My daughter's iphone 7 plus has the greyed out wifi problem. Which it seems to mean it is a defective wifi chip. This phone is a replacement she received last October for her for iPhone 7 plus which had another hardware problem. So less than a year later, Apple wants her to pay $300 to "fix" (which mean give a refurbished phone) a problem that seems to be VERY common. Sound like a design flaw..........