iPhone 14 is getting hot

Hi JCarlB,

Do you notice this behavior only on YouTube or other apps that stream video, or when playing games?

It can be expected for the iPhone to get a bit warmer while doing a more intensive task especially at higher brightnesses, however you can see tips for keeping your iPhone cool here: If your iPhone, iPad, or iPod touch gets too hot or too cold - Apple Support

"Your device might get warm

You might notice that your device feels warmer when you:

• Set up your device the first time
• Restore from a backup
• Wirelessly charge your device
• Use graphics-intensive or processor-intensive apps, games, or features, including augmented-reality apps
• Stream high-quality video

These conditions are normal, and your device will return to a regular temperature when the process is complete or when you finish your activity. If your device doesn't display a temperature warning, you can keep using your device.

If your device gets too warm

iOS and iPadOS devices have built-in protections to prevent overheating. If the interior temperature of your device exceeds the normal operating range, your device will protect its internal components by attempting to regulate its temperature. Here are some of the higher ambient-temperature conditions and activities to avoid, because they might cause your device to change performance and behavior:

• Avoid leaving your device in a car on a hot day.
• Avoid leaving your device in direct sunlight for an extended period of time.
• Avoid using certain features in hot conditions or direct sunlight for an extended period of time, such as GPS tracking or navigation in a car, playing a graphics-intensive game, or using augmented-reality apps.

If the interior temperature of your device exceeds the normal operating range, you might notice these changes:

• Charging, including wireless charging, slows or stops.
• The display dims or goes black.
• Cellular radios enter a low-power state. The signal might weaken during this time.
• The camera flash is temporarily disabled.
• Performance slows with graphics-intensive or augmented-reality apps or features.

Additionally, if you're navigating, your device might show this alert and turn off the display: "Temperature: iPhone needs to cool down." Navigation still provides audible turn-by-turn directions. When approaching a turn, the display will illuminate to guide you through the turn"

If you do believe the heat is excessive or notice alerts that the iPhone has gotten too warm and needs to cool down, contact Apple Support directly for additional assistance.

• Apple Support

Take care.

Hi JCarlB,

Comparing battery life to someone else's iPhone, can be misleading. There are many factors which can attribute to battery usage, including background activity, and cellular signal, to name two.

Anyways, you can verify which apps were using the most battery for the last 24 hours. This is a great article which shows how: About the battery usage on your iPhone, iPad, and iPod touch - Apple Support

Check battery usage 

To see an overview of your battery level and activity for the last 24 hours and up to the last 10 days, go to Settings > Battery.

When you tap one of the columns on your screen, you can see which apps contributed to your battery usage during that time period, and the proportion of battery used for the app.

To see how long each app was in use on screen or in the background, tap Show Activity. Under each app, you might see these usage types:

• Background Activity means that your battery was used while the app was doing something in the background.

• Audio means that apps play audio while running in the background.

• No Cell Coverage and Low Signal means that your device is searching for a signal or being used with a low signal.

• Backup & Restore indicates that your device has been backing up to iCloud or restoring from an iCloud backup.

• Connected to Charger means the app was used only when your device was charging.

You can also see when your device was last connected to a charger and the last charge level.

For the issue with your iPhone getting too warm, we'd advise to contact Apple Support.

Apple Support

Thanks!

It’s called the Second Law of Thermodynamics. Anything that creates or uses energy does so with some loss. That lost energy is expressed as heat. So when you charge the phone it generates heat in the power source, heat in the charger circuit in the phone, and heat as the energy goes into the battery. The faster the charging, the more heat is generated. Likewise when you discharge the battery; not all of the energy from the battery gets to the circuits that use it. Some of it becomes heat. 

If you use the cellular network for voice or data, converting energy to radio frequency signals is very wasteful; only about 30% of the energy that goes into the network components comes out as radio signals, the other 70% becomes heat. And signal strength matters; a 1 bar signal requires that the phone boost its transmitter power to maintain a connection, and it isn’t linear. 1 bar uses 10 times as much energy as 4 bars. You didn’t mention your phone model, but an iPhone 12 or newer (including SE 3rd edition) with a 5G signal uses about twice as much energy as an LTE signal, and 5G towers are still not as densely distributed as LTE, so the signal is likely to be weaker, compounding the problem.