Buying an used phone is a popular choice for many users because of its reasonable price. However, used devices also have many potential risks, especially the risk of being installed with spyware or malware. This is an increasingly sophisticated threat that can secretly track, steal personal data, or take control of a device that the user is not aware of.
According to Tom Evans, a cybersecurity expert at cyberDefence mobile security company (UK), used phones are easily pre-loaded with malware because sellers can root their devices, change the operating system or install third-party applications of unknown origin.
Its difficult for unprofessional users to detect any unusual signs if they dont know how to check, Evans warned.
Signs that your phone may be infected with malware
Some typical symptoms include:
- An unusual heater or a battery runs out quickly even if not used much.
- Mobile data or Wi-Fi works continuously, even when the application is not open.
- A strange application appears, untained but still available on the screen.
- Strange notification, pop-up advertisement, or device self- download to unknown apps.
How to detect and handle
Check the application list: Go to Settings > Applications to see if there is any strange software. If you are in doubt, search for the app's name on Google to verify.
Use reputable security software: Use apps like Malwarebytes, Avast Mobile Security or Kaspersky Mobile to scan and detect malware.
Restore the original settings: If you suspect your device is infected with malware deep in the system, you should factory reset and only reinstall it from official sources such as Google Play.
Update operating system: Old devices are often no longer supported for updates. If the system software is too outdated, the security risk will increase.
Mr. Tom Evans recommends avoiding buying floating used phones, especially rooted or jailbreak devices. If necessary, reset everything and check periodically with specialized security tools.
Being vigilant against malware not only protects the device, but also helps keep personal data, bank accounts and sensitive information of users safe.
