How to Calibrate an iPhone Screen

You can't calibrate the sensitivity of the iPhone touch screen but you can calibrate the motion sensors and the screen brightness.

Calibrating the Motion Sensors

Your iPhone's motion sensors can be affected by close proximity to a magnet or by environmental factors. When this happens, the iPhone notifies you to use the iPhone's Compass app to recalibrate all the motion sensors, including the gyro, magnetometer and accelerometer.

Step

Tap the Compass app on the iPhone screen.

Open the Compass app to calibrate the iPhone motion sensors.
credit: Image courtesy of Apple
Magnetic interference affects the motion sensor accuracy, making occasional recalibration necessary.
credit: Image courtesy of Apple

Step

Follow the on-screen prompt to tilt the iPhone screen and roll the red ball around the circle.

The digital compass resembles a magnetic-needle compass.
credit: Image courtesy of Apple

Step

Continue to tilt the iPhone until a compass appears on the screen. When it does, the motion sensors are calibrated.

Adjusting the Brightness

Adjust the brightness of your iPhone's display in the Setting app.

Step

Tap the Settings icon on the iPhone.

The Settings app contains the display brightness controls..
credit: Image courtesy of Apple
Adjust the screen lighting in the Display & Brightness section.
credit: Image courtesy of Apple

Step

Tap Display & Brightness.

As you move the slider, the screen lighting adjusts in real time.
credit: Image courtesy of Apple

Step

Move the slider at the top of the Display & Brightness screen from left to right until you reach your preferred level of brightness.

Step

If you turn on Auto-Brightness in the Display & Brightness screen, then the brightness level you choose is the setting your iPhone uses to determine how to adjust the screen brightness for you as you move from one lit environment to a differently lit environment. If you turn off Auto-Brightness, the brightness level you choose remains constant regardless of the environment.

Adjusting the Sensitivity

Apple doesn't provide a way to adjust the sensitivity of the iPhone's touch screen. If you find the iPhone's screen sluggish or unresponsive, try the following methods to address the problem:

  • Clean the screen. Just like any glass surface, it collects grease easily, which can interfere with the screen's sensitivity.
  • Restart and -- if necessary -- reset the iPhone.
  • Take your iPhone to an Apple Store for help.