It is incredibly frustrating when your iPhone screen not responding to touch happens out of nowhere. Usually, this is caused by a minor software crash where the process responsible for touch input simply freezes. Before panicking about hardware, check the basics: is your screen clean? A tiny bit of moisture, oil, or even a cheap screen protector can interfere with the capacitive sensors. Try wiping the display with a microfiber cloth. If that doesn't work, a simple force restart—quickly pressing Volume Up, Volume Down, and holding the Power button—usually unfreezes the system and restores full touch functionality.