Q: iPhone SE dust particles under rear camera lens

You would need to take it to an Apple store, to get it cleaned from there or replaced. Do not try to clean it yourself.

I Have this problem too but i did not make any contact with apple.

I have the exact same problem. I have had my iPhone SE replaced already for a screen issue and this current one has had its screen replaced for pixelation. Both iPhones have at least one particle of dust in the lens. Luckily my current one does not have it right over the center so I have not noticed any problems taking pictures so I will probably leave it alone.