For many people, buying a used smartphone seems like a very risky move. After all, who knows what its previous owner did to it? However,buying a second-hand mobile phone is actually reliable, you need to pay attention to the buttons and screen.

OptoFidelity, an organization that conducts automated smartphone test for different companies, had released some interesting data about used phones that some companies have found. According to the statistics, less than 4% of the second-hand mobile phones submitted to OptoFidelity for testing had problems, and OptoFidelity's sample group was very large, reaching 1 million units so the data are reliable.

In addition, OptoFidelity also analyzed the most prone failures when testing these used smartphones. We can see the ratio of various problems through the icons below. In conclusion, the most common problem is the failure of the physical button, and then the problem with the display.

If you think about this result carefully, you will find its deeper meaning. It takes so many presses for the physical buttons to break, and the LED display takes a long time to work before it fails.

OptoFidelity noted that a small percentage of all smartphone failures the company has documented are due to smartphones that never enter to the second-hand market or were repaired before going on a second sale. The company also reminds consumers that the best way to buy a used phone is from a reputable seller, like Best Buy, eBay, and Swappa, a big box store with brick-and-mortar stores.

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