Hey guys, Recently, I noticed a noise inside of my phone. I've never dropped the thing or anything, and it may have been there for a while, but I just noticed it. Anyways, when I shake my phone, a distinct shaking sound can be heard. I thought it might be sand or something, but it's more then that. It sounds like little bits inside are shaking around, and it sounds like they're of various sizes and maybe materials. The sound can be distinctly heard from a few feet away. Should I be worried about this? Will Apple replace it? I'm still within my warranty.