OK, I took a l look at mine with a flashlight, and in the brightest light that I have inn my house, I still do not see any dust, I'm nor sure how you could have got dust into your phones, have any of you like tried to blow off your phones with a can of that dust off stuff? Maybe it got in through the back of the phone? Anyway if it is dust, it had to have got there somehow, and if it did get in then there is a way to get it out. I'm gonna look at this more closely in the day light, to see what is in mine if any, then I will report back to you all on my findings... I'm sure we all can find an answer to this problem.