If your phone feels warm, it does not automatically mean something is wrong. Smartphones naturally generate heat while charging, playing games, recording video, restoring backups, downloading large files or using demanding apps.
However, repeated overheating is different. If the phone becomes uncomfortable to hold, displays a temperature warning, stops charging, shuts down or becomes unusually hot during light use, it deserves investigation.
The cause may be as simple as direct sunlight or a power-hungry app. Alternatively, the problem could involve the charger, battery, charging port or another internal component.
Apple, Samsung and Google all build thermal protections into their phones. When temperatures rise too far, devices can slow charging, reduce performance and temporarily disable functions while they cool.
Here are 15 common reasons your phone may be overheating and what to do next.
Is it normal for a phone to get warm?
Yes.
A phone contains a processor, battery, wireless radios, display and other components that produce heat while working.
Some activities naturally generate more heat
For example, your phone may feel noticeably warmer while:
- charging;
- playing demanding games;
- recording high-resolution video;
- using navigation;
- making a long video call;
- restoring from a backup;
- installing a major software update;
- using the phone as a hotspot;
- uploading or downloading large amounts of data.
Apple, Samsung and Google all describe temporary warmth during demanding tasks as normal behaviour.
Therefore, the important question is not simply whether the phone feels warm. It is whether the temperature is proportionate to what the device is doing.
When does a warm phone become an overheating problem?
Look at the behaviour around the heat.
A slightly warm phone during fast charging may be perfectly normal. By contrast, a handset that becomes extremely hot while sitting idle deserves more attention.
Warning signs include:
- a temperature warning on screen;
- charging repeatedly stopping because of temperature;
- the display becoming much dimmer;
- camera functions becoming unavailable;
- performance dropping dramatically;
- mobile connectivity being reduced;
- the device shutting itself down;
- visible battery swelling;
- heat continuing long after demanding activity stops.
Modern phones deliberately restrict themselves when thermal limits are reached.
1. Your phone is charging
Charging a lithium-ion battery generates heat.
Therefore, some warmth around the battery or charging area is normal.
Fast charging can produce more noticeable heat
Modern phones can accept relatively high charging power.
However, the phone’s charging system monitors temperature and can reduce charging power when necessary.
Apple, for example, may slow or pause charging if an iPhone becomes too warm or too cold.
Samsung similarly states that charging can stop when the device moves outside an acceptable temperature range.
What should you do?
If the phone becomes unusually hot while charging:
- disconnect the charger;
- stop demanding apps;
- move the phone away from direct sunlight;
- let it cool naturally;
- check the cable and adapter for damage.
Once the temperature returns to normal, test charging again.
2. You are using the phone heavily while charging
Charging produces heat.
Gaming, navigation and video also produce heat.
Doing both at the same time can therefore raise temperatures considerably.
Gaming while charging is a common example
The processor and graphics hardware may be working hard while the battery is simultaneously accepting power.
As a result, the handset has two significant sources of heat at once.
If overheating happens mainly while gaming on charge, try playing without the charger connected or give the phone a break until it cools.
3. The phone is sitting in direct sunlight
External heat can be as important as internal heat.
A perfectly healthy phone can overheat when left on a car dashboard, windowsill or table in direct sun.
Cars are particularly risky
The temperature inside a parked vehicle can rise far above the surrounding outdoor temperature.
Apple says iPhone is designed for use in ambient temperatures between 0°C and 35°C.
Google similarly warns users not to leave Pixel devices in very hot cars or other areas exposed to excessive heat.
Move the phone somewhere cooler
Place it out of direct sunlight and stop using it while it cools.
Do not put an overheated phone into a freezer or expose it to sudden extreme cooling.
4. A demanding game is using the processor heavily
Modern mobile games can push a phone’s CPU and graphics processor hard for long periods.
That consumes power and produces heat.
High frame rates create more work
Games running at high refresh rates, maximum graphics settings or high screen brightness can generate more heat than lighter applications.
Samsung specifically lists power-intensive applications and higher refresh rates among factors that can increase device temperature.
Reduce the workload
Try:
- lowering graphics settings;
- reducing screen brightness;
- using a lower refresh rate where appropriate;
- closing other demanding apps;
- taking breaks during long sessions.
If the heat disappears when the workload drops, the phone may be behaving normally.
5. The camera is working hard
High-resolution video recording can generate substantial heat.
The camera sensor, image processor, storage and display may all be working continuously.
4K and other demanding modes can increase temperature
Long recording sessions can therefore make a handset noticeably warm.
Apple and Google both identify extended camera use or high-definition video recording as activities that can increase device temperature.
If a temperature warning appears, stop recording and allow the handset to cool.
6. Navigation and GPS are running for a long time
Navigation combines several demanding functions.
The screen stays on, GPS remains active, mobile data may be transferring continuously and the processor keeps calculating routes.
Using navigation in a car adds another heat source
A phone mounted behind a windscreen may also sit in direct sunlight.
Meanwhile, many drivers keep the handset plugged into a charger.
That combination can produce significant heat.
Move the device away from direct sun where possible and ensure air can circulate around it.
7. Mobile signal is poor
Your phone’s radio has to communicate with nearby mobile networks.
When signal quality is poor, the device may work harder to maintain a usable connection.
This can increase battery use and heat
Weak signal alone does not always cause obvious overheating.
However, it can add to other demanding activities such as streaming, navigation or hotspot use.
If the phone becomes much hotter in one location than another, network conditions may be one contributing factor.
8. You are using the phone as a hotspot
Tethering or hotspot use makes the phone perform several jobs simultaneously.
It maintains a mobile-data connection while also providing connectivity to another device.
Google specifically identifies hotspot use as a heat-generating activity
Long hotspot sessions can therefore make a Pixel or other smartphone noticeably warm.
If the device becomes too hot, stop tethering temporarily and allow it to cool.
9. The phone is restoring or setting itself up
A new phone can run surprisingly hot during the first few hours of use.
That does not necessarily mean it is defective.
Background work can be intensive
During setup, a phone may be:
- downloading apps;
- restoring photographs;
- indexing files;
- syncing cloud data;
- installing updates;
- processing account information.
Apple and Google both identify setup or backup restoration as situations where a phone may become warm.
Once the background work finishes, temperatures should usually settle.
10. A software update has just been installed
Major operating-system updates can trigger temporary background activity.
Consequently, battery consumption and heat may rise for a period after installation.
Do not judge the phone immediately after a major update
Give the device time to finish background processing.
However, if overheating continues for days during light use, investigate further.
Also make sure the operating system and apps are fully updated because manufacturers sometimes fix abnormal battery or thermal behaviour through software updates.
11. A background app is consuming too much power
An app does not need to be visible on screen to use battery power.
A malfunctioning or poorly behaving app can run background processes repeatedly.
Battery usage can reveal the culprit
Check your phone’s battery settings for unusually high usage.
If one application consumes far more power than expected, update it first.
Alternatively, force close or uninstall the app temporarily and see whether the overheating disappears.
12. Wireless charging is generating extra heat
Wireless charging is convenient, but energy transfer through charging coils can generate heat.
Some warmth is therefore normal.
Alignment matters
Poor positioning can make charging less efficient.
Samsung also warns against placing metal objects, magnets or magnetic-stripe cards between a wireless charger and phone.
In addition, a thick case can trap heat.
If wireless charging regularly makes the phone excessively hot, remove the case, check alignment and try a suitable compatible charger.
13. The phone case is trapping heat
A case does not normally cause a healthy phone to overheat by itself.
However, some thick or poorly ventilated cases can make it harder for heat to dissipate during demanding use.
Test the phone without the case
If overheating mainly happens during charging or gaming, remove the case temporarily and compare the result.
Google recommends using covers designed for the specific phone and avoiding enclosed situations when a device is running hot.
14. The battery is ageing or damaged
Lithium-ion batteries are consumable components.
As they age, their performance and capacity decline.
Heat and battery ageing affect each other
Apple warns that prolonged exposure to high temperatures can permanently shorten battery lifespan.
Therefore, repeated overheating is not something to ignore simply because the phone still works.
An ageing battery may also contribute to unusual performance, rapid discharge or unexpected shutdowns.
Check battery health where available
iPhone provides battery-health information in Settings.
Many Android manufacturers also provide battery diagnostics or service tools.
If the battery performs poorly as well as producing unusual heat, professional assessment may be worthwhile.
15. The battery is swelling
Battery swelling is different from normal heat.
A swollen battery can push against the screen or rear cover and physically deform the handset.
Look for physical warning signs
These can include:
- a screen beginning to lift;
- the back panel separating;
- new gaps around the housing;
- the phone no longer sitting flat;
- pressure marks on the display.
Google specifically advises Pixel users not to press the cover back down, pry open the device or attempt to fix a swollen battery themselves.
Why does my iPhone say it needs to cool down?
iPhone contains built-in thermal protections.
If its internal temperature moves outside the normal operating range, iOS can automatically change device behaviour.
You may notice:
- charging slowing or stopping;
- the display dimming;
- camera flash becoming unavailable;
- reduced performance;
- weaker cellular signal;
- a temperature warning screen.
If the warning appears, Apple recommends turning the device off, moving it somewhere cooler and allowing it to cool naturally.
Why does my iPhone say “Charging On Hold”?
This usually means temperature protection is working.
On supported versions of iOS, charging can pause when the iPhone is too hot or too cold.
Charging should resume automatically
Once the phone returns to an acceptable temperature, charging can continue.
Apple recommends moving an overheated device away from direct sunlight and letting it cool.
Therefore, a Charging On Hold message does not automatically mean the charger or battery has failed.
Why is my Samsung phone overheating?
Samsung lists several common reasons a Galaxy device may become warm.
These include demanding apps, charging, software activity, high refresh rates and hot environments.
Galaxy phones can protect themselves automatically
If temperatures rise too far, Samsung says supported devices may:
- limit screen brightness;
- reduce performance;
- stop charging;
- close running apps;
- restrict some features;
- eventually shut down if necessary.
Those restrictions are designed to allow the phone to cool.
Why is my Google Pixel overheating?
Pixel devices also monitor their temperature and can reduce performance when necessary.
Google provides temperature diagnostics on supported Pixels
On compatible models, users can open Battery diagnostics and review a temperature state.
Possible states include Normal, Warm and Elevated.
Google says an elevated temperature can temporarily reduce performance, charging speed, camera functions and connectivity.
Why is my phone hot near the camera?
The processor and other high-performance components often sit near the upper section of a phone.
Consequently, heat can be more noticeable around the camera area even when the camera itself is not faulty.
Look at what the phone is doing
Warmth near the camera during:
- gaming;
- video recording;
- navigation;
- software setup;
- large downloads;
can be normal.
By contrast, extreme heat in the same area while the phone sits idle deserves further investigation.
Why is my phone overheating and battery draining fast?
Heat and battery drain often appear together because both can result from high power consumption.
Check battery usage first
Look for:
- a power-hungry game;
- navigation running in the background;
- poor mobile signal;
- hotspot use;
- a malfunctioning app;
- high screen brightness;
- heavy camera use.
If one process is responsible for unusually high power consumption, fixing that issue may improve both battery life and temperature.
Can overheating damage the battery?
Repeated or prolonged exposure to excessive heat can accelerate lithium-ion battery ageing.
Apple specifically warns that using or charging iPhone in very hot conditions can permanently reduce battery lifespan.
Thermal protections exist for a reason
Charging pauses, reduced performance and temperature warnings can be inconvenient.
However, they help limit further heat while the phone returns to a safer operating range.
Do not repeatedly try to override those protections.
Should you put an overheating phone in a fridge or freezer?
No.
Rapid cooling is not a sensible troubleshooting method.
Let the phone cool gradually
Move it into a cooler indoor environment and away from sunlight or other heat sources.
Sudden temperature changes can introduce condensation and create another problem.
Likewise, do not place ice directly against the device.
Should you turn an overheating phone off?
If the phone is extremely hot or displaying a temperature warning, switching it off can help reduce the workload while it cools.
At minimum, stop whatever demanding activity is running.
Disconnect it from the charger too
Google and Samsung both advise disconnecting an overheated device from its power source.
Then move the handset somewhere cooler and wait for the temperature to fall before using it again.
How to cool an overheating phone safely
Do this
- Stop demanding apps or games.
- Disconnect the charger.
- Move the phone out of direct sunlight.
- Remove it from a hot car or enclosed space.
- Lock the screen or turn the phone off if necessary.
- Remove a thick case temporarily if it is trapping heat.
- Allow the phone to cool naturally.
Avoid this
- putting the phone in a freezer;
- placing ice directly on it;
- continuing to game while it is overheating;
- repeatedly reconnecting the charger when thermal protection has stopped charging;
- pressing down a screen lifted by a swollen battery.
Why does my phone overheat after a software update?
Temporary heat after a major update can happen while the phone completes background work.
For example, apps may update and the operating system may re-index files.
Give temporary background activity time to finish
If the device settles after several hours, there may be no problem.
However, continued overheating during normal light use should not simply be blamed on the update indefinitely.
Check battery usage, app updates and available system updates.
Why does my phone overheat during video calls?
A video call can use:
- camera;
- microphone;
- display;
- processor;
- Wi-Fi or mobile data;
- speaker or headphones.
Consequently, long calls can generate noticeable heat.
Charging at the same time can add more
If possible, avoid demanding video calls while fast charging in a hot room or direct sunlight.
Reducing screen brightness can also lower the workload slightly.
Why does my phone overheat while using 5G?
Mobile-network activity consumes power.
The effect can become more noticeable when signal conditions are poor or the phone transfers a large amount of data.
5G itself does not automatically mean something is wrong
However, streaming or tethering over a high-speed mobile connection while the screen and processor are also active can increase total power consumption.
If the phone becomes excessively hot, stop the demanding activity and allow it to cool.
Can a faulty charger cause overheating?
Charging equipment deserves attention if unusual heat occurs around the connector, cable or adapter.
Samsung specifically advises against using damaged or malfunctioning chargers and cables.
Check for visible warning signs
Stop using equipment with:
- frayed insulation;
- bent connectors;
- scorch marks;
- loose plugs;
- unusual heat;
- intermittent connections.
A known-good compatible charger is useful when isolating the cause.
Can a damaged charging port make a phone hot?
Potentially.
Samsung advises that overheating around the charging port can be associated with a damaged cable or device connector.
Look for intermittent charging too
If the phone:
- charges only at an angle;
- repeatedly connects and disconnects;
- gets unusually hot around the port;
- has visible corrosion or damage;
stop forcing the cable and have the connector inspected.
When should you get an overheating phone repaired?
Occasional warmth during demanding use is normal.
Persistent abnormal heat is not something to ignore indefinitely.
Arrange further diagnosis if:
- the phone becomes very hot during light use;
- overheating happens repeatedly while idle;
- thermal shutdowns keep occurring;
- charging regularly stops because of heat;
- the phone heats heavily around a damaged charging port;
- battery life has deteriorated dramatically;
- the screen or back is lifting;
- the phone was recently damaged or exposed to liquid.
The underlying cause may involve the battery, charging system or another component.
Why overheating matters when buying a used phone
A used handset can pass a quick visual inspection and still have a thermal problem.
Therefore, buyers should not assess only scratches and screen condition.
Use the phone before paying where possible
Try:
- opening the camera;
- recording a short video;
- checking battery health;
- testing charging;
- using Wi-Fi;
- checking mobile data;
- looking for abnormal heat.
A phone should not become extremely hot after a few minutes of ordinary use.
Overheating matters to refurbishers too
For device businesses, abnormal temperature can indicate a handset that needs further investigation before resale.
However, temperature alone does not identify the faulty component.
Start with a wider device assessment
A professional workflow can review:
- battery condition;
- charging behaviour;
- USB connectivity;
- display;
- cameras;
- audio;
- sensors;
- Wi-Fi and Bluetooth.
This helps determine whether heat appears alongside another functional failure.
How MobiTEST fits into overheating diagnosis
MobiTEST supports structured functional diagnostics across hardware, display, sound, sensors and connectivity.
That makes it useful when a repair shop or refurbisher needs to determine whether an overheating complaint appears alongside another device fault.
MobiTEST does not directly diagnose thermal faults
This distinction is important.
MobiTEST should not be described as measuring internal battery temperature or identifying a failed charging IC.
Instead, it helps teams test the wider handset consistently and identify other failed functions that may support further technical diagnosis.
Why pre- and post-repair testing matters
Suppose a customer brings in a phone that becomes hot around the charging port.
The technician finds physical connector damage and replaces the relevant component.
The repair should not end when charging resumes
Post-repair checks should also confirm appropriate:
- USB connectivity;
- speakers;
- microphones;
- display and touch;
- Wi-Fi;
- Bluetooth;
- sensors.
That helps show the wider device still functions after repair.
How MobiONE supports high-volume device processing
MobiONE brings several stages of device processing into a consistent workflow.
This is particularly useful for refurbishers, recyclers and retailers processing many devices rather than one consumer repair at a time.
A thermal complaint can become a routing decision
For example:
- identify the device;
- record the reported problem;
- perform due-diligence checks where relevant;
- run functional diagnostics;
- route the device for technical inspection;
- complete the repair where viable;
- retest the handset;
- grade it for resale.
That prevents suspicious devices from being returned to sale simply because they power on.
Should a hot used phone be rejected immediately?
Not necessarily.
The context matters.
A warm device may be behaving normally
A phone that has just:
- installed updates;
- restored a backup;
- recorded video;
- run diagnostics;
- charged quickly;
may naturally be warmer than usual.
Instead of rejecting it immediately, allow it to cool and test it under normal conditions.
Repeated abnormal heat is different
If the handset becomes excessively hot again during simple use, it should move into further diagnosis rather than saleable stock.
A quick phone-overheating checklist
If your phone suddenly gets hot
- Stop gaming, video or other demanding activity.
- Disconnect the charger.
- Move the phone away from direct sunlight.
- Let it cool naturally.
- Restart it once temperatures return to normal.
If overheating keeps happening
- Check battery usage for unusually demanding apps.
- Install current app and system updates.
- Test another suitable charger.
- Inspect the charging port.
- Check battery health where available.
Get further help if
- the phone overheats during light use;
- thermal warnings repeatedly appear;
- the phone repeatedly shuts down;
- charging stops frequently because of temperature;
- the battery or housing begins to swell or lift.
Commercial takeaway
A hot phone is a symptom, not a diagnosis.
Sometimes the cause is completely normal: gaming, video, charging, navigation or software setup.
However, repeated overheating during ordinary use deserves closer attention.
For consumers
First remove the obvious heat sources.
Stop demanding apps, unplug the charger and move the phone somewhere cooler.
Then check battery usage, updates, charging equipment and physical condition.
For phone shops and refurbishers
Do not assume every overheating complaint means “replace the battery”.
Instead, document the symptom, inspect the device and test surrounding functions consistently.
MobiTEST supports guided device diagnostics, while MobiONE helps higher-volume businesses build repeatable processing and testing workflows.
If the business is purchasing the handset rather than simply repairing it, MobiCHECK can also support device-status due diligence before money changes hands.
The key principle is simple: understand why the phone is hot before deciding what needs replacing.
A practical example: a used phone that gets hot during testing
A phone shop receives a recent flagship handset as a trade-in.
Externally, it looks excellent. The screen has no cracks, the frame has only light wear and the customer says the battery is “fine”.
The handset becomes warm during intake
Staff run several checks immediately after the phone has restored data and installed updates.
The upper section of the handset feels noticeably warm.
At this stage, rejecting the device as faulty would be premature.
The shop lets the device settle
Staff allow the phone to finish background activity and cool to normal temperature.
Next, they test it again under ordinary conditions.
The temperature remains stable.
Now imagine a different result
The same handset cools, but within five minutes of light use becomes extremely hot again.
Battery percentage also falls rapidly and charging repeatedly slows.
That pattern deserves more investigation.
The workflow prevents a bad buying decision
Rather than immediately grading the handset for resale, the business routes it for battery and hardware assessment.
Functional diagnostics also check the wider device for unrelated faults.
The important lesson is not that every warm phone should be rejected.
Instead, businesses need a process that separates normal temporary heat from repeatable abnormal behaviour.
Frequently asked questions
Common phone overheating questions
Why is my phone overheating?
Common causes include charging, gaming, video recording, navigation, software updates, hotspot use, background apps, poor signal and hot surroundings. Repeated overheating during light use can also indicate a battery, charging or hardware problem.
Why is my phone hot while charging?
Some warmth is normal because charging generates heat. However, stop charging and investigate if the phone becomes excessively hot, charging repeatedly stops, the cable or port looks damaged or the battery begins to swell.
Can overheating damage my phone battery?
Prolonged exposure to excessive heat can accelerate lithium-ion battery ageing. Apple specifically warns that very hot conditions can permanently reduce battery lifespan.
Should I put an overheating phone in the fridge?
No. Move the phone away from heat and let it cool naturally. Rapid temperature changes can introduce condensation and create additional problems.
iPhone, Samsung and Pixel temperature questions
Why does my iPhone say Charging On Hold?
iPhone can pause charging when its temperature becomes too high or too low. Charging should resume once the device returns to a suitable temperature.
Why is my Samsung phone getting hot?
Samsung identifies charging, power-intensive apps, high refresh rates, background activity and hot environments among common causes. Supported Galaxy phones can reduce performance and stop charging if temperatures become excessive.
Can I check the temperature of a Google Pixel?
Supported Pixel phones provide battery diagnostics that can show a device-temperature state such as Normal, Warm or Elevated.
Does MobiTEST diagnose an overheating phone?
MobiTEST supports wider functional diagnostics across hardware, screen, sound, sensors and connectivity. It should not be described as directly diagnosing battery temperature or board-level thermal faults.
References and further reading
- Apple Support — If your iPhone or iPad gets too hot or too cold
- Apple Support — If a Charging On Hold notification appears
- Apple Support — Charge and maintain your iPhone battery
- Samsung UK Support — Why is my Samsung phone overheating or getting hot?
- Samsung UK — Galaxy Battery Charging Tips
- Google Pixel Help — Help keep your Pixel phone from feeling too warm or hot
- Google Pixel Help — Check and understand your Pixel’s temperature
- Google Pixel Help — Understand your Pixel battery
- MobiCode — MobiTEST
- MobiCode — MobiONE
- MobiCode — MobiCHECK