Phone Overheating? 10 Real Fixes That Actually Cool It Down

A hot phone is scary. The back feels like a stove, the screen dims, games stutter, and the battery drains in front of your eyes. The good news: overheating is almost always caused by a handful of fixable things, and only rarely by broken hardware. Here’s how to cool your phone down right now, figure out what caused it, and stop it from happening again.

The quick answer: if your phone is overheating, stop charging it, close your apps, turn off hotspot and GPS, take the case off, and move it out of the sun: never put it in the fridge, since condensation can cause real damage. Once it’s cool, find the cause: it’s usually a runaway app (check battery usage stats), navigation or hotspot running for long stretches, gaming while charging, a cheap charger, or a battery that’s simply worn out. Fix those and a healthy phone should only get warm, not hot.

First: cool it down the right way

Do these in order. They work faster together than any single one:

1. Unplug it. Charging generates heat on its own; charging while hot compounds the problem.
2. Close everything. Open Recent Apps and swipe them all away. One misbehaving app in the background is the most common culprit.
3. Kill the radios. Turn off mobile hotspot, Bluetooth, GPS, and if the signal is weak, switch to airplane mode for a few minutes. A phone hunting for signal runs its modem hard.
4. Take the case off. Cases trap heat, especially thick rugged ones.
5. Get it out of the sun. Direct sunlight can push a phone from warm to shutdown-hot in minutes, especially on a car dashboard.
6. Point a fan at it or just set it on a cool, hard surface. Metal and stone conduct heat away; a sofa or bed insulates it.

What NOT to do: never put a hot phone in the fridge or freezer. The sudden temperature swing creates condensation inside the phone, and moisture kills electronics far more reliably than heat does.

Now find what’s causing it

Check which app is burning the battery

Go to Settings → Battery → Battery usage. Whatever sits at the top of that list with an unusually high percentage is your prime suspect. Common offenders: navigation apps left running, video apps, social apps with autoplay video, and anything doing background sync gone wrong. If one app is way out of line, force-stop it, clear its cache, and update it, or uninstall and reinstall if it keeps misbehaving.

Gaming and camera sessions

Long gaming sessions and extended 4K video recording are the two heaviest legitimate workloads on a phone. Heat here is normal, but you can reduce it: lower the game’s graphics settings or frame rate cap, drop video recording from 4K/60 to 1080p/30 when you don’t need more, and take breaks. If your phone has a game mode (most do now), its performance limits exist exactly for this.

Charging habits

Four charging-related causes show up constantly:

• Using the phone heavily while fast-charging. Both generate heat; together they can be too much. Let it charge in peace when you can.
• Cheap uncertified chargers and cables. They deliver dirty power the phone has to work harder to manage. Use the original charger or a certified replacement from a known brand.
• Charging under a pillow or on a bed. No airflow. Charge on a hard surface.
• A dirty charging port. Apple’s own support documentation treats a wet port as a hazard: newer iPhones will refuse to charge through moisture because it can corrode the pins. Dry lint is a smaller but real risk too, since packed in debris can bridge the port’s contacts and create a localized short circuit, generating heat right at the port rather than a general phone wide problem. Clear it with a soft brush or a wooden toothpick, never metal.

Hotspot, navigation, and weak signal

Running a mobile hotspot for hours, using turn-by-turn navigation on a long drive (screen on + GPS + data simultaneously), or sitting in an area with one bar of signal all push the modem continuously. If your phone runs hot on every commute, mount it away from the windscreen sun and pre-download offline maps: offline navigation runs dramatically cooler.

Where you mount the phone in the car matters more than most guides admit. An AC vent mount runs cooler than propping the phone on the dashboard in direct sun, because the vent blows conditioned air straight onto the back of the phone while the dashboard bakes it. Engadget covers the same ground. One catch: don’t blast cold air on a phone that’s already baked hot on a dark dashboard. The sudden temperature swing risks condensation forming inside the phone, the same damage the fridge warning above is about.

If it overheats even when idle

A phone that gets hot while doing nothing points to a software or battery problem:

1. Update everything. Install pending system updates and app updates: overheating bugs get patched more often than you’d think.
2. Restart the phone. Clears stuck background processes. If you haven’t restarted in weeks, do it now.
3. Check for a rogue recent install. Did the heat start after installing a particular app? Uninstall it and watch for a day. Apps from outside the Play Store are worth extra suspicion: some carry hidden crypto miners that cook phones.
4. Run Play Protect. Open Play Store → profile icon → Play Protect → Scan. It catches known malicious apps.
5. Check battery health. An old, degraded battery runs hotter. On many phones you can see battery health under Settings → Battery. The old *#*#4636#*#* testing menu still works on some stock-Android handsets, but Samsung and most recent devices have removed it, so treat it as a long shot rather than a reliable check. A battery several years old that drains fast and runs hot is telling you it’s done. A battery replacement is far cheaper than a new phone.

Stop it happening again

• Keep auto-update on for apps and install system updates promptly.
• Use certified chargers, and avoid heavy use during fast charging.
• Don’t leave the phone in direct sun or a parked car.
• Restart weekly (or schedule an auto-restart if your phone supports it).
• Thick case + fast charging + summer = trouble. Slip the case off when charging on hot days.
• Keep at least 10-15% storage free. A completely full phone works harder at everything.

Sometimes it really is a bug, not you

Chronic overheating usually traces back to something on your phone, but not always. Two real, confirmed cases worth knowing about:

• iOS 17 (2023). Apple confirmed that a bug in iOS 17, made worse by specific apps including Instagram, Uber, and the game Asphalt 9, caused overheating for some users, most visibly on the new iPhone 15 Pro. The fix shipped as iOS 17.0.3. If your iPhone runs hot right after a system update, an update to fix that update may already be out.
• Google app, Pixel (May 2023). Google acknowledged that a server side change to its own Google app caused heavy battery drain on a batch of Pixel devices, with users also reporting the phones running warm (9to5Google), fixed with no user action required once Google rolled back the change. Not every overheating bug comes from a shady third party app: sometimes it’s the manufacturer’s own default software.

If your phone started running hot right after a specific system update and you’re not the only one, a quick search of your phone model plus “overheating” plus the update version will usually confirm it fast. The fix is often already shipped or on the way, not a setting you’re missing.

How to actually measure the heat, not guess

If you want real numbers instead of “it feels hot,” a few genuine options exist beyond touching the back of the phone:

• On Android, with a computer. Enable developer options and USB debugging, connect via USB, then run adb shell dumpsys thermalservice from a terminal. It pulls Android’s actual internal thermal sensor readings, CPU, GPU, battery, and skin temperature zones, straight from the system, far more precise than Settings.
• On the phone itself. Apps like Device Info HW, CPU-Z, or 3C Toolbox read out the same hardware sensors most manufacturers expose. Results vary by phone: some budget devices only expose a battery sensor, not a true CPU reading, so treat the number as a floor, not the whole picture.
• No app needed. A cheap infrared thermometer aimed at the camera bump, usually the hottest external point, gives a genuine external reading in seconds.

When it’s time for a repair shop

See a technician if the phone gets hot every day even after a restart and app cleanup, if it shuts down from heat regularly, if the battery is visibly swollen (back cover lifting: stop using it immediately), or if it started overheating right after a drop or water exposure. Those are hardware symptoms, and no settings tweak fixes hardware.

What’s actually happening inside a hot phone

Understanding the mechanics makes the fixes make sense, and helps you judge how worried to be.

Your battery has a comfort zone. Lithium-ion batteries are happiest between roughly 15°C and 35°C. Battery research consistently shows that heat is the number one ager of batteries: a cell that lives around 45°C degrades more than twice as fast as one kept at 25°C. That’s why chronic overheating quietly costs you battery capacity months down the line, even when nothing “breaks” today. There’s a cold side too: batteries physically can’t charge safely below 0°C, which is why your phone may refuse to charge on a freezing morning. That’s protection, not a fault.

Your processor protects itself by slowing down. When the chip gets too hot, the phone deliberately reduces its speed. That’s thermal throttling, and it’s why a hot phone stutters in games and feels laggy. The dimming screen, the paused fast charging, the camera app saying it needs to cool down: all deliberate self-defence, triggered in stages as temperature climbs. If things get extreme, the phone shuts off entirely rather than cook its components. In other words, the lag and dimming aren’t the problem. They’re the phone handling the problem. Your job is to remove the cause so it doesn’t have to.

Some heat sources are invisible. Two that surprise people: wireless charging runs inherently warmer than cable charging because energy transfer through a coil is less efficient. The loss becomes heat right against the phone’s back. And 5G, especially with a weak signal, works the modem harder than 4G did; if your phone runs warm all day in a patchy 5G area, switching preferred network to 4G/LTE in SIM settings is a legitimate cooling tweak that most people never think of.

Why flagships handle heat better. Modern flagship phones ship with vapor chamber cooling. A thin sealed plate of liquid that evaporates at the hot spot and condenses at the cool side, spreading heat across the phone’s body. Budget phones mostly rely on simple graphite sheets, which is why the same game warms a budget phone faster. If you’re a heavy gamer choosing a phone, cooling hardware is genuinely worth checking in reviews, and it’s why clip-on cooling fans, silly as they look, measurably help sustained gaming performance.

The chip inside matters more than most buyers realize. GSMArena’s own hour long stress test on two versions of the same Galaxy S21 Ultra found the Snapdragon 888 model held onto 77 percent of its peak performance after an hour of sustained load, while the Exynos 2100 model dropped to 56 percent, a gap wide enough to show up as real frame rate loss in long gaming sessions. Samsung’s own fix for this generation gap was to drop Exynos from flagship phones worldwide starting with the Galaxy S23, going Snapdragon only everywhere. iPhones are not immune either: independent testing by Geekerwan, reported by Notebookcheck, recorded the iPhone 15 Pro Max hitting 48°C on its surface during extended Genshin Impact sessions, with frame rates dropping by roughly a third as the A17 Pro throttled to manage heat. A high benchmark score says little about how a chip performs twenty minutes into a game.

Frequently asked questions

Is it normal for my phone to get warm while charging?

Warm, yes: especially with fast charging. Hot enough to be uncomfortable to hold, no. If it’s hot, unplug, take the case off, and try a different certified charger.

Does overheating damage the battery permanently?

Sustained high temperatures do accelerate battery ageing. An occasional hot afternoon won’t ruin it, but a phone that runs hot daily for months will lose capacity noticeably faster. That’s the real reason to fix chronic overheating, even if the phone still “works.”

Can a phone case really cause overheating?

A case alone rarely causes it, but it makes every other cause worse by trapping heat. Rugged and wallet cases are the worst offenders. If you’re troubleshooting heat, go caseless for a day and compare.

Why does my phone overheat only in summer?

Batteries and processors both have to work within a temperature budget. When the air is already 35°C+, there’s simply less headroom before the phone throttles. All the prevention tips above matter double in hot weather: especially keeping it out of the sun and off the dashboard.

Does having two SIM cards make a phone run hotter?

It can. Dual SIM phones keep both SIM profiles registered with their networks in the background even when you’re only using one, so the modem does continuous extra work. It’s most noticeable when one of the two SIMs has a weak or roaming signal, itself a known heat driver on its own.

Does switching from 120Hz to 60Hz actually help with overheating?

Barely. Real world measurements put the power difference between refresh rates at only tens of milliamps, a small fraction of what brightness costs. Keeping the screen at maximum brightness for a long GPS session or video call generates far more sustained heat than the refresh rate ever will, so turn brightness down first if you’re chasing heat and battery savings from the display.

Getting an overheating warning on a Samsung when the phone actually feels cool is a different problem with different causes. We cover that separately in why your Samsung shows an overheating warning when the phone feels cool.