Why Is My Phone So Hot? What Causes It and How to Cool It Down Safely

Your phone is hot because something inside it is working hard, or because the air around it is already hot. Games, video, maps, a new update, a backup restore and charging all make heat. So does a sunny dashboard. Most of the time this is normal, and the phone cools down once the work stops.

The part to watch is heat with no reason. A phone that is hot in your pocket while you are not using it, day after day, has a problem worth finding. And a phone that is hot and also looks puffy needs to stop charging today.

The Short Answer

Normal heat. Gaming, streaming, video calls, navigation, setup, updates and charging. It goes away when you stop.
Outside heat. Sun, a hot car, a heated seat or a thick case. Move the phone and it cools.
Problem heat. Hot while idle, every day. Usually an app running wild, a weak signal or a worn battery.
Danger heat. Hot with a bulging back or a lifting screen. Stop charging and get it checked.
The fast fix. Unplug it, take off the case, close heavy apps and set it in the shade.

Is My Phone Too Hot? What the Phone Makers Say

Apple and Google are both clear that a warm phone is often fine. Apple says an iPhone may feel warm during setup, while restoring from a backup, after a big software update, during wireless charging, and while running games, camera apps or high quality video. Google's Pixel help lists almost the same things, plus tethering, hotspot use and big uploads or downloads.

The numbers that matter come from Apple. Apple says an iPhone is designed for air between 32 and 95 degrees Fahrenheit. It should be stored between minus 4 and 113 degrees. Apple also warns that a parked car can get hotter than that storage range, and that using a phone in very hot conditions can shorten battery life for good.

So a phone left on a summer dashboard is not just warm. It is outside the range its maker built it for.

What Your Phone Does When It Gets Too Hot

Phones protect themselves. When the heat climbs, you will usually see the phone slow down before you see a warning.

Charging slows or stops. Apple says charging, including wireless charging, can slow or pause. An iPhone may show Charging On Hold on the Lock Screen.
The screen dims. Apple says the display can dim or go black.
Signal drops. Apple says the cell radios can drop into a low power state. Google says a Pixel can turn off mobile data or Wi-Fi, including 5G.
The camera flash turns off. Both Apple and Google list this.
Apps slow down. Lower frame rates and longer waits are normal while the phone cools.
A warning screen. At a higher point, the phone shows a temperature warning. Apple says an iPhone on that screen may still make emergency calls. Google and Samsung say the phone can shut itself off if it keeps heating.

If you see a temperature warning, the phone is telling you to stop. Turn it off and let it cool.

Check the Temperature on a Pixel

Google gives Pixel owners a built in check. On a Pixel 6 or newer, open Settings, tap Battery, tap Battery diagnostics, then tap Phone is very warm. It shows advice based on how warm the phone is right now. iPhones do not have a matching screen, so watch for the signs above instead.

Why Your Phone Is Hot Right Now

The answer almost always comes down to what the phone was doing in the last ten minutes. Match your situation to one of these.

Hot While Gaming, Streaming or Using Maps

This is the most common one and the least worrying. Games and video push the chip and the screen hard. Navigation keeps the screen bright, the GPS on and the cell radio busy. Apple tells people to limit long GPS, gaming and camera use in hot weather or in the sun. Take a break and it cools.

Hot While Charging

Charging makes heat, and using the phone while it charges stacks two sources of heat at once. Wireless charging runs warmer than a cable. Samsung also says a damaged cable, or a charging port with dust, metal bits or liquid in it, can cause heat.

The fix is simple. Unplug it, close apps, let it cool, then charge again with the phone resting and the case off. If it will not charge at all once it cools, our guide on why your phone is not charging walks through the port, cable and battery checks.

Hot After an Update or a New Phone Setup

Right after a big update or a backup restore, a phone spends hours indexing photos, syncing mail and rebuilding its files. Apple and Google both list this as a normal cause of warmth. Give it a night on the charger. If it is still hot two or three days later, it is no longer the update.

Hot With a Weak Signal

When the signal is weak, the phone pushes its radio harder to hold on to a tower. Samsung lists weak signal, no reception and roaming as causes of heat, and also names the mobile hotspot. Google suggests using Wi-Fi instead of mobile data when you can. If your phone keeps dropping to SOS where you live, our guide to why your phone is on SOS explains why.

Hot While Sitting in Your Pocket

This is the one to take seriously. If the phone is warm with the screen off, something is running in the background. Open the battery screen in Settings and look for an app at the top that you barely used. That app is your suspect. Update it, force close it or delete it.

A worn battery can also run warm. On an iPhone, open Settings, tap Battery, then tap Battery Health. Apple says iPhone 14 and older batteries are built to keep 80 percent of their capacity after 500 full charge cycles, and iPhone 15 models after 1,000. A battery far below that can make a phone heat up and die fast.

Hot and Acting Strange

Malware can make a phone hot by running hidden work. It is real, but it is not common, and heat alone does not prove it. Look for other signs too, like apps you did not install, pop ups or a battery that drains overnight. Our guide on how to tell if your phone is hacked has the full checklist.

How to Cool Down a Hot Phone Safely

Do these in order. Most phones feel normal again within a few minutes.

Unplug it. Charging adds heat. Samsung and Google both say to disconnect it first.
Take off the case. A thick case holds heat in. Google says to use only cases made for your model.
Close the heavy stuff. Games, video, camera and maps. Turn off the hotspot.
Turn the brightness down. Google and Samsung both list this as a way to cut heat.
Move it out of the sun. Put it in the shade or indoors, on a hard surface, not a bed or a couch.
Turn it off if it showed a warning. Apple says to turn the phone off, move it somewhere cooler and wait before using it again.
Set the refresh rate to Standard on a Galaxy. Samsung says a high refresh rate uses more power, and suggests Standard mode while the phone runs hot.

What Not to Do

The fridge and freezer are a bad idea. Xfinity's guide warns against them too, because a fast swing from hot to cold can leave moisture inside the phone. Do not leave it on a heating pad, near a heater or next to a hot stove or microwave. Samsung warns against all of those.

The Advice We Disagree With

Some of the pages that rank for this question tell you to install a cleaner app or an antivirus app to fix a hot phone. We would skip that. Apple's own heat page never mentions background apps or cleaners as the fix. Its answer is to stop the heavy work, get out of the heat and let the phone cool. A cleaner app is one more app running in the background, which is the opposite of what a hot phone needs.

The other gap is battery safety. Most top results never mention a swollen battery at all. That is the one case where heat stops being a nuisance and turns into a fire risk.

When a Hot Phone Is a Battery Problem

Heat is hard on lithium batteries. Samsung's support page warns that overheating can cause battery leakage, and that poor conditions can cause a fire. A battery that is failing can also swell.

Check for these signs.

The back of the phone bulges or does not sit flat on a table.
The screen is lifting away from the frame, or there is a gap at the edge.
The phone rocks when you set it down.
It gets hot in the same spot even when it is off.

If you see any of them, stop charging the phone. BGR, citing the London Fire Brigade, says to stop charging and turn the phone off, and not to open the case yourself. Keep it away from anything that burns and take it to the maker or a repair shop. Do not press on the bulge or try to flatten it.

If the battery is fine but the phone is old and runs hot every day, it may be time to weigh a battery swap against a new phone. Our guide to when to replace your phone helps you decide.

The Bottom Line

A hot phone is usually a busy phone. Gaming, video, maps, charging, updates and summer heat all warm it up, and Apple and Google both say that is normal. Unplug it, take off the case, close heavy apps and move it into the shade. Never use the fridge. If it is hot with nothing running, find the app or check the battery. And if the back bulges or the screen lifts, stop charging it and get it looked at today.

Keep Reading

Phone makers change their battery and heat settings with almost every update. Follow the latest in our devices news, or browse more plain tech advice.

Questions Readers Ask

Why is my phone so hot?

Your phone makes heat whenever its processor, battery, screen or radios work hard. Gaming, streaming, navigation, video calls, setting up a new phone, installing an update and charging all do it. Heat from the air matters too. A phone in the sun or in a hot car warms up even when you are not using it.

Why did my phone suddenly get super hot?

Look at what changed. A big update, a backup restore, a new app, a weak signal or fast charging can all heat a phone up quickly. If it gets hot with nothing running and it keeps happening, check the battery screen in Settings for an app using far more power than it should.

How do I stop my phone from being hot?

Unplug it, take off the case, close games and video, and turn the screen brightness down. Move it out of the sun and away from car dashboards. Let it sit until it feels normal before you charge or use it again.

How can I cool down my phone fast?

Turn it off and set it in the shade on a hard surface with the case off. That stops the work making the heat and lets the heat leave. Do not put it in the fridge or freezer. A sudden temperature change can leave moisture inside the phone.

Is phone overheating a virus?

It can be, but it is rarely the first thing to suspect. Heavy apps, charging, weak signal and hot weather are far more common. If your phone is hot while idle and also shows pop ups, strange apps or fast battery drain, read our guide on how to tell if your phone is hacked.

Is it bad if my phone gets hot when charging?

A little warmth while charging is normal, and wireless charging runs warmer. Apple and Google both say the phone slows or pauses charging when it gets too hot. If it gets too hot to hold, unplug it, take off the case and let it cool before you plug it back in.

Can a hot phone explode?

It is rare, but heat is hard on lithium batteries. Samsung warns that poor conditions can lead to battery leakage or fire. A swollen battery is the warning sign. If the back bulges or the screen lifts, stop charging it, power it off and take it to a repair shop.