How to Fix a Phone That Overheats While Not in Use

Published 2026-10-16 · Marion Phone Repair

You pick up your phone from the table and it is noticeably warm or even hot — but you have not been using it. The phone is just sitting there, not charging, not running games, and yet the back of the phone is warm to the touch. Overheating while idle drains the battery quickly and can be a sign that something is running in the background that should not be. This problem is caused by a rogue app, a stuck background process, a software bug, malware, or a hardware issue with the battery.

Check what is running in the background

Android

1. Settings, Battery, Battery Usage — this shows which apps have consumed the most battery since the last charge. If an app you have not used is at the top of the list with high usage, it is running excessively in the background and generating heat
2. Settings, Apps — tap the app that is using too much battery, then Force Stop. This immediately kills the app and all its background processes
3. Check Settings, Developer Options, Running Services (if Developer Options are enabled) to see which apps have active background processes right now. An app with multiple running services that you are not actively using is a suspect

iPhone

1. Settings, Battery — scroll down to see battery usage by app over the last 24 hours or 10 days. The column shows both on-screen time and background activity time. If an app has significant background activity time but you have not opened it, it is running excessively
2. Force close the suspect app: swipe up from the bottom of the screen (or double-click the Home button on older iPhones) to see the app switcher, then swipe the app up to close it

Restart the phone

A stuck process or service that is consuming CPU in the background will generate heat continuously. A restart kills all processes and gives you a clean state:

• Power off the phone completely (not just restart). Wait 30 seconds, then power it back on
• After the restart, do not open any apps. Leave the phone on a table for 15 to 20 minutes and check if it stays cool. If it does, a stuck process was the cause and the restart fixed it
• If the phone gets warm again within minutes of restarting without you opening any apps, a persistent background process or system-level issue is the cause

Check for app problems

Recently installed or updated apps

• Think about when the overheating started. Did it begin after installing a new app or after an app update? Buggy app updates are a very common cause of background CPU usage and overheating
• Uninstall the most recently installed apps one at a time and monitor the phone temperature after each removal. If the overheating stops after removing a specific app, that app was the cause
• Check for app updates: open the Google Play Store or Apple App Store and update all apps. A known bug causing overheating may already be fixed in a newer version

Social media and messaging apps

• Facebook, Instagram, TikTok, Snapchat, WhatsApp, and Messenger are known for aggressive background activity. They refresh content, download media, sync messages, and maintain persistent connections that use CPU and generate heat
• On Android: Settings, Apps, select the app, Battery — set to Restricted to limit its background activity. On iPhone: Settings, General, Background App Refresh — turn off background refresh for specific apps

Location services

• Apps that constantly track your location in the background (navigation apps, fitness trackers, weather apps, social media) keep the GPS radio active, which generates significant heat
• Android: Settings, Location, App Permissions — change apps from Allow All The Time to Allow Only While Using. This prevents them from using GPS in the background
• iPhone: Settings, Privacy and Security, Location Services — change apps from Always to While Using. Also check for apps showing the purple location arrow in the status bar — this means an app is actively using GPS right now

Check for malware (Android)

• Malware running on Android phones can mine cryptocurrency, send spam, or communicate with remote servers in the background — all of which consume CPU and cause persistent overheating
• Run a scan with Google Play Protect: open Google Play Store, tap your profile icon, Play Protect, Scan. This checks all installed apps for known malware
• Install Malwarebytes (free) from the Play Store for a second opinion scan. Malwarebytes is particularly good at finding adware and PUPs that run background services
• Check your installed apps list for anything you do not recognize. Malware sometimes installs with a generic name and icon. If you find an unfamiliar app that you did not install, uninstall it immediately

Reduce background activity

Android

1. Settings, Battery, Adaptive Battery — make sure this is enabled. It learns your usage patterns and restricts apps you rarely use from running in the background
2. Settings, Apps — for each app you do not need running in the background, tap the app, Battery, select Restricted. This aggressively limits the app's background processes
3. Disable sync for accounts you do not need constantly updated: Settings, Accounts — tap each account and disable auto-sync for services you check manually (social media, forums, newsletters)

iPhone

1. Settings, General, Background App Refresh — turn this off entirely or select Wi-Fi Only if you want some background refresh but with less impact
2. Settings, Mail, Accounts, Fetch New Data — change from Push to Fetch every 15 or 30 minutes, or Manual. Push email keeps a constant connection open that uses CPU and radio
3. Disable unnecessary notifications: Settings, Notifications — turn off notifications for apps that do not need them. Each notification wake-up cycle uses CPU

Software updates

• Install any pending operating system updates. Overheating bugs in Android or iOS are sometimes fixed in patches. Settings, System, Software Update (Android) or Settings, General, Software Update (iPhone)
• After a major OS update, the phone may run hot for 24 to 48 hours while it re-indexes files, optimizes apps, and completes background migration tasks. This is normal and temporary. If the heat continues after 48 hours, the update may have introduced a bug

Check for battery problems

• A degraded battery can generate excess heat even during normal operation. Batteries lose capacity over time — after 2 to 3 years or 500 to 800 charge cycles, battery health drops significantly
• iPhone: Settings, Battery, Battery Health and Charging — check Maximum Capacity. Below 80 percent means the battery is significantly degraded. Apple recommends replacement at this point
• Android: Some Android phones show battery health in Settings, Battery, Battery Health. Samsung phones: Settings, Battery and Device Care, Battery, tap the battery info for cycle count and health percentage. If your phone does not show battery health, install AccuBattery from the Play Store for an estimate
• A swollen battery (the phone feels thicker than normal, the screen has a slight bulge, or the back cover is pushing out) is dangerous and needs immediate replacement. A swollen battery can catch fire. Stop using the phone and bring it to a repair shop

Environmental factors

• Direct sunlight heats the phone even when it is idle. A phone sitting on a car dashboard in the sun can reach dangerous temperatures. Move the phone to shade or a cool surface
• Thick phone cases trap heat. If the phone overheats consistently, try removing the case to see if temperatures improve. Some cases (especially leather and rubber) insulate the phone and prevent heat dissipation
• Charging generates heat normally, but if the phone gets excessively hot while charging, the charger or cable may be damaged. Use the original charger or a reputable third-party charger with the correct voltage and amperage for your phone

Overheating repair in Marion

If your phone overheats while not in use and the troubleshooting above did not fix it, Marion Phone Repair can diagnose whether the cause is a rogue app, a software problem, a degraded battery, or a hardware fault, and repair or replace the failing component to stop the overheating.