I am using the Ringke Fusion case. Dust particles and other bits of pocket lint do get underneath the back cover. I take it out of the cover once a day or so to give it a quick clean, haven't noticed any scratches yet. The phone came with a screen protector on the back, but the cover very soon started lifting that, so I peeled it off. This is a brilliant phone at a great price, but it would have been nice if the glass back had been optional. Even the Ringke Fusion clear back pretty much hides the back, so in retrospect a thinner opaque cover might have been a better choice.
I have ordered a full body invisibleshield type protection as I rather use phones as naked as possible.... I will report back when I receive it and the phone.
Thanks for letting me know about that case.

