When I try to open my settings app my phone goes black
what do I do if every time I go to click on a app my phone screen goes black?
iPhone 7, iOS 11.2.6, None
You may need to seek help from an Apple store genius or authorized service to access the device.
• Genius Bar Reservation and Apple Support Options - Apple
The first-linked article below has suggestions on what to try if your iPhone has black screen, & etc.
• If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support
• Restart your iPhone, iPad, or iPod touch - Apple Support