How to Calibrate iPhone Screen Brightness
If the iPhone Auto-Brightness sensor isn’t working properly, the phone responds inappropriately to changes in lighting. The issue may arise because Auto-Brightness adjusts partly based on where the value was set when the feature was turned on. Here’s how to recalibrate the Auto-Brightness sensor:
How to Calibrate iPhone Motion Sensors and Compass
Many apps use the iPhone motion sensor, accelerometer, and compass. When any one of these stops working properly, the iPhone recalibrates the app automatically as long as Location Services are switched on. Here’s how to make sure that your device is handling this for you:
How to Calibrate the iPhone Battery
The iPhone battery needs to be calibrated when the phone gives inaccurate percentages. The phone may show a low percentage but last an hour or two longer. Or, it may show a full battery and shut down suddenly. Calibrate the iPhone battery to fix the way the phone monitors and reports the percentage of remaining battery power. The method to perform a soft reset varies with the iPhone model:
For models earlier than iPhone 7 (such as iPhone SE, 6S, 6, 5S, 5, 4S, and 4), simultaneously hold the Sleep/Wake button and the Home button for 10 seconds.For the iPhone 7 and 7 Plus, hold the Volume Down button and the Sleep/Wake button for 10 seconds.For the iPhone X, 8, and 8 Plus, press and release the Volume Up button, press and release the Volume Down button, then press and hold the Side button until the Apple logo appears.
When the phone is reset, it should give a more accurate indication of its battery status. If problems persist, it may be necessary to replace the battery.
