If your iPhone 15 feels unusually warm, it's often a temporary issue with a simple fix. Modern phones generate heat during intense tasks, but consistent overheating can signal a problem. Let's get it cooled down.
Start with the quickest solution. A simple force restart can clear out software glitches causing the processor to work overtime. On your iPhone 15, press and quickly release the Volume Up button, then the Volume Down button. Finally, press and hold the Side button until you see the Apple logo appear.
This doesn't erase any data, and I've seen it resolve a surprising number of random heat issues. Give it a minute to reboot completely before checking if the temperature has normalized.
Check Your Charging Setup
Charging is one of the most common times for an iPhone 15 to get warm. Since this was Apple's first iPhone with USB-C, it's crucial to use the right gear. Make sure you're using a USB-C cable and a compatible power adapter, not an old Lightning cable by mistake.
Your phone supports up to 27W wired charging and 15W with MagSafe. Using a higher-wattage charger than it can handle won't make it charge faster, but it can definitely make it hotter. Stick with Apple's recommended 20W or 30W USB-C power adapter for the best balance of speed and temperature.
Also, take a look at your case. Thick or poorly designed cases can trap heat, especially during wireless charging. If your phone gets hot while charging on a MagSafe or Qi2 charger, try removing the case. Some users report their phones run much cooler on the charger without a case, or with one specifically designed for MagSafe compatibility.
Review Your Battery and Settings
Head to Settings > Battery. Here, you'll find a feature called "Charging Optimization." If it's set to "80% Limit," your phone will intentionally stop charging at about 80% to preserve long-term battery health. This is great, but it can confuse users who think their phone won't charge past 80% and is getting hot trying.
This setting can cause the phone to manage power more actively, which might generate some warmth. You can switch it to "Optimized Battery Charging" or "None" if you prefer, though the 80% limit is genuinely good for your battery over years of use.
While you're in the Battery settings, check the "Battery Health" section. Tap on it to see your battery's maximum capacity. A significantly degraded battery (below 80% capacity) has to work harder to supply power, which can lead to more heat generation during everyday use.
Identify and Close Demanding Apps
Sometimes, a single app is the culprit. Graphics-intensive games, video editing software, or apps using augmented reality (AR) can push the A16 Bionic chip hard, generating noticeable heat. This is normal during active use, but the phone should cool down after you close the app.
If the phone stays hot, an app might be stuck running in the background. Swipe up from the bottom of the screen and pause in the middle to enter the app switcher. Swipe up on any apps you're not using to close them fully. Pay special attention to navigation, video streaming, or social media apps with auto-playing video.
You can also see which apps are using the most battery, which often correlates with heat. Go to Settings > Battery. The chart will show your activity, and below it, a list of apps and their battery usage. If an app you barely used is high on the list, it might be misbehaving in the background.
Update iOS and Manage Background Activity
Always make sure your iPhone 15 is running the latest version of iOS. Apple frequently releases updates that include performance optimizations and bug fixes, some of which directly address thermal management. Go to Settings > General > Software Update to check.
Background App Refresh can keep apps updating their content even when you're not using them, which uses power and generates a little heat. You can manage this globally or per-app. Navigate to Settings > General > Background App Refresh. You can turn it off entirely, or just for specific, non-essential apps.
Location services are another background activity that can contribute. Go to Settings > Privacy & Security > Location Services. Review which apps have "Always" access and consider changing them to "While Using the App" or "Ask Next Time" where it makes sense.
Let Your Phone Cool Down Physically
If your iPhone 15 is already hot, the most important step is to stop using it and let it cool. Remove it from any case to help dissipate heat faster. Don't place it in the refrigerator or freezer, as sudden extreme temperature changes can cause condensation inside the device.
Instead, just set it down on a cool, hard surface like a table or countertop. Avoid leaving it on a soft sofa, bed, or in direct sunlight. Also, avoid charging it while it's overheated, as this adds more thermal stress. Wait until it returns to a normal temperature before plugging it in again.
If you're outdoors on a hot day, try to keep the phone in the shade. Using navigation with the screen on full brightness while the phone is sitting on a hot car dashboard is a surefire way to trigger an overheating warning. In those cases, using a vent mount can help keep it cooler with the car's air conditioning.
