Why does my iPhone screen keep dimming by itself?

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How to adjust iPhone brightness and dimming

Adjusting your brightness level is quite simple, and there are two different ways to go about it.

Do you ever open up your iPhone and realize that your screen is a lot dimmer than it was an hour ago? Well, this isn't a coincidence. It's an automatic measure that Apple programmed into every iPhone device as a battery-saving measure. 

The brightness will adjust by itself depending on how much light is in your surrounding environment. The less light you have around you, the dimmer your screen will get. 

Perhaps you'd rather have your iPhone at the same brightness level at all times. Maybe you struggle with your eyesight and simply see better when your phone is at a higher brightness level regardless of if you're in a dark place or not. 

The good news is, there's a way to adjust your iPhone's brightness level so that it never switches up on you again.

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The brightness will adjust by itself depending on how much light is in your surrounding environment. The less light you have around you, the dimmer your screen will get.? (Cyberguy.com)

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How do I adjust the brightness level on my iPhone? 

Adjusting your brightness level is quite simple and there are two different ways to go about it. The first way goes as follows: 

• Open your iPhone and use your finger to swipe down from the top right-hand corner of the screen

The brightness will adjust by itself depending on how much light is in your surrounding environment. The less light you have around you, the dimmer your screen will get.? (CyberGuy.com)

• Go to the Brightness icon and slide up and down until you get to a level you're comfortable with

Here's how to adjust the brightness on your iPhone. (CyberGuy.com)

The other way to adjust your brightness levels on your iPhone is as follows: 

• Open your Settings app on your iPhone
• Scroll down and select Display & Brightness

Go here to adjust the brightness on your iPhone. (CyberGuy.com)

• Go to the brightness slider and slide it to the left or right until you get to a level you're comfortable with

Here's how to adjust the brightness on your iPhone. (CyberGuy.com)

How do I keep the brightness level from automatically dimming? 

There are two things you need to do to keep your phone brightness at the same consistent level, and both require you to adjust in your Settings app. 

The first is by turning off Auto-Brightness (this only applies to those with iPhone 14 Pro and Pro-Max models and later) and the second is turning off True Tone. 

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How to turn off Auto-Brightness

• Open the Settings app and go to Accessibility
• Scroll down and select Display & Text Size
• At the bottom of the menu is the Auto-Brightness option. Toggle this off

How to turn off True Tone

Here's how to turn off your iPhone's True Tone. (CyberGuy.com)

• Open your Settings app
• Scroll down and select Display & Brightness
• Underneath the brightness slider is the True Tone option. Toggle this off

Here's the slider to turn True Tone on or off. (CyberGuy.com)

What else can I do to prevent my brightness level from changing? 

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The biggest thing you can watch out for so that your brightness levels remain the same is to not allow your iPhone to overheat. Even if you have Auto-Brightness and True Tone turned off, your iPhone will automatically turn the brightness level down if the device is overheating as a safety measure. 

Your phone can overheat sometimes in just seconds if it is left in the sun or any hot location (e.g. inside a car) for too long. It can also overheat if you have a faulty battery that needs to be replaced. 

How do I check the status of my phone battery? 

Go to Settings 

Scroll down and select Battery

Here's how to check your iPhone's battery status. (CyberGuy.com)

Select Battery Health & Charging 

This screen will show the battery status level for your iPhone. (CyberGuy.com)

A display will appear of the health level of your battery.

This screen shows your battery's health level. (CyberGuy.com)

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If your maximum capacity is below 80%, Apple recommends looking into getting a new battery.

For more Apple tips, head over to CyberGuy.com and search "Apple" and be sure to subscribe to my free CyberGuy Report Newsletter at CyberGuy.com/Newsletter.