In September last year, when Apple released the iPhone 7 and iPhone 7 Plus, it introduced two new color options, previously unseen on iPhones: Matte Black and Jet Black. From the beginning, Apple acknowledged that Jet Black iPhone 7 models were prone to developing "fine micro-abrasions" with time - this meant that users had (and still have) to take extra care of them. As it turns out, some Matte Black iPhone 7 units have a cosmetic issue, too, though this one hasn't been properly acknowledged by Apple. 

A growing number of Matte Black iPhone 7 owners are reporting via Apple's Support Communities that the paint on their devices has chipped or peeled off. In most cases, the problem affects small areas near the side buttons or the speaker grille. However, in one particular case, the paint has chipped off from the rear of the handset - as you can see in one of the images included below. These issues can show up both with, and without a protective case. 

The first peeled / chipped off paint problems have been reported in November, about 2 months after the iPhone 7 and iPhone 7 Plus hit the market. 

Apple's iPhone 7 warranty normally doesn't cover cosmetic damages, so users discovering paint-related issues will likely not receive replacement devices. 

Source: phonearena