The KOALA stays clear of the cameras on most iPhone and Android smartphones. If there is minor camera interference, the harness can usually be adjusted to resolve the problem.
A couple of notable exceptions are:
iPhone 11 Pro - The KOALA does securely fit around the iPhone 11 Pro, but one of the straps covers the edge of the wide angle camera lens. This is less of an issue on the iPhone Pro Max due to the larger form factor. Depending on which lens you primarily, use this may not be a concern for you. Some users have opted to slip one corner of the harness off when taking photos to eliminate the interference.
Samsung S10 - The KOALA is not ideally suited to phones with a horizontal band of rear-facing cameras, such as the Galaxy S10 or the Note 9. That said, adjusting the straps around the lenses or slipping off one corner of the harness while taking photos can solve this issue.