IPhone turning black screen

[2015Girl]

why is my moms iPhone turning a black screen? She tried everything. It’s 3 yrs old.

 

[djon41]

There's very little information here to make any solid suggestion, but I'm guessing it's due to the December 2nd notifications bug. Update iOS to 11.2 to fix it.

 

[44267547]

why is my moms iPhone turning a black screen? She tried everything. It’s 3 yrs old.

Not enough information. Such as Which model iPhone? Which version of iOS? Can the iPhone be powered off? Have you tried a hard reset aside from "Everything?" What was she doing prior before the black screen?