UK smartphone users are being placed on high alert for the next 48 hours as a rare May heatwave sweeps across the nation, with temperatures expected to soar above 34 degrees Celsius in some areas. While the hot weather is ideal for outdoor activities, it poses significant risks to electronic devices, particularly iPhones and Android handsets.
Why Heat Is Dangerous for Smartphones
When smartphones become excessively hot, they can experience a range of issues, including reduced battery life, performance throttling, and even complete shutdown. Apple has warned that high ambient temperatures are among the greatest threats to long-term battery health. If a device exceeds a certain temperature threshold, it will display a warning screen stating: "Temperature! iPhone needs to cool down before you can use it." Permanent damage is also possible if overheating persists.
Expert Advice from Uswitch
To mitigate these risks, the team at Uswitch.com has issued crucial advice for smartphone owners during the heatwave. Key recommendations include keeping phones out of direct sunlight and avoiding leaving them in hot cars. "Direct sunlight and hot cars are a smartphone's worst enemies," Uswitch explained. "A device left on a sunny dashboard or windowsill can hit dangerous temperatures within minutes. When you're outside, keep your phone in a bag or shaded pocket rather than leaving it exposed."
Additionally, users are advised to charge their devices only during cooler parts of the day, as charging generates its own heat and can push temperatures to dangerous levels. Turning down screen brightness and disabling power-hungry settings can also help reduce heat buildup. Another simple tip is to remove thick cases, which can trap heat. "Thick silicone or leather cases are designed to protect your phone, but they also trap heat," Uswitch added. "Removing the case on the hottest days gives your device a little extra ventilation – just be careful where you set it down without that protection."
Recognising Overheating Signs
Simrat Sharma, mobiles expert at Uswitch.com, emphasised the importance of proactive measures. "Small changes make a big difference. Removing your case, dimming the screen and keeping your phone out of direct sunlight are all easy wins," Sharma said. "Most people don't think twice about leaving their phone on a sunny table all afternoon, snapping away on the camera, or keeping it in a tight pocket all day – but those habits can do real, lasting damage to the battery. The risk rises quickly once temperatures hit 30°C, and your phone is sitting in direct sunlight."
If a device feels uncomfortably warm to the touch, the best course of action is to switch it off and place it in a cool, shaded area for a few minutes. If overheating occurs regularly even in normal temperatures, it may be advisable to have the device inspected by a professional.
