1. Display Functionality
Check for touch response on all areas, dead pixels, discoloration, lines, and brightness uniformity.
2. Display Condition
Inspect for scratches, cracks, burn-in (OLED), pressure marks, or ghost touch issues.
3. Battery Health
Verify battery capacity, charging cycles, fast charging support, and abnormal drain or overheating.
4. Charging Port
Test cable fit, charging stability, fast charging recognition, and data transfer.
5. Speaker (Loudspeaker)
Check sound clarity, distortion, vibration noise, and volume levels.
6. Microphone
Test voice clarity during calls, voice recording, and noise cancellation.
7. Earpiece
Ensure clear call audio without crackling or low volume.
8. Camera (Front & Rear)
Check focus, clarity, dust inside lens, camera shake, portrait mode, and video recording.
9. Flashlight
Verify brightness and camera flash synchronization.
10. Buttons (Power & Volume)
Test click response, firmness, double-press functions, and stuck buttons.
11. Vibration Motor
Confirm vibration strength and consistency for calls and notifications.
12. Sensors
Test proximity sensor, ambient light sensor, accelerometer, gyroscope, compass, and face detection.

🔹 B. Connectivity & Features (6)

13. SIM Network
Check signal strength, call connectivity, SMS, and mobile data.
14. Wi-Fi
Test connection stability, speed, and range.
15. Bluetooth
Pair with headphones/speakers and test audio stability.
16. GPS
Verify accurate and fast location locking.
17. Fingerprint / Face Unlock
Test speed, accuracy, and reliability of biometric security.
18. Hotspot & Tethering
Ensure hotspot works properly and shares internet without drops.

🔹 C. Software & Security (4)
19. IMEI Verification
Confirm IMEI is clean, original, not blocked, and matches the device.
20. iCloud / Google Lock Status
Ensure the device is fully unlocked and no previous account is linked.
21. Operating System Stability
Check for crashes, boot loops, overheating after updates, or lag.
22. Factory Reset & Data Wipe
Confirm device is fully reset, no previous data, accounts, or apps remain.

🔹 D. Cosmetic & Final QC (2)
23. Physical Condition
Inspect body, frame, back panel, camera glass, dents, bends, and paint wear.
(Grade clearly: Like New / Good / Fair)
24. Final Quality Check & Packing
Re-test critical functions, clean device, apply QC seal, and pack safely with invoice & disclaimer.
📌 Final Answer (Clear & Simple)
👉 Repairs & Refurbished mobiles have 24 essential checkpoints
Covering:, Hardware, Connectivity, Software & Security, Cosmetic & Final QC