We have created an app to 3D scan people with just a smartphone. Here is the link: https://apps.apple.com/us/app/in3d-io/id1467153183 . So far it only works on iPhones X and later but we will support more in the future.
We would love to hear your feedback if you think it's useful, what to improve, etc.!
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https://sketchfab.com/3d-models/kolya-adb1feac7a694de39000017bc8a0a67a
The most challenging part is the head and we plan to improve its quality significantly in the next months.