My first Lumia 920 accumulated more and more dust in the front camera, and after about 30 days, the front proximity sensor stopped working. This meant that the screen always turned black as soon as I would make a phone call preventing me from using the other phone features or even hanging up! Swapped it out for another 920 as was my only option, and guess what, after 5 days there is already dust accumulating in the front camera housing, AGAIN... The worst part, I'm past my 14 days to swap it for a different phone, and ATT is giving me **** just trying to get another replacement... TERRIBLE! Plus the WP8 ecosystem sucks, but I knew that going into this.