I took some pictures on a dusty TV bench before I moved it to a cleaner surface with better light. Didn't have time to give the case another clean.
K
However the hard plastic shell pushes the inner silicon layer very tight along the left and right edges and I don't think much dust will get through there. The hard shell doesn't cover the top and bottom edges though and here the case is just like any soft silicone case, this is where the dust will get in. When you hold the phone, even in landscape, you don't notice/feel the top and bottom edges are softer or lose.
I've used the phone for less than 20 mins with the case on and so far I like it, will need to use it for a few days though.
I need something tough because when at
home my 1 yr old wants it all the time to watch cbeebies (iplayer app) when he can't get on the ipad or TV.