The touch-screen display on an iPhone is the heart and soul of the smartphone's performance because it provides access to everything. However, when this 3.5-inch diagonal widescreen touch screen isn't performing well, Apple recommends performing a series of strategic repair steps to improve the screen's sensitivity or get it working period.
When the touch screen on an iPhone suddenly loses sensitivity, you have to press it a little or a lot harder than usual just to get one of applications to launch. In addition, portions of the screen may or may not respond depending on the extent of the problem. In the worst-case scenario, the screen will stop working completely. In such a state, no matter how firmly you press it, it simply won't respond to touch.
Causes of screen problems on an iPhone may vary with different users; however, dropping the iPhone or accidentally immersing it in liquid are two issues that can interfere with the device's hardware and iOS and cause screen problems. Sensitivity problems may also occur if the display is dirty. Although protective films such as screen protectors can keep the display free of dirt and fingerprints, some of them can prevent the touch screen from working properly. Many of these accessories are made by third-party companies, so Apple doesn't guarantee these items will work properly.
If the iPhone's screen is dirty, cleaning it with a soft, slightly damp, lint-free cloth can improve the touch screen's sensitivity. In addition, if the touch screen stopped working after you installed a screen protector, removing it will improve the device's performance. According to Apple, touching the screen with wet hands will cause problems, so drying your hands before using the iPhone is ideal. If the problem persists, pressing and holding the "Sleep/Wake" button, dragging the red slider, and then pressing the "Sleep/Wake" button again will restart the iPhone and can solve a temporary iOS problem. If the phone didn't restart, pressing and holding the "Sleep/Wake" and "Home" buttons together for at least 10 seconds until the Apple logo appears will reset the device.
If these troubleshooting steps don't work, restoring your iPhone with iTunes is necessary before contacting Apple support. Restoring your iPhone erases saved content, so creating a backup copy from the device's "Summary" in iTunes will come in handy if you want to later restore the content to the phone. In addition, upgrading to the latest version of iTunes before performing the restore process will decrease the chances of iPhone-to-computer connection problems. Proceed to restore your iPhone from the device's "Summary" tab in iTunes when these previous steps are in order. If the problem persists, contact Apple support (apple.com/support). If you live close to an Apple retail store, scheduling an appointment with Genius Bar, the store's technical service department, is ideal because the device's hardware is probably faulty.