I've been running in to problems with my phone that I see as poor build quality.
First up is the speakers are blown. Apparently the same speakers for music and the earpiece are the same because it's now pretty useless for calls with me always saying "what" when it crackles.
This happened on a Sunday night after the closest T-Mobile store closed, and pre-update that limited volume. Later that night my phone fell out of my pocket when getting out of my car (a Miata... Short drop) and the screen has a tiny crack that I don't see as needing replaced, but ruins my warranty replacement idea.
Now my phone won't charge because the port is loose.