How to check a used Xiaomi phone

How to check a used Xiaomi phone for faults, where you can check the screen, check the microphone, check the speakers, check the sensors and sensors, and check the cameras.
#xiaomi
@xiaomi

[@aamm7268]

٠٠٠ شكراااااا جزيلاً ااااا لك ٠٠ بالتوفيق ٠٠٠
٠٠ ٠٠ 🌹 💞 👍 ☎️

[@aboaumir]

😘😘

[@user-lv9qp2yk3w]

احسنت❤😊