this video, I have explained a step by step method of scanning 3D objects using the photo mode of Polycam app using iPhone 12 Pro phone.
You can try the app yourself here https://apps.apple.com/us/app/polycam-lidar-3d-scanner/id1532482376
Here is the content of this video:
00:40 Photo mode scan
03:40 Cropping scan
04:16 Object masking mode
07:07 3D Printing scanned file
10:38 Modifying scanned file