I tried to achieve a similar goal:
The cleanest solution would be if syncthing allowed sharing multiple instances of the same source folder, but with different ignore patterns, which, to the best of my knowledge, is still not possible as of today.
If that was possible, you could create 3 folder shares for your same ‘photos’ folder:
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Syncthing Folder 1: (photos) - exclude iPhone & Android subfolders
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Syncthing Folder 2: (photos) - only include Android subfolder
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Syncthing Folder 3: (photos) - only include iPhone subfolder
This would give the flexibility to configure the shares any way you could think of.
I continue to hope that this will one day be possible in syncthing 