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How do I know if a second-hand electronic device is still functional ?

How do I know if a second-hand electronic device is still functional ?

Before buying a second-hand electronic device, it's important to check its functionality. Here are some steps you can take: visual inspection for physical damage, powering up the device, testing basic functions, checking battery life, connectivity tests, camera and microphone test, speaker and sound quality check, app testing, heat test, and resetting the device. By following these steps, you can make an informed decision about your purchase.