Quick answer: A phone gets warm when it works hard: charging (especially fast or wireless charging), gaming, video calls, GPS navigation, filming 4K video, or sitting in the sun. That kind of heat is normal and fades within minutes. Heat is a warning sign when the phone is hot while idle, gets hot every time you charge, shows a temperature warning in normal conditions, or the battery is swelling. Stop charging it and have it checked. Our phone repair shop in Eagan tests the battery and charging system for free.
Key takeaways
- Charging plus heavy use at the same time is the most common cause of a hot phone.
- Direct sun and hot cars are the fastest way to trigger a temperature warning and to wear out the battery.
- An aging or swelling battery makes a phone run hotter. Check battery health first.
- A phone that is hot when you are not using it, smells like burning or has a bulging back needs a technician right away.
In this guide
- Normal warm vs. overheating
- 10 reasons your phone gets hot
- How to cool down a hot phone safely
- Why your phone gets hot while charging
- Temperature warnings on iPhone, Samsung and Pixel
- When a hot phone is dangerous
- How to stop your phone overheating
- Repairs that fix overheating (and prices in Eagan)
- FAQs
Normal Warm vs. Overheating
Phones have no fans, so they get rid of heat through the frame and glass. Warm to the touch during heavy use is normal. Too hot to hold comfortably, hot while doing nothing, or hot enough that the phone dims the screen, stops charging or shuts down is overheating. Apple recommends using an iPhone where the air temperature is between 32 and 95 degrees Fahrenheit (0 to 35 C).
10 Reasons Your Phone Gets Hot
- Using it while charging. Charging produces heat on its own. Add gaming, streaming or a video call and heat builds fast.
- Fast or wireless charging. Both produce more heat than slow wired charging, especially in a thick case.
- Sun and hot cars. A phone on a dashboard or a beach towel can overheat within minutes, even when you are not using it.
- Demanding apps. 3D games, 4K video recording, GPS navigation, hotspot and video calls push the processor hard.
- Weak cellular signal. In basements, elevators and rural areas, the phone boosts its radio power to stay connected, which makes heat.
- Background activity. Photo backups, app updates and a stuck app can keep the processor busy. After a major software update, phones also run warm for a day or two while they reindex.
- A thick or insulated case. Rugged and leather cases trap heat, especially while charging.
- An old or cheap charger or cable. Poor-quality chargers can overheat the phone and the port.
- A worn or swelling battery. Aging batteries have higher internal resistance and run hotter. Check it with our guide on how to check iPhone battery health.
- Hardware damage. Water damage, a drop or a short on the board can make the phone hot even when it is idle. This needs a technician.
How to Cool Down a Hot Phone Safely
- Unplug it and stop what you are doing.
- Take it out of the case.
- Move it out of direct sun, into the shade or a cooler room.
- Close heavy apps, and turn on Airplane Mode for a few minutes if the signal is weak.
- Lower screen brightness or turn the screen off.
- Let it cool naturally for 10 to 15 minutes.
Do not put it in the freezer, fridge or cold water. Sudden cold causes condensation inside the phone, which can lead to water damage. Do not point a hair dryer at it on the “cool” setting either; room temperature air and time are enough.
Why Your Phone Gets Hot While Charging
A bit of warmth while charging is normal, especially in the first 30 minutes with a fast charger. It is not normal if the phone gets too hot to hold, if the area around the charging port gets hot, or if the phone gets hot on the charger even when you are not using it. Try a different, good-quality charger and cable, take off the case and charge on a hard surface, not a bed or couch. If the heat is concentrated at the port, stop charging: a damaged or corroded port can overheat. See why won’t my phone charge and water in the charging port for related problems.
Temperature Warnings on iPhone, Samsung and Pixel
| Phone | What you may see | What the phone does |
|---|---|---|
| iPhone | “Charging on Hold” or a “Temperature: iPhone needs to cool down before you can use it” screen | Pauses charging, dims the screen, weakens cellular signal, and may block use until it cools |
| Samsung Galaxy | “Device is overheating” or a notice that charging has paused | Closes apps, limits performance, pauses charging |
| Google Pixel | “Phone is getting warm” or “Phone is too hot” | Limits features and charging; in extreme cases it shuts down |
These warnings protect the battery and the internal parts. Follow the cool-down steps above and wait for the warning to disappear on its own.
When a Hot Phone Is Dangerous
Stop using and charging the phone, keep it away from anything flammable and get it checked if:
- The back is bulging, the screen is lifting from the frame, or the phone rocks on a flat table. That is a swollen battery.
- You smell something sweet, chemical or burning.
- The phone is hot when it is idle or turned off.
- It gets hot within minutes of every charge.
- It shuts down from heat in normal room temperature.
A swollen battery can also push on the screen and create a bright spot on the display. Do not press on it or try to remove it yourself.
How to Stop Your Phone From Overheating
- Avoid gaming, streaming or video calls while fast charging.
- Keep the phone out of direct sun and never leave it on the dashboard.
- Use the charger that came with your phone or a reputable brand rated for it.
- Take off thick cases while charging.
- Keep your software and apps updated, and remove apps that drain the battery (check Settings > Battery).
- Replace the battery when its health drops to about 80%.
For iPhone 13 owners, our dedicated guide on iPhone 13 overheating issues covers model-specific causes.
Repairs That Fix Overheating (and Prices in Eagan)
If the cause is hardware, one of these repairs usually fixes it. The diagnosis is free with any repair, and we tell you the cause and the price before any work.
| Cause | Repair | Price at Helpertech Eagan |
|---|---|---|
| Worn or swelling iPhone battery | iPhone battery replacement | $100 to $175 depending on model |
| Worn Samsung Galaxy S-series battery | Samsung battery replacement | $142 to $147 |
| Damaged or corroded charging port | Charging port repair | iPhone $119 to $220; Samsung S-series $138 to $143 |
| Water damage or board short | Water damage repair or micro-soldering | Quote after free diagnosis with any repair |
Prices are from our repair pricing page, with a 90-day warranty on every repair. Most iPhone battery replacements in Eagan take under an hour. For iPhones, our iPhone repair in Eagan page covers every repair we do.
Related phone repair guides
Frequently Asked Questions
Why is my phone hot when I am not using it?
Background activity such as photo backups, app updates or a stuck app can keep the processor busy. A weak signal or recent software update can also cause it. If the phone stays hot while idle for more than a day, or after a restart, the battery or board may be faulty and should be checked.
Is it normal for my phone to get hot while charging?
Some warmth is normal, especially with fast or wireless charging. It is not normal if the phone becomes too hot to hold, the port gets hot, or it heats up on the charger without being used. Try another charger and cable, remove the case and charge on a hard surface.
Can overheating damage my phone?
Yes. Repeated heat wears out the battery faster, can cause it to swell, and can weaken screen adhesives and water seals. That is why phones pause charging and limit performance when they get too hot.
Should I put my hot phone in the fridge?
No. Rapid cooling can cause condensation inside the phone, which leads to water damage. Unplug it, remove the case, move it into the shade and let it cool naturally for 10 to 15 minutes.
Can a bad battery make my phone overheat?
Yes. An old or damaged battery has higher internal resistance and gets hotter, especially while charging. If your battery health is around 80% or lower, or the battery is swelling, replace it. iPhone batteries cost $100 to $175 at Helpertech in Eagan.
When is a hot phone dangerous?
If the phone is bulging, the screen is lifting, you smell burning, or it is hot while turned off, stop charging it immediately and keep it away from anything flammable. Bring it to a repair shop to have the battery checked and replaced safely.
Phone Running Hot? Get a Free Battery Check in Eagan
Bring your phone to Helpertech at 2040 Cliff Rd #103, Eagan, MN 55122. We test the battery, charging port and charging system for free and tell you exactly what is causing the heat. Most battery replacements take under an hour, with a 90-day warranty.
About the author: This guide was written by the Helpertech repair team, the technicians at our Eagan phone repair shop at 2040 Cliff Rd #103. Helpertech has been repairing phones, tablets and computers in the Twin Cities since 1995. Prices were checked against our repair pricing page in September 2026.
