On my god is not a widespread !! Here in Brazil all the iPhones mateblack with this problem mine too I'm so sad I buyed it just 3 weeks ago and is the same same similar issue !! Identic showed hereAnodized material doesn't rub off easily unless it's being rubbed off with something stronger such as grit. Pockets are known to have grit in them for some reason.
Ideally, you'll want to seek the opinions of owners who don't use a case with theirs and ask to see their phone backs. Provided I'm correct in my assessment, there shouldn't be any textural changes to the phone's back where skin meets metal.
[doublepost=1485992888][/doublepost]
And your problem ? Was it solved?So I went to Verizon today and they confirmed that the finish was starting to wear and acknowledge the speckles across my phone. He suggested that I contact Apple Customer service though because they would just send me a refurbished iPhone. So I called Apple back and long story short I sent it to UPS and within an hour I got my case number with them identifying the problem as
"Problem Description: Physical Damage - Enclosure - discoloration" The rep. said that he hasn't heard of people having this problem and that I was the first to report this to him. I'll inform you guys if they send me a new iPhone or not.