Why Phones Overheat

  • Charging while using intensively (gaming, video calls) — most common cause
  • Direct sunlight — phones are sensitive to ambient heat
  • Running demanding apps (navigation, gaming, video recording) for extended periods
  • A misbehaving background app consuming CPU
  • Case trapping heat — especially thick rubber or wallet cases
  • Old or degraded battery running inefficiently
  • Software update downloading or installing in the background

Immediate Cooling Steps

  1. 1

    Remove the case and stop charging

    A phone case traps heat against the body. Remove it immediately. If charging, unplug — charging generates heat and heat during charging accelerates battery degradation.

  2. 2

    Close all apps and reduce brightness

    Close every app you are not using. Reduce screen brightness to minimum. Turn off WiFi, Bluetooth and mobile data if not needed. Each of these reduces CPU and radio activity and allows the phone to cool.

  3. 3

    Move out of sunlight and turn off if very hot

    Move to shade or indoors. If the phone is uncomfortably hot to touch or shows an overheating warning, turn it off completely for 5–10 minutes. Do not put it in the fridge, freezer or submerge in cold water — rapid temperature changes cause condensation inside the phone which damages electronics.

Preventing Future Overheating

  1. 4

    Do not charge and game simultaneously

    Charging already generates heat. Adding a demanding game or video call on top creates excessive heat that accelerates battery wear. Use the phone while charging for light tasks only, or charge between sessions.

  2. 5

    Check for rogue background apps

    iPhone: Settings → Battery → check which apps are using the most battery in the last 24 hours. An app using unusually high background activity may be the culprit. Delete and reinstall, or disable Background App Refresh for it. Android: Settings → Battery → Battery Usage. Same approach.

  3. 6

    Use a lighter case

    Thin cases with ventilation patterns dissipate heat better than thick rubber or folio cases. For outdoor activities in heat, consider going caseless when battery efficiency and heat management are important.

Overheating damages the battery permanentlyLithium-ion batteries degrade faster at high temperatures. Repeated overheating reduces maximum battery capacity irreversibly. If your phone overheats regularly during normal use, the battery may be old and degraded — battery replacement by Apple or an authorised repair centre is worth considering for phones over 2–3 years old.

Frequently Asked Questions

Yes — a slight warmth during charging is normal. The concern is excessive heat — too hot to comfortably hold, or approaching 45°C+. Wireless (MagSafe) charging generates more heat than wired charging. Using the phone while wirelessly charging is the most heat-intensive combination. For overnight charging, using a lower-wattage charger and not using the phone generates less heat.
Navigation is one of the most demanding tasks for a phone: GPS runs constantly, the screen stays on at full brightness, the map renders continuously, and LTE/5G streams map data. All while often sitting in direct sunlight in a car. This combination taxes all the heat-generating components simultaneously. Use a phone mount that positions the phone out of direct sunlight, lower screen brightness to the minimum readable level, and avoid charging while navigating if the phone runs hot.