If you're an iPhone user, you probably know that the brightness of your phone's screen automatically adjusts depending on the amount of light the phone detects in the environment. While it can be a pretty useful feature that helps combat eye fatigue and makes the screen a little easier to see, auto-brightness isn't always as useful as it could be.

The problem may be that the screen automatically dims even when you are in the sun. If you are partially in the shade, your phone may be tricked into automatically dimming the screen, even if it is not necessary. This can make it difficult to see what is on the screen. If you manually increase the brightness, it will decrease again because of automatic brightness. Solving this problem isn't always as easy as disabling the necessary settings – but it's a good place to start.

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We'll show you two settings you need to turn off to help prevent your iPhone from automatically dimming. Be aware that your iPhone can still automatically adjust brightness even when these two settings are turned off.

While you're here, you should also check out everything we know about the iPhone 15 and what you need to know about the iOS 17 Beta.

First, turn off auto-brightness

Yes, this may seem a little obvious, but the first thing you want to do is make sure that auto-brightness is turned off in your settings. The feature is pretty self-explanatory – it automatically adjusts the brightness depending on the ambient light. If you want to prevent your screen from always trying to adjust, you should disable this feature.

In the Settings app, go to Accessibility > Text display and size and turn off Automatic brightness at the bottom of the page. You would think this setup would exist in Screen and brightnessso it's not uncommon for auto-brightness to turn on without you knowing, since it's hidden Accessibility.

Auto-brightness settings on iOS Auto-brightness settings on iOS

Auto-brightness is hidden in accessibility settings.

Screenshots by Nelson Aguilar/CNET

If the brightness continues to adjust automatically, there is another setting you need to disable.

You also need to turn off True Tone

If you have one iPhone SE (2nd generation) and laterO True Tone The feature measures the color temperature and brightness in your environment and then adjusts your display to match it. True Tone is useful when you want it to be – not only does it help show more accurate colors in various lighting situations, but it's also easier on the eyes, which you need if you're constantly reading on your phone.

Again, if you don't care for the feature, don't use it, or are simply annoyed that the brightness continues to adjust automatically, you need to disable it. In settingsGo to Screen and brightness and turn off True Tone under Shine header. As long as auto-brightness is also turned off, turning off True Tone should stop your iPhone from automatically adjusting brightness.

True Tone Setup on iOS True Tone Setup on iOS

If auto-brightness is turned off and the screen continues to adjust on its own, this could be the culprit.

Screenshot by Nelson Aguilar/CNET

An exception applies.

Don't let your iPhone overheat

Your iPhone has several ways to protect its internal components, and this includes automatically dimming the screen. Even if you have auto-brightness and True Tone turned off, if your iPhone is overheatingit will automatically adjust the display intensity.

According to Apple, to help prevent this from happening, you should use your iPhone in temperatures between 32 and 95 degrees F (zero and 35 degrees C) and store it in temperatures between 4 and 113 degrees F (between minus 20 and 45 degrees C) . If you leave your iPhone in the car or on the sidewalk on a hot day, or even if you try to use it at the pool or beach on a hot day, there's a good chance it will overheat and cause the screen to automatically dim.

An iPhone overheating An iPhone overheating

You will see a warning message if your phone gets too hot.

Jason Cipriani/CNET

Overheating doesn't just happen because of a sunny day. A faulty battery can also cause your iPhone to overheat: Go to settings > Battery > Battery Health and check if your battery needs to be replaced. Another reason could be buggy software: go to settings > In general > Software update and more certainty of always being up to date to deal with any bugs and software problems.



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